Re: Is 275GB of VDISK stupid?
On Dec 3, 2007 7:13 AM, Leland Lucius [EMAIL PROTECTED] wrote: But, I like a little excitement every so often, so I got this crazy idea to replace all secondary swap with VDISK and just boost up the VM paging volumes. That seems like a good idea to me. But what else can I say, since we have been promoting this for a while. As long as a VDISK does not get used, the cost is neglectable. When you set up proper monitoring to detect when it gets used, you could get away with less than the maximum amount of paging space for VM. We don't actually hit Linux swap all that much so probably 15% or so of that 275GB is ever really in use. (Yes, I know...we're probably oversizing our guests, but that's a different story.) I know I'd have go boost up the number of paging volumes, but does VM have to map all of that storage even if it doesn't get used? You need to provide enough z/VM paging space for what is being used. And we say ideally a factor 2 over that to allow for efficient paging. If you have 15% of the 275G in use at 50% full, then one or two servers misbehaving would not yet cause you too much trouble. But do monitor it. If you don't monitor you must provide space for what might possibly get used (which is 6 times as much in your case). Because of the Linux algorithm for using swap, a VDISK used for swap even a little will eventually be used completely. So you need to prepare for all of these disks to end up in z/VM paging space. If you see z/VM page in your VDISK on a constant basis, you should look at making the VDISK smaller. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/
Jeff Beck is out of the office.
I will be out of the office starting 12/03/2007 and will not return until 12/05/2007. I will be out of the office Monday 12/3 and will return Wednesday 12/5. I will be checking email and vocie messages daily and will respond by COB 12/5. Thank you.
Re: Is 275GB of VDISK stupid?
It seems hasty to say that Because of the Linux algorithm for using swap, a VDISK used for swap even a little will eventually be used completely. That's the same as saying a linux swap area used even a little will eventually be used completely. Why would linux do that? That's not what my SLES9 guests do. Now that the swap topic's open again: What is the basis for advising z/VM VDISK users to have a hierarchy of multiple linux swap areas of increasing sizes? Are there feature(s) of the swapping algorithm that make that hierarchy principle optimal? This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Rob van der Heij Sent: Monday, December 03, 2007 3:56 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Is 275GB of VDISK stupid? snip Because of the Linux algorithm for using swap, a VDISK used for swap even a little will eventually be used completely. So you need to prepare for all of these disks to end up in z/VM paging space. If you see z/VM page in your VDISK on a constant basis, you should look at making the VDISK smaller. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/
Re: Is 275GB of VDISK stupid?
On Dec 3, 2007 2:43 PM, Romanowski, John (OFT) [EMAIL PROTECTED] wrote: It seems hasty to say that Because of the Linux algorithm for using swap, a VDISK used for swap even a little will eventually be used completely. That's the same as saying a linux swap area used even a little will eventually be used completely. Why would linux do that? That's not what my SLES9 guests do. Maybe our idea of eventually is different. ;-) But yes, in order to optimize the Linux I/O (reduce seek times, allow I/O's to be merged, etc) Linux prefers to pick a virgin pages in the VDISK rather than ones that have been freed by swap-in. In the view of z/VM, the freed pages are still used because there is something in them and Linux has not told VM can forget it. So with some amount of swapping going on, eventually all pages of the VDISK have been used and VM views them as in-use, even though Linux still has only a small amount of pages swapped out. If your performance monitor shows use - linux number of swapped pages - vdisk number of resident pages - vdisk paging rates then it becomes very clear that this is happening. Now that the swap topic's open again: What is the basis for advising z/VM VDISK users to have a hierarchy of multiple linux swap areas of increasing sizes? Are there feature(s) of the swapping algorithm that make that hierarchy principle optimal? Exactly the thing above. When you have one big VDISK and the oldest frames get paged out by VM, every page that Linux selects for swap-out will first require a page-in by z/VM (useless, because Linux does not need that data). Ideally you want your top swap disk to be large enough that it does not overflow even when Linux needs most memory. And small enough that it remains resident on z/VM. If there's different levels of utilization in Linux during the day, you may need multiple levels of VDISK to fit those requirements. At the beginning of such a level of high resource requirements you will find z/VM page in the VDISK, but then it remains resident during the period of high usage. The idea with the stack of VDISKs in different size (and with different swap priority) is to get started when you have no clue about the requirements. When you have measured, you can probably come up with something smarter. Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/
HCD question
I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance...Chris
Re: z/VM Installation from DVD
Oreos and Coca-Cola. -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Thomas Kern Sent: December 2, 2007 22:35 To: IBMVM@LISTSERV.UARK.EDU Subject: Re: z/VM Installation from DVD Chocolate helps a lot. Alot of chocolate help. /Tom Kern Adam Thornton wrote: On Dec 2, 2007, at 9:23 PM, Alan Altmark wrote: Man does not live by minidisk alone. That's true. If you want to run z/VM, you need some bread. If you want to run z/OS, you need a whole lotta bread. Adam The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner.
Re: HCD question
I do not have personal knowledge of this, but I believe the answer is a resounding YES. In fact, attempting to use both z/OS HCD and z/VM HCD on the same box could result in major grief. Choose one, and stick to it. Peter -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Hilliard, Chris Sent: December 3, 2007 10:06 To: IBMVM@LISTSERV.UARK.EDU Subject: HCD question I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance...Chris The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner.
Re: HCD question
I use z/os HCD to maintain both z/os(three lpars) and z/vm (an IFL). We share DASD and I just mark the dasd that z/vm uses as reachable for that partition. The only other thing that is different for us is we mark WLMPAV as NO (where z/os has YES). Hope that helps! From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, December 03, 2007 10:10 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: HCD question I do not have personal knowledge of this, but I believe the answer is a resounding YES. In fact, attempting to use both z/OS HCD and z/VM HCD on the same box could result in major grief. Choose one, and stick to it. Peter -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Hilliard, Chris Sent: December 3, 2007 10:06 To: IBMVM@LISTSERV.UARK.EDU Subject: HCD question I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance...Chris The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner.
Re: HCD question
You should be able to use z/OS's HCD to create the IOCDS for z/VM. I
believe you will need to send the files to VM and use the IOCP routine
to write it out to the SE
I use this code to compile and write out the IOCDS source file
/***/
/* 'IOCP RAPTORA0 ( ICP WRTA0 DYN DESC1 RAPTORA0 DESC2' TODAY */
/***/
TRUE = (1=1)
FALSE= \TRUE
WRITE_IT = TRUE
TODAY= DATE('S')
IO_NAME = 'RAPTOR'
IO_TYPE = 'A2'
IOCP_FN = IO_NAME||IO_TYPE
IO_OPT1 = 'ICP '
IO_OPT2 = 'DYN DESC1' IOCP_FN 'DESC2' TODAY
SAY;SAY;SAY 'BUILDING IOCP FILE' IOCP_FN TODAY '. . .'
IF WRITE_IT THEN DO
'IOCP' IOCP_FN '(' IO_OPT1 'WRT'||IO_TYPE IO_OPT2
END
ELSE DO
'IOCP' IOCP_FN '(' IO_OPT1 'NOWRT' IO_OPT2
END
EXIT
Larry
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Hilliard, Chris
Sent: Monday, December 03, 2007 10:06 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: HCD question
I'm currently installing z/VM 5.3. I have two other LPARs on this box
running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or
permanently) my hardware/software configuration for the z/VM LPAR using
HCD under z/OS? I have a huge learning curve ahead of me and not having
to learn z/VM's HCD would lighten my load a bit.
Any words of wisdom from the community?
Thanks in advance...Chris
Re: HCD question
Hi, Chris. Absolutely yes...stay with z/OS HCD to manage your hardware/software configurations for both z/OS and z/VM LPARs. z/VM ships it's own version of HCD only because some sites installing it might not already have z/OS available. z/VM is quite happy having z/OS's HCD manage it's resources. Hilliard, Chris wrote: I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance...Chris -- DJ V/Soft z/VM and mainframe Linux expertise, training, consulting, and software development www.vsoft-software.com
Re: HCD question
Sure. I've done that in the past with NO problem. You need an LPAR defination, but not an OS defination. Define the LPAR as being an OS LPAR, not a CF LPAR. You don't need an OS defination because z/VM doesn't use that. The OS defination only contains z/OS information like the EDT. z/VM will get its information dynamically when you IPL it, so it doesn't need anything like the UCB stuff in the OS defination that z/OS does. -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Hilliard, Chris Sent: Monday, December 03, 2007 9:06 AM To: IBMVM@LISTSERV.UARK.EDU Subject: HCD question I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance...Chris
Re: Is 275GB of VDISK stupid?
On 12/3/07 2:55 AM, Rob van der Heij [EMAIL PROTECTED]
wrote:
Because of the Linux algorithm for using swap, a VDISK used for swap
even a little will eventually be used completely.
I realize that VDISK is special in the world of Linux, but why doesn't
someone give us the option of preventing this? Looks to me like adding one
line in swapfile.c would allow pages to cluster at the beginning of a disk
instead of running to the end and starting over at the beginning.
si-flags += SWP_SCANNING;
---goto lowest;
if (unlikely(!si-cluster_nr)) {
So, just make this a configurable option via procfs and let us decide. :-)
Leland
Re: Is 275GB of VDISK stupid?
Leland,
If you're looking at code for that swapping algorithm:
what happens when highest priority swap area (swap1) gets to the end,
swap1 has free slots and the next higher priority swap area (swap2) has
free clusters?
Does linux start over at the beginning of swap1 and fill swap1 before
allocating from swap2?
This e-mail, including any attachments, may be confidential, privileged or
otherwise legally protected. It is intended only for the addressee. If you
received this e-mail in error or from someone who was not authorized to send it
to you, do not disseminate, copy or otherwise use this e-mail or its
attachments. Please notify the sender immediately by reply e-mail and delete
the e-mail from your system.
-Original Message-
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Leland Lucius
Sent: Monday, December 03, 2007 10:26 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Is 275GB of VDISK stupid?
On 12/3/07 2:55 AM, Rob van der Heij [EMAIL PROTECTED]
wrote:
Because of the Linux algorithm for using swap, a VDISK used for swap
even a little will eventually be used completely.
I realize that VDISK is special in the world of Linux, but why doesn't
someone give us the option of preventing this? Looks to me like adding
one
line in swapfile.c would allow pages to cluster at the beginning of a
disk
instead of running to the end and starting over at the beginning.
si-flags += SWP_SCANNING;
---goto lowest;
if (unlikely(!si-cluster_nr)) {
So, just make this a configurable option via procfs and let us decide.
:-)
Leland
Re: HCD question
Our I/O configuration is done completely via z/OS. The only downside I can see to it is that z/VM can¹t dynamically add devices, since it has no access to the source. -- .~.Robert P. Nix Mayo Foundation /V\RO-OE-5-55 200 First Street SW / ( ) \ 507-284-0844 Rochester, MN 55905 ^^-^^ - In theory, theory and practice are the same, but ³Join the story... Ride Ural.² in practice, theory and practice are different. On 12/3/07 9:09 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I do not have personal knowledge of this, but I believe the answer is a resounding YES. In fact, attempting to use both z/OS HCD and z/VM HCD on the same box could result in major grief. Choose one, and stick to it. Peter -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Hilliard, Chris Sent: December 3, 2007 10:06 To: IBMVM@LISTSERV.UARK.EDU Subject: HCD question I¹m currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM¹s HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advanceChris The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner.
Re: Is 275GB of VDISK stupid?
On Dec 3, 2007 4:25 PM, Leland Lucius [EMAIL PROTECTED] wrote: I realize that VDISK is special in the world of Linux, but why doesn't someone give us the option of preventing this? Looks to me like adding one line in swapfile.c would allow pages to cluster at the beginning of a disk instead of running to the end and starting over at the beginning. It's may not be a good idea to do sequential scanning of swap slots, but a push down stack of free slots might be cute. An even better alternative that we discussed on linux-390 is to have a facility to make Linux tell VM to drop the page from disk (makes also sense for COW devices). But this is chicken egg: there's nothing now and if you make it, there's nothing that uses it... Some restrictions that Linux puts on I/O requests are self-imposed and not all necessary on ECKD, and certainly not on VDISK. But again, changes to the main kernel sources just for one architecture will not come easily. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/
Re: Is 275GB of VDISK stupid?
On Dec 3, 2007 4:51 PM, Romanowski, John (OFT) [EMAIL PROTECTED] wrote: Leland, If you're looking at code for that swapping algorithm: what happens when highest priority swap area (swap1) gets to the end, swap1 has free slots and the next higher priority swap area (swap2) has free clusters? Does linux start over at the beginning of swap1 and fill swap1 before allocating from swap2? That's the point of priority of the swap device. You make Linux re-use swap1 before spilling to swap2. Note that Linux will not migrate back from swap2 to swap1 when stuff is freed later. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/
Re: FTP Append (Update)
I was thinking that the SRVRFTPO CONFIG version of TIMESTAMP might actually apply to the FTPSERVE LOG file. I already use TERM TIMPSTMP ON for the console messages, so the question still stands. Is the documentation wrong (TIMESTAMP ON does not appear to be the default, as stated), or is there a program bug? Which do I report? While on the subject of the log files, they would be much handier if they were made date-specific. If the file type were the current date, perhaps Rexx date(S) format, instead of that totally uninformative LOG, it would make life much easier for me and, I suspect, for many others. This applies to all of those perpetually growing log files that seem assume that they have an infinitely large disk to use and try to use every bit of it. Regards, Richard Schuh -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Alan Altmark Sent: Sunday, December 02, 2007 7:05 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: FTP Append (Update) On Friday, 11/30/2007 at 06:45 EST, Schuh, Richard [EMAIL PROTECTED] wrote: There is no SRVRFTP CONFIG file, so everything about FTP is vanilla. The manual says that the default is TIMESTAMP ON. I have 30,000 lines of empirical evidence that this is not so. Do I report this as a program bug or is it a documentation problem? TIMESTAMP applies to actual FTP server messages, not to anonymous, uh, e-drivel the server puts on the console. I'd use CP TERMINAL TIMESTAMP ON instead. Alan Altmark z/VM Development IBM Endicott
Re: HCD question
It has always been the case that for a given system (e.g. z9), there is one and only one LPAR that should place the IOCP online; and only one LPAR that should be doing dynamic IOCP changes. This is somehow enforced by that tokens are used, and when z/OS is the master, a VM LPAR can no longer do dynamic changes. This is not related to z/VM having access to the IOCP source or not. As fa as I know, HCP can even create IOCPs for other systems than the LPAR it runs on; in that case, it is useful to ship the IOCP source created by HCD to a VM on another system and use the IOCP command to place it online there. 2007/12/3, RPN01 [EMAIL PROTECTED]: Our I/O configuration is done completely via z/OS. The only downside I can see to it is that z/VM can't dynamically add devices, since it has no access to the source. -- .~.Robert P. Nix Mayo Foundation /V\RO-OE-5-55 200 First Street SW / ( ) \ 507-284-0844 Rochester, MN 55905 ^^-^^ - In theory, theory and practice are the same, but Join the story... Ride Ural. in practice, theory and practice are different. On 12/3/07 9:09 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I do not have personal knowledge of this, but I believe the answer is a resounding YES. In fact, attempting to use both z/OS HCD and z/VM HCD on the same box could result in major grief. Choose one, and stick to it. Peter -Original Message- *From:* The IBM z/VM Operating System [mailto:[EMAIL PROTECTED][EMAIL PROTECTED] *On Behalf Of *Hilliard, Chris *Sent:* December 3, 2007 10:06 *To:* IBMVM@LISTSERV.UARK.EDU *Subject:* HCD question I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance…Chris -- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner. -- Kris Buelens, IBM Belgium, VM customer support
Re: HCD question
I have a special situation here where the z/VM system is a separate box then the z/OS system which requires the files to be sent to me and I build them on the VM system. From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Kris Buelens Sent: Monday, December 03, 2007 12:19 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: HCD question It has always been the case that for a given system (e.g. z9), there is one and only one LPAR that should place the IOCP online; and only one LPAR that should be doing dynamic IOCP changes. This is somehow enforced by that tokens are used, and when z/OS is the master, a VM LPAR can no longer do dynamic changes. This is not related to z/VM having access to the IOCP source or not. As fa as I know, HCP can even create IOCPs for other systems than the LPAR it runs on; in that case, it is useful to ship the IOCP source created by HCD to a VM on another system and use the IOCP command to place it online there. 2007/12/3, RPN01 [EMAIL PROTECTED]: Our I/O configuration is done completely via z/OS. The only downside I can see to it is that z/VM can't dynamically add devices, since it has no access to the source. -- .~.Robert P. Nix Mayo Foundation /V\RO-OE-5-55 200 First Street SW / ( ) \ 507-284-0844 Rochester, MN 55905 ^^-^^ - In theory, theory and practice are the same, but Join the story... Ride Ural. in practice, theory and practice are different. On 12/3/07 9:09 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: I do not have personal knowledge of this, but I believe the answer is a resounding YES. In fact, attempting to use both z/OS HCD and z/VM HCD on the same box could result in major grief. Choose one, and stick to it. Peter -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] On Behalf Of Hilliard, Chris Sent: December 3, 2007 10:06 To: IBMVM@LISTSERV.UARK.EDU Subject: HCD question I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS? I have a huge learning curve ahead of me and not having to learn z/VM's HCD would lighten my load a bit. Any words of wisdom from the community? Thanks in advance...Chris The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner. -- Kris Buelens, IBM Belgium, VM customer support
Re: FTP Append (Update)
On Monday, 12/03/2007 at 11:55 EST, Schuh, Richard [EMAIL PROTECTED] wrote: I was thinking that the SRVRFTPO CONFIG version of TIMESTAMP might actually apply to the FTPSERVE LOG file. I already use TERM TIMPSTMP ON for the console messages, so the question still stands. Is the documentation wrong (TIMESTAMP ON does not appear to be the default, as stated), or is there a program bug? Which do I report? Without digging through code, I would guess that the FTP TIMESTAMP ON applies only to *messages*, not the, ummm, e-musings and trace output of the server. If there's a bug, it's that those e-musings are being displayed. While on the subject of the log files, they would be much handier if they were made date-specific. If the file type were the current date, perhaps Rexx date(S) format, instead of that totally uninformative LOG, it would make life much easier for me and, I suspect, for many others. This applies to all of those perpetually growing log files that seem assume that they have an infinitely large disk to use and try to use every bit of it. Again, use the exits we have provided if you want to build a real, live audit trail of what the server is doing. Then you can use SCIF to capture output of your choice and store it the way you want. Alan Altmark z/VM Development IBM Endicott
Re: Is 275GB of VDISK stupid?
Rob said earlier that after linux starts using a lower priority swap area it doesn't migrate back from swap2 to swap1 when stuff is freed later. So do you find after swapoff/on a high priority VDISK that linux starts using it? or does it ignore it and keep filling the dasd swap? This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Brian Nielsen Sent: Monday, December 03, 2007 12:53 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Is 275GB of VDISK stupid? On Mon, 3 Dec 2007 08:43:45 -0500, Romanowski, John (OFT) [EMAIL PROTECTED] wrote: Now that the swap topic's open again: What is the basis for advising z/VM VDISK users to have a hierarchy of multiple linux swap areas of increasing sizes? Are there feature(s) of the swapping algorithm that make that hierarchy principle optimal? The configuration we use includes swap space on real DASD at a lower priority than the VDISK swap areas. Over time Linux will swap more to the real DASD than the VDISKs. At this point doing a swap off and then on of a VDISK swap area frees up the fast VDISK. Having various VDISK sizes allows the flexibility of migrating smaller amounts of swap data during busy periods and larger amounts during slow periods. Brian Nielsen
Re: Is 275GB of VDISK stupid?
On Mon, 3 Dec 2007 08:43:45 -0500, Romanowski, John (OFT) [EMAIL PROTECTED] wrote: Now that the swap topic's open again: What is the basis for advising z/VM VDISK users to have a hierarchy of multiple linux swap areas of increasing sizes? Are there feature(s) of the swapping algorithm that make that hierarchy principle optimal? The configuration we use includes swap space on real DASD at a lower priority than the VDISK swap areas. Over time Linux will swap more to th e real DASD than the VDISKs. At this point doing a swap off and then on of a VDISK swap area frees up the fast VDISK. Having various VDISK sizes allows the flexibility of migrating smaller amounts of swap data during busy periods and larger amounts during slow periods. Brian Nielsen
Re: HCD question
Yes. This is in fact the recommended method, since VM is far, far more tolerant about I/O configuration than z/OS. From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Hilliard, Chris Sent: Monday, December 03, 2007 10:06 AM To: IBMVM@LISTSERV.UARK.EDU Subject: HCD question I'm currently installing z/VM 5.3. I have two other LPARs on this box running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or permanently) my hardware/software configuration for the z/VM LPAR using HCD under z/OS?
Re: Is 275GB of VDISK stupid?
After the swap off/on linux uses that swap area again. I believe what Ro b said/meant is that it doesn't reuse indiviual pages that it otherwise could/should. The swap off/on makes it look brand new by wiping out all prior knowledge . Brian Nielsen On Mon, 3 Dec 2007 13:05:57 -0500, Romanowski, John (OFT) [EMAIL PROTECTED] wrote: Rob said earlier that after linux starts using a lower priority swap area it doesn't migrate back from swap2 to swap1 when stuff is freed later. So do you find after swapoff/on a high priority VDISK that linux starts using it? or does it ignore it and keep filling the dasd swap? This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Brian Nielsen Sent: Monday, December 03, 2007 12:53 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Is 275GB of VDISK stupid? On Mon, 3 Dec 2007 08:43:45 -0500, Romanowski, John (OFT) [EMAIL PROTECTED] wrote: Now that the swap topic's open again: What is the basis for advising z/VM VDISK users to have a hierarchy of multiple linux swap areas of increasing sizes? Are there feature(s) of the swapping algorithm that make that hierarchy principle optimal? The configuration we use includes swap space on real DASD at a lower priority than the VDISK swap areas. Over time Linux will swap more to the real DASD than the VDISKs. At this point doing a swap off and then on of a VDISK swap area frees up the fast VDISK. Having various VDISK sizes allows the flexibility of migrating smaller amounts of swap data during busy periods and larger amounts during slow periods. Brian Nielsen
Re: HCD question
We do all the HCD maintenance from one of the z/OS lpars. You do not
have to send the files to VM. I'm not sure but what that might cause a
problem altho you would be just loading the same set of IO definitions.
VM finds the IO definitions at ipl time. I don't even know if our IOCP
program would run or abend on the VM side, altho I suspect it works. As
someone else said there is no operating system dependencies in the IOCDS
that VM needs or uses. As someone else said, there is the drawback in
not being to directly add a device from VM since the VM lpar is not the
owner of the IOCDS.
Jim
Davis, Larry wrote:
This is a multi-part message in MIME format.
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charset=us-ascii
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You should be able to use z/OS's HCD to create the IOCDS for z/VM. I
believe you will need to send the files to VM and use the IOCP routine
to write it out to the SE
=20
I use this code to compile and write out the IOCDS source file
=20
/***/
/* 'IOCP RAPTORA0 ( ICP WRTA0 DYN DESC1 RAPTORA0 DESC2' TODAY */
/***/
TRUE =3D (1=3D1)
FALSE=3D \TRUE
WRITE_IT =3D TRUE
TODAY=3D DATE('S')
IO_NAME =3D 'RAPTOR'
IO_TYPE =3D 'A2'
IOCP_FN =3D IO_NAME||IO_TYPE
IO_OPT1 =3D 'ICP '
IO_OPT2 =3D 'DYN DESC1' IOCP_FN 'DESC2' TODAY
SAY;SAY;SAY 'BUILDING IOCP FILE' IOCP_FN TODAY '. . .'
IF WRITE_IT THEN DO
'IOCP' IOCP_FN '(' IO_OPT1 'WRT'||IO_TYPE IO_OPT2
END
ELSE DO
'IOCP' IOCP_FN '(' IO_OPT1 'NOWRT' IO_OPT2
END
EXIT
=20
Larry
=20
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Hilliard, Chris
Sent: Monday, December 03, 2007 10:06 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: HCD question
I'm currently installing z/VM 5.3. I have two other LPARs on this box
running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or
permanently) my hardware/software configuration for the z/VM LPAR using
HCD under z/OS? I have a huge learning curve ahead of me and not having
to learn z/VM's HCD would lighten my load a bit.
=20
Any words of wisdom from the community?
=20
Thanks in advance...Chris
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Re: Is 275GB of VDISK stupid?
Leland Lucius wrote:
It sounds like a good idea and since Linux is open source, I suspect
that if you wrote it, Leland, we might use it.
Jim
I realize that VDISK is special in the world of Linux, but why doesn't
someone give us the option of preventing this? Looks to me like adding one
line in swapfile.c would allow pages to cluster at the beginning of a disk
instead of running to the end and starting over at the beginning.
si-flags += SWP_SCANNING;
---goto lowest;
if (unlikely(!si-cluster_nr)) {
So, just make this a configurable option via procfs and let us decide. :-)
Leland
--
Jim Bohnsack
Cornell University
(607) 255-1760
[EMAIL PROTECTED]
Re: Is 275GB of VDISK stupid?
On 12/3/07 12:15 PM, Jim Bohnsack [EMAIL PROTECTED] wrote: Leland Lucius wrote: It sounds like a good idea and since Linux is open source, I suspect that if you wrote it, Leland, we might use it. The option would have to be on a per device basis since we'd still want normal disk to use the ring approach. Unfortunately, I don't see it getting much use unless it were accepted into the main tree since it would require a kernel rebuild. I don't think most shops would care to do this. ;-) Leland
Re: Is 275GB of VDISK stupid?
On Dec 3, 2007 7:16 PM, Brian Nielsen [EMAIL PROTECTED] wrote: The swap off/on makes it look brand new by wiping out all prior knowledge Correct. That forces Linux to migrate pages off that disk. If there's a fair amount of blocks in-use (according to Linux) you will find that it takes some time for the swapoff to complete (while Linux swaps pages back in). Once you've done this, you could vary the disk offline, detach it, and get a new VDISK from VM (and thus let VM free up all those pages). I've actually done this automagically with a workload that was predictable, but I'm not sure it's worth the trouble. It's interesting to see what happens to free when you do this. Part of this magic is in swap cache (pages both in memory and on swap disk, because they were swapped back in but not modified yet). Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/
CP Monitor Records...help
I need to understand how CP monitor records of Domain 6 record 3 are interpreted. I am writing an exec to give us a rough idea of what volumes are doing what. I have used examples from the Redbook website for pieces of code. In my exec I coordinate and save the first and subsequent related records for subtraction to determine the amount of changes that occurred from one record to the next. Where I am getting stuck is with, for exampl e, these fields: IODDEV_SCMCNTIM, IODDEV_SCMFPTIM and IODDEV_SCMFPTIM. I kn ow that I have to convert them to hex from character. Then to decimal from h ex. I don't know how to proceed from here. Are these fields cumulative counts of 128 microsecond 'chunks'? If so how do I get these numbers to the common millisecond format that we all know and love? Any help would be much appreciated! Thanks in advance, Regards, Michael
Re: HCD question
Hello Everyone, Is HCD a chargeable item? It sounds interesting. I have it on the VMSYS but it is not installed. 568411219 HCD/HCM for z/VM 5VMHCD20 0409974 Ed Martin Aultman Health Foundation 330-588-4723 [EMAIL PROTECTED] ext. 40441
Re: HCD question
Hi, Ed. No, HCD is not a chargeable itemit's shipped as part of the base z/VM 5.3 offering and you can start using it straight away. Edward M. Martin wrote: Hello Everyone, Is HCD a chargeable item? It sounds interesting. I have it on the VMSYS but it is not installed. 568411219 HCD/HCM for z/VM 5VMHCD20 0409974 Ed Martin Aultman Health Foundation 330-588-4723 [EMAIL PROTECTED] ext. 40441 -- DJ V/Soft z/VM and mainframe Linux expertise, training, consulting, and software development www.vsoft-software.com
HCD question
Thank you to all that responded to my HCD question. The various responses have been a great help.
Re: HCD question
Hello Dave, Thank you. I have need of it soon. Ed Martin Aultman Health Foundation 330-588-4723 [EMAIL PROTECTED] ext. 40441 -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Dave Jones Sent: Monday, December 03, 2007 2:05 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: HCD question Hi, Ed. No, HCD is not a chargeable itemit's shipped as part of the base z/VM 5.3 offering and you can start using it straight away. Edward M. Martin wrote: Hello Everyone, Is HCD a chargeable item? It sounds interesting. I have it on the VMSYS but it is not installed. 568411219 HCD/HCM for z/VM 5VMHCD20 0409974 Ed Martin Aultman Health Foundation 330-588-4723 [EMAIL PROTECTED] ext. 40441 -- DJ V/Soft z/VM and mainframe Linux expertise, training, consulting, and software development www.vsoft-software.com
Re: Is 275GB of VDISK stupid?
On Mon, Dec 3, 2007 at 1:05 PM, in message [EMAIL PROTECTED], Romanowski, John (OFT) [EMAIL PROTECTED] wrote: Rob said earlier that after linux starts using a lower priority swap area it doesn't migrate back from swap2 to swap1 when stuff is freed later. To be more explicit, if swap1 fills up, then swap2 starts being used. If pages on swap1 get freed up, the pages that were written to swap2 will never be migrated to swap1, even if if they are paged in by Linux and then paged out again. So do you find after swapoff/on a high priority VDISK that linux starts using it? or does it ignore it and keep filling the dasd swap? Yes, but you could force the same behavior by doing a swapoff/swapon on the lower priority disk. Since there are (presumably the reason why you did this) free pages on the VDISK, they'll be used first. Mark Post
Re: Is 275GB of VDISK stupid?
On Mon, Dec 3, 2007 at 1:43 PM, in message [EMAIL PROTECTED], Leland Lucius [EMAIL PROTECTED] wrote: On 12/3/07 12:15 PM, Jim Bohnsack [EMAIL PROTECTED] wrote: Leland Lucius wrote: It sounds like a good idea and since Linux is open source, I suspect that if you wrote it, Leland, we might use it. The option would have to be on a per device basis since we'd still want normal disk to use the ring approach. Unfortunately, I don't see it getting much use unless it were accepted into the main tree since it would require a kernel rebuild. I don't think most shops would care to do this. ;-) If the patch was written in such a way to only affect s390 (and didn't introduce its own performance problems), you might have a shot at getting it accepted into the official source. That route is now pretty available, what with the git390 server out there. (Even if you don't use it, just submit the patch and see where it goes.) Mark Post
Tues, Dec 4 - Linux on System z Security - Live Virtual Class
Just a reminder that the next Linux on System z Live Virtual Class is Tuesday, Dec 4th at 11:00 AM ET. There is no charge to participate in these technical education sessions. Date: Tuesday, December 4, 2007 Time: 11:00 AM ET U.S. Canada / 5:00 PM GMT Duration: 75 minutes Topic: Linux on System z Security Presenter: Peter Spera, IBM Linux on System z Design and System Integrity Competency Center. Abstract: This presentation will cover a broad range of security topic relevant to enterprise deployments of Linux on System z. Vendor and open source offerings will be touched on, as well as some typical deployments including a DMZ. Also, options for hardware cryptography utilization will be explored in detail. Connect/Listen the Replay to the Live Virtual Class (LVC) session using the following URL: https://asp22.centra.com:443/GA/main/005d3ac0011610802ba78f11 You can connect to the LVC session up to 15 minutes prior to the start of the session. (Connecting using Centra during the live LVC allows you the option of asking questions.) OR If you are unable to connect to the Live Virtual Class session, you can listen to the audio portion of the Linux session via telephone using the following: Phone Number 1: 1-888-240-4148 Phone Number 2: 1-719-234-0214 Access Code: 736296 Note: use of the telephone connection does not provide capability for you to ask questions during the session. System Check The LVC will be delivered using the Centra tool that employs Voice over IP (VoIP) technology to provide both the audio as well as the visuals to your Windows workstation. Prior to the session, you should run a System Check via the following URL to verify your workstation meets the following minimum requirements. (By the way, we have given Centra the requirement to provide a non-Windows-centric client to connect to these sessions) System Check: https://stg.centra.com/SysCheck/main/Customers/ibmstg Windows 2000 or Windows XP Internet Explorer 5.01, Netscape 7.2, Firefox 1.0 or later. 28.8 kbps or faster Internet connection P350+ MHz, 128+ MB memory 800x600 16-bit color display or better sound card and speakers (to hear the audio portion of the LVC) microphone (required if you want to ask a question during the LVC) Replays: The replays are available about 4 hours after the Live event. To attend the replay, use the same connect/attend URL. REPLAY: Connect/listen to the Replay and download the presentation from the z/VM Website at: http://www.vm.ibm.com/education/lvc The replay from the Nov 27th Linux LVC, Linux on System z Planning - Where to Begin? is available from the z/VM website or the replay url below. Attend the Replay from the Live Virtual Class (LVC) session using the following URL: https://asp22.centra.com:443/GA/main/005d3ac0011610802ba796c7 Please direct any questions to Julie Liesenfelt at [EMAIL PROTECTED] Regards, Pam C
Re: HCD question
It's true that you can't add devices dynamically from VM if VM isn't the
owner of the IOCDS, but you can add them from z/OS and VM will see them.
Dennis
I do not feel obliged to believe that the same God who has endowed us
with sense, reason, and intellect has intended us to forgo their use.
-- Galileo Galilei
-Original Message-
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Jim Bohnsack
Sent: Monday, December 03, 2007 10:12
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: [IBMVM] HCD question
We do all the HCD maintenance from one of the z/OS lpars. You do not
have to send the files to VM. I'm not sure but what that might cause a
problem altho you would be just loading the same set of IO definitions.
VM finds the IO definitions at ipl time. I don't even know if our IOCP
program would run or abend on the VM side, altho I suspect it works. As
someone else said there is no operating system dependencies in the IOCDS
that VM needs or uses. As someone else said, there is the drawback in
not being to directly add a device from VM since the VM lpar is not the
owner of the IOCDS.
Jim
Davis, Larry wrote:
This is a multi-part message in MIME format.
--_=_NextPart_001_01C835BF.C1EB9CCD
Content-Type: text/plain;
charset=us-ascii
Content-Transfer-Encoding: quoted-printable
You should be able to use z/OS's HCD to create the IOCDS for z/VM. I
believe you will need to send the files to VM and use the IOCP routine
to write it out to the SE
=20
I use this code to compile and write out the IOCDS source file
=20
/***/
/* 'IOCP RAPTORA0 ( ICP WRTA0 DYN DESC1 RAPTORA0 DESC2' TODAY */
/***/
TRUE =3D (1=3D1)
FALSE=3D \TRUE
WRITE_IT =3D TRUE
TODAY=3D DATE('S')
IO_NAME =3D 'RAPTOR'
IO_TYPE =3D 'A2'
IOCP_FN =3D IO_NAME||IO_TYPE
IO_OPT1 =3D 'ICP '
IO_OPT2 =3D 'DYN DESC1' IOCP_FN 'DESC2' TODAY
SAY;SAY;SAY 'BUILDING IOCP FILE' IOCP_FN TODAY '. . .'
IF WRITE_IT THEN DO
'IOCP' IOCP_FN '(' IO_OPT1 'WRT'||IO_TYPE IO_OPT2
END
ELSE DO
'IOCP' IOCP_FN '(' IO_OPT1 'NOWRT' IO_OPT2
END
EXIT
=20
Larry
=20
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED]
On
Behalf Of Hilliard, Chris
Sent: Monday, December 03, 2007 10:06 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: HCD question
I'm currently installing z/VM 5.3. I have two other LPARs on this box
running z/OS 1.4 and z/OS 1.7. Can I maintain (either temporarily or
permanently) my hardware/software configuration for the z/VM LPAR
using
HCD under z/OS? I have a huge learning curve ahead of me and not
having
to learn z/VM's HCD would lighten my load a bit.
=20
Any words of wisdom from the community?
=20
Thanks in advance...Chris
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=
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Re: Tues, Dec 4 - Linux on System z Security - Live Virtual Class
Chuck Morse sent an announcement to the linux-390 listserver on November 16. Alan Ackerman wrote: Wish you'd given us more warning. I just found this, and the class starts at 8 am tomorrow Pacific Time, and if I send it to my colleagues, most of them won't see it in ti me. Did I miss some previous message? It's not in my calendar -- but that could be my mistake . Worse than that, I cannot post this message. I'm getting that Alan Ackerman Alan (dot) Ackerman (at) Bank of America (dot) com -- Rich Smrcina VM Assist, Inc. Phone: 414-491-6001 Ans Service: 360-715-2467 rich.smrcina at vmassist.com http://www.linkedin.com/in/richsmrcina Catch the WAVV! http://www.wavv.org WAVV 2008 - Chattanooga - April 18-22, 2008
Re: Tues, Dec 4 - Linux on System z Security - Live Virtual Class
On Mon, 3 Dec 2007 17:32:02 -0500, Pamela Christina in cold and snow Endi cott NY [EMAIL PROTECTED] wrote: Just a reminder that the next Linux on System z Live Virtual Class is Tuesday, Dec 4th at 11:00 AM ET. There is no charge to participate in these technical education sessions. Date: Tuesday, December 4, 2007 Time: 11:00 AM ET U.S. Canada / 5:00 PM GMT Duration: 75 minutes Topic: Linux on System z Security Presenter: Peter Spera, IBM Linux on System z Design and System Integrit y Competency Center. Abstract: This presentation will cover a broad range of security topic relevant to enterprise deployments of Linux on System z. Vendor and open source offerings will be touched on, as well as some typical deployments including a DMZ. Also, options for hardware cryptography utilization will be explored in detail. Connect/Listen the Replay to the Live Virtual Class (LVC) session using the following URL: https://asp22.centra.com:443/GA/main/005d3ac0011610802ba78f11 You can connect to the LVC session up to 15 minutes prior to the start of the session. (Connecting using Centra during the live LVC allows you the option of asking questions.) OR If you are unable to connect to the Live Virtual Class session, you can listen to the audio portion of the Linux session via telephone using the following: Phone Number 1: 1-888-240-4148 Phone Number 2: 1-719-234-0214 Access Code: 736296 Note: use of the telephone connection does not provide capability for yo u to ask questions during the session. System Check The LVC will be delivered using the Centra tool that employs Voice over IP (VoIP) technology to provide both the audio as well as the visuals to your Windows workstation. Prior to the session, you should run a System Check via the following URL to verify your workstation meets the following minimum requirements. (By the way, we have given Centra the requirement to provide a non-Windows-centric client to connect to these sessions) System Check: https://stg.centra.com/SysCheck/main/Customers/ibmstg Windows 2000 or Windows XP Internet Explorer 5.01, Netscape 7.2, Firefox 1.0 or later. 28.8 kbps or faster Internet connection P350+ MHz, 128+ MB memory 800x600 16-bit color display or better sound card and speakers (to hear the audio portion of the LVC) microphone (required if you want to ask a question during the LVC) Replays: The replays are available about 4 hours after the Live event. To attend the replay, use the same connect/attend URL. REPLAY: Connect/listen to the Replay and download the presentation from the z/VM Website at: http://www.vm.ibm.com/education/lvc The replay from the Nov 27th Linux LVC, Linux on System z Planning - Where to Begin? is available from the z/VM website or the replay url below. Attend the Replay from the Live Virtual Class (LVC) session using the following URL: https://asp22.centra.com:443/GA/main/005d3ac0011610802ba796c7 Please direct any questions to Julie Liesenfelt at [EMAIL PROTECTED] Regards, Pam C = == == Wish you'd given us more warning. I just found this, and the class starts at 8 am tomorrow Pacific Time, and if I send it to my colleagues, most of them won't see it in ti me. Did I miss some previous message? It's not in my calendar -- but that could be my mistake . Worse than that, I cannot post this message. I'm getting that Alan Ackerman Alan (dot) Ackerman (at) Bank of America (dot) com
Re: HCD question
You're right and we've certainly done or do that. Jim O'Brien, Dennis L wrote: It's true that you can't add devices dynamically from VM if VM isn't the owner of the IOCDS, but you can add them from z/OS and VM will see them. Dennis I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use. -- Galileo Galilei -- Jim Bohnsack Cornell University (607) 255-1760 [EMAIL PROTECTED]
