Re: Error using command QUERY ACCESSORS VMSYS:
I observed some details when I started to test with a Rexx server using WAKEUP (EXT. It appears that the SFS server sends the CMS client one interrupt telling "something has changed in something you know about" It is then up to the CMS client to decide when it will ask the SFS server what was changed. As long as the CMS client does not not send that question, no other interrupts are sent to him. As long as no SFS objects are touched, the CMS client doesn't have to bother the SFS server with his question "please send me the changes" 2009/4/2 Alan Altmark > > On Wednesday, 04/01/2009 at 09:46 EDT, Alan Ackerman > wrote: > > > I was under the impression (from something I read here) that the cached > C > > MS list of files was > > updated when someone changed files on the directory. For SFS to inform > CM > > S of this would > > required that it know that CMS had it accessed. If this isn't what > happen > > s, I'll have to try to find > > that previous discussion and attempt to understand it again. > > This was addressed in another post. Yes, there is a cache of meta data. > > > If I access a file-control directory and issue LISTFILE * * fm, then > some > > one adds or deletes a file > > on the directory and I issue LISTFILE * * fm again, does it show the > diff > > erence? (I think it does.) > > Yes. > > > If > > so, how? Does it reload the entire file list each time from the SFS > serve > > r? If so, what is the value of > > caching the list? > > If memory serves, the cache allowed CMS to detect that someone else had > changed the file under you so that XEDIT, for example, could warn you that > the file had changed and "Are you sure?" (I have oh-so-vague > recollections that the cache was a late add.) \ > > > Same question for a dircontrol directory. (I suspect it doesn't show the > > difference.) > > The whole point of dircontrol directories is the access-to-release > consistency of the content. As long as you have the directory accessed, > no changes to the files in it will be visible to you, so it doesn't really > matter if the cache is present or not. > > Alan Altmark > z/VM Development > IBM Endicott -- Kris Buelens, IBM Belgium, VM customer support
Re: File System - If you had everything, where would you put it?
David, Thanks. 1. How does OpenSolaris zfs utilize the storage tier on System z? Are the disks allocated to zfs pool(s) simply reserved CMS formatted disks? 2. How does the Async I/O in ZFS work? Would the guest that requested the I/O be signaled with an ext interrupt by the I/O appliance? 3. What API/system transport layer would be used in VM for guests to conduct I/O through an appliance managing ZFS? Regards, --. .- .-. -.-- Gary Dennis 0 ... living between the zeroes ... 0 On 4/1/09 8:47 PM, "David Boyes" wrote: > Some of the STK/Sun disks have hardware features to do this. OpenAFS or Lustre > could do this if you allow Linux guests to provide the services, or ZFS if you > allow OpenSolaris guests. It¹d be very easy to package up an appliance server > image to do what you need done with either one (Linux or OpenSolaris). > > Other than that, you have to use SFS or BFS, and both need some work to do > continuous availability. Minidisks won¹t work for this. > > On 4/1/09 5:32 PM, "Gary M. Dennis" wrote: > >> Is there a VM I/O management system available which will: >> >> 1. Support space allocation requests for guests on a sparse basis? The file >> server needs to make the guest believe it actually has the entire allocation >> while only tying up space in the pool the guest actually used. >> >> 2. Support Async I/O requests from multiple guests? >> >> 3. Dynamically scale and from sub- TB to n EB. >
Re: Error using command QUERY ACCESSORS VMSYS:
On Wednesday, 04/01/2009 at 09:46 EDT, Alan Ackerman wrote: > I was under the impression (from something I read here) that the cached C > MS list of files was > updated when someone changed files on the directory. For SFS to inform CM > S of this would > required that it know that CMS had it accessed. If this isn't what happen > s, I'll have to try to find > that previous discussion and attempt to understand it again. This was addressed in another post. Yes, there is a cache of meta data. > If I access a file-control directory and issue LISTFILE * * fm, then some > one adds or deletes a file > on the directory and I issue LISTFILE * * fm again, does it show the diff > erence? (I think it does.) Yes. > If > so, how? Does it reload the entire file list each time from the SFS serve > r? If so, what is the value of > caching the list? If memory serves, the cache allowed CMS to detect that someone else had changed the file under you so that XEDIT, for example, could warn you that the file had changed and "Are you sure?" (I have oh-so-vague recollections that the cache was a late add.) \ > Same question for a dircontrol directory. (I suspect it doesn't show the > difference.) The whole point of dircontrol directories is the access-to-release consistency of the content. As long as you have the directory accessed, no changes to the files in it will be visible to you, so it doesn't really matter if the cache is present or not. Alan Altmark z/VM Development IBM Endicott
Re: File System - If you had everything, where would you put it?
On Wednesday, 04/01/2009 at 05:33 EDT, "Gary M. Dennis" wrote: > Is there a VM I/O management system available which will: > > 1. Support space allocation requests for guests on a sparse basis? The file > server needs to make the guest believe it actually has the entire allocation > while only tying up space in the pool the guest actually used. This is a function of the disk storage controller. IBM Flashcopy SE (Space Efficient) enables overcommittment (and, hence, UNDERprovisioning!) of storage. > 2. Support Async I/O requests from multiple guests? That is SSCH or DIAGNOSE 0x250. > 3. Dynamically scale and from sub- TB to n EB. Storage controllers can be provisioned with a wide range of backing store. If a guest needs more disk space, give it another minidisk. It is up to the guest to aggregate multiple minidisks into a single data repository. (A la LVM in Linux.) z/VM does not have multiple-extent minidisks. Alan Altmark z/VM Development IBM Endicott
Re: File System - If you had everything, where would you put it?
Some of the STK/Sun disks have hardware features to do this. OpenAFS or Lustre could do this if you allow Linux guests to provide the services, or ZFS if you allow OpenSolaris guests. It'd be very easy to package up an appliance server image to do what you need done with either one (Linux or OpenSolaris). Other than that, you have to use SFS or BFS, and both need some work to do continuous availability. Minidisks won't work for this. On 4/1/09 5:32 PM, "Gary M. Dennis" wrote: Is there a VM I/O management system available which will: 1. Support space allocation requests for guests on a sparse basis? The file server needs to make the guest believe it actually has the entire allocation while only tying up space in the pool the guest actually used. 2. Support Async I/O requests from multiple guests? 3. Dynamically scale and from sub- TB to n EB.
Re: Error using command QUERY ACCESSORS VMSYS:
On Wed, 25 Mar 2009 11:38:41 -0400, Alan Altmark wrote: >On Wednesday, 03/25/2009 at 12:05 EDT, Alan Ackerman > wrote: > >> Can someone explain this restriction to me. If I have accessed a >> file mode directory, doesn't the SFS server know that? > >ACCESS of a filecontrol directory doesn't really "access" anything. CMS >reads the directory and caches the information, then closes the director y. > That same sequence could just an app making CSL calls. So, no, the >server doesn't know you've accessed a filecontrol directory. > >ACCESS of a dircontrol directory is different since you have a consisten t >(fixed) ACCESS-to-RELEASE view of the file content. The SFS server has to >maintain a "bookmark" for you, and so must keep track of ACCESS and >RELEASE. > >Alan Altmark >z/VM Development >IBM Endicott > = == == I was under the impression (from something I read here) that the cached C MS list of files was updated when someone changed files on the directory. For SFS to inform CM S of this would required that it know that CMS had it accessed. If this isn't what happen s, I'll have to try to find that previous discussion and attempt to understand it again. If I access a file-control directory and issue LISTFILE * * fm, then some one adds or deletes a file on the directory and I issue LISTFILE * * fm again, does it show the diff erence? (I think it does.) If so, how? Does it reload the entire file list each time from the SFS serve r? If so, what is the value of caching the list? Same question for a dircontrol directory. (I suspect it doesn't show the difference.) I have many years of heavy use of file control directories, but hardly an y with dircontrol directories. To my mind, file control directories behave right, and make it much easier to write applications. Alan Ackerman Alan (dot) Ackerman (at) Bank of America (dot) com
Re: 5.4 Install curiosity
0901 was released last week (aka 5403) http://www.vm.ibm.com/service/rsu/stk540.html Marcy "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -Original Message- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Stephen Frazier Sent: Wednesday, April 01, 2009 1:47 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: [IBMVM] 5.4 Install curiosity Steve Mitchell wrote: > To the best of my knowledge 'YES'. I do know I put the DVD in the > drive, and when the lights quit flashing entered go. I though I > verified all the messages, but as I said originally, I am human, ie 'to err is human'! > In that case then you have installed the RSU that was shipped with the order. Is it the latest RSU available? I don't know and neither do you. Order from IBM the latest RSU. Apply it. If anything applies then you didn't have the latest RSU. If nothing applies then you have it already. When IBM releases a new RSU order it and apply it. -- Stephen Frazier Information Technology Unit Oklahoma Department of Corrections 3400 Martin Luther King Oklahoma City, Ok, 73111-4298 Tel.: (405) 425-2549 Fax: (405) 425-2554 Pager: (405) 690-1828 email: stevef%doc.state.ok.us
File System - If you had everything, where would you put it?
Is there a VM I/O management system available which will: 1. Support space allocation requests for guests on a sparse basis? The file server needs to make the guest believe it actually has the entire allocation while only tying up space in the pool the guest actually used. 2. Support Async I/O requests from multiple guests? 3. Dynamically scale and from sub- TB to n EB. --. .- .-. -.-- Gary Dennis 0 ... living between the zeroes ... 0
Re: 5.4 Install curiosity
Steve Mitchell wrote: To the best of my knowledge 'YES'. I do know I put the DVD in the drive, and when the lights quit flashing entered go. I though I verified all the messages, but as I said originally, I am human, ie 'to err is human'! In that case then you have installed the RSU that was shipped with the order. Is it the latest RSU available? I don't know and neither do you. Order from IBM the latest RSU. Apply it. If anything applies then you didn't have the latest RSU. If nothing applies then you have it already. When IBM releases a new RSU order it and apply it. -- Stephen Frazier Information Technology Unit Oklahoma Department of Corrections 3400 Martin Luther King Oklahoma City, Ok, 73111-4298 Tel.: (405) 425-2549 Fax: (405) 425-2554 Pager: (405) 690-1828 email: stevef%doc.state.ok.us
Re: 5.4 Install curiosity
To the best of my knowledge 'YES'. I do know I put the DVD in the drive, and when the lights quit flashing entered go. I though I verified all the messages, but as I said originally, I am human, ie 'to err is human'! Steve Mitchell Sr Systems Software Specialist Blue Cross Blue Shield of Kansas (785) 291-8885 'There are no degrees of Honesty-you're either Honest or you're not! From: Michael MacIsaac To: IBMVM@LISTSERV.UARK.EDU Date: 04/01/2009 02:03 PM Subject:Re: 5.4 Install curiosity Steve, >From the notes I have taken installing 5.4: Start INSTDVD, it runs for up to two hours, then ... 4. You are asked to place the system RSU in the drive. Insert the z/VM Stacked Recommended Service Upgrade 5401 DVD into the HMC DVD-ROM drive. 5. At the Integrated 3270 Console, type GO. You should see a messages of the form DVDLOAD: LOADING FILE CKD5000x IMAGE *. This step should take two to four minutes.. 6. Finally, you should see the message HCPIDV8329I INSTDVD EXEC ENDED SUCCESSFULLY. So do you remember plugging in the 2nd DVD (RSU), typing "GO" and seeing those messages? "Mike MacIsaac"(845) 433-7061 CONFIDENTIALITY NOTICE: This email message and any attachments are for the sole use of the intended recipient(s) and may contain proprietary, confidential, trade secret or privileged information. Any unauthorized review use, disclosure or distribution is prohibited and may be a violation of law. If you are not the intended recipient or a person responsible for delivering this message to an intended recipient, please contact the sender by reply email and destroy all copies of the original message.
Re: 5.4 Install curiosity
Steve, >From the notes I have taken installing 5.4: Start INSTDVD, it runs for up to two hours, then ... 4. You are asked to place the system RSU in the drive. Insert the z/VM Stacked Recommended Service Upgrade 5401 DVD into the HMC DVD-ROM drive. 5. At the Integrated 3270 Console, type GO. You should see a messages of the form DVDLOAD: LOADING FILE CKD5000x IMAGE *. This step should take two to four minutes. 6. Finally, you should see the message HCPIDV8329I INSTDVD EXEC ENDED SUCCESSFULLY. So do you remember plugging in the 2nd DVD (RSU), typing "GO" and seeing those messages? "Mike MacIsaac"(845) 433-7061
Re: 5.4 Install curiosity
> (Embedded image moved to file: pic06422.jpg) > Am I confused about what this process is doing? Your screen shot didn't make it, but I'm guessing it's applying something that looks like an RSU. As I said, things may have been changed recently. The DVD I got for 5.4 did not have the RSU on it, and did not include the RSU in the order, so I hit a couple of bugs that were fixed in the RSU the hard way. IBM may also have remastered the disk with at least the initial 5.4 RSU applied. Would make sense if they did. In any case, ordering the latest RSU and applying it will fix the original problem. VMSES is smart enough to do nothing if the service is already applied. -- db
Re: 5.4 Install curiosity
Perhaps I'm mistaken, but I have a DVD labeled z/VM Stacked Recommended Service Upgrade 5402. The installation materials, specifically Guide for Automated Installation and Service, include the following process in the INSTDVD instructions: (Embedded image moved to file: pic06422.jpg) Am I confused about what this process is doing? Steve Mitchell Sr Systems Software Specialist Blue Cross Blue Shield of Kansas (785) 291-8885 'There are no degrees of Honesty-you're either Honest or you're not! From: David Boyes To: IBMVM@LISTSERV.UARK.EDU Date: 04/01/2009 11:52 AM Subject:Re: 5.4 Install curiosity Order the latest RSU for electronic delivery from IBM. Unless something has changed recently, the RSU is not on the DVD. CONFIDENTIALITY NOTICE: This email message and any attachments are for the sole use of the intended recipient(s) and may contain proprietary, confidential, trade secret or privileged information. Any unauthorized review use, disclosure or distribution is prohibited and may be a violation of law. If you are not the intended recipient or a person responsible for delivering this message to an intended recipient, please contact the sender by reply email and destroy all copies of the original message.
Re: 5.4 Install curiosity
To clarify... when that RSU arrives, load it onto the MAINT 500 disk. If you transfer it to the 500 disk from an internet delivery (rather than tape), be sure to specify the download arguments as documented at that site, and then use the DETERSE command to reformat it so that the VMSES/E commands will work against it. Mike Walter Hewitt Associates Any opinions expressed herein are mine alone and do not necessarily represent the opinions or policies of Hewitt Associates. "David Boyes" Sent by: "The IBM z/VM Operating System" 04/01/2009 11:51 AM Please respond to "The IBM z/VM Operating System" To IBMVM@LISTSERV.UARK.EDU cc Subject Re: 5.4 Install curiosity Order the latest RSU for electronic delivery from IBM. Unless something has changed recently, the RSU is not on the DVD. The information contained in this e-mail and any accompanying documents may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient of this message, or if this message has been addressed to you in error, please immediately alert the sender by reply e-mail and then delete this message, including any attachments. Any dissemination, distribution or other use of the contents of this message by anyone other than the intended recipient is strictly prohibited. All messages sent to and from this e-mail address may be monitored as permitted by applicable law and regulations to ensure compliance with our internal policies and to protect our business. E-mails are not secure and cannot be guaranteed to be error free as they can be intercepted, amended, lost or destroyed, or contain viruses. You are deemed to have accepted these risks if you communicate with us by e-mail.
Re: 5.4 Install curiosity
Order the latest RSU for electronic delivery from IBM. Unless something has changed recently, the RSU is not on the DVD.
5.4 Install curiosity
I'm installing 5.4 w/DVD on 2nd Level. I've made it to Step 6:Run SERVIC E of Chapter 7 Load the System Image. I've 'acc 500 c' then 'listfile * servlink c', NOTHING. I've followed the steps and messages quite succinctly, but I am human and may have missed something when doing the RSU phase of INSTDVD. I have IPL'd the 5.4 system several times and have logged in as maint,operator a nd tcpmaint, all work fine. Now I'm puzzled, dare say stymied as to what to do next. Go On? Re DO INSTDVD? Order RSU from IBM? Any guidance is appreciatted. THANKS.
Re: z/VM and DS6000 Disks
Under the circumstances, it would appear that this forum is a good avenue of first, not last, resort for you. The folks who linger here like to answer questions and help with problems. That includes the ones from IBM as well as the ones who aren't. Regards, Richard Schuh
Blog with more info on Mantissa and z/VOS
Came across this blog this morning with more (still not a lot) of information on z/VOS http://www.mantissa.com/blog cheers Lionel B. Dyck, Consultant/Specialist Enterprise Platform Services, Mainframe Engineering KP-IT Enterprise Engineering 925-926-5332 (8-473-5332) | E-Mail: lionel.b.d...@kp.org AIM: lbdyck | Yahoo IM: lbdyck Kaiser Service Credo: "Our cause is health. Our passion is service. We?re here to make lives better.? ?Never attribute to malice what can be caused by miscommunication.? NOTICE TO RECIPIENT: If you are not the intended recipient of this e-mail, you are prohibited from sharing, copying, or otherwise using or disclosing its contents. If you have received this e-mail in error, please notify the sender immediately by reply e-mail and permanently delete this e-mail and any attachments without reading, forwarding or saving them. Thank you.
Re: z/VM and DS6000 Disks
Thanks Alan, My boss built the IODF on one of our z/OS LPARs. That's probably why we're having a "documentation disconnect". "E-debris"?! I got'a remember to use that one. Yeah, we shook our heads too on no support. But this is normal University researcher mentality. We'll keep plugging along until we get the thing up. Thanks again, Bruce Bruce Heckler ACT Datacenter 10280 North Torrey Pines Rd. #375 La Jolla CA. 92093 (858) 534-2152 -Original Message- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Alan Altmark Sent: Tuesday, March 31, 2009 10:15 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: z/VM and DS6000 Disks On Tuesday, 03/31/2009 at 11:27 EDT, "Heckler, Bruce" wrote: > Apparently when you define a string in IODF it builds a string as type FCP. > Then it builds another string type FBASCSI which has the LUN, ..., and > references back to the same offset FCP address. The burning question is when > you plug in addresses to initialize the sysres and such, which set do you use? > If I were doing this myself, I'd keep plugging until I found something that > works. But this machine is locked in a different computer room, I don't have > access, access time, and some other compounding limitations. You're right, the > Install Guide is standard IBM dull but accurate. However, the naming > conventions are a bit confusing between what IODF, INSTDVD, and the Install > manual are using (at least how I read it). The rest of the install is very > simple. Just so you know, z/VM doesn't know or care about the "e-debris"(usually UNIT=) that z/OS puts in an IODF. That "FBASCSI" thing isn't in the IOCP manual and z/VM doesn't require it. We simply require that you define an FCP CHPID and some number of IODEVICEs on that chpid. EDEVICE TYPE FBA FCP_DEVICE ... All installation references to a real FBA device are a reference to an . > Last, I'd LOVE to open a PMR. But the Fine Arts folk who own this box bought > it on a shoestring (read: "No Support Contract"). Note that it also means you cannot upgrade your z/VM for free. Any future upgrade will require payment of the OTC fees again. Alan Altmark z/VM Development IBM Endicott
Re: Using FTP Banner Causes DTCFTS2512I Every 5 Minutes
Hi Tom, My Linux SA confirmed he was using Nagios for this task. He has it turned off for the time being until he can find a less disruptive way of doing this. :) -Mike -Original Message- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Thomas Kern Sent: Friday, March 27, 2009 3:44 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Using FTP Banner Causes DTCFTS2512I Every 5 Minutes Was it a homegrown cron task or a monitoring system like Hobbit/Xymon or Nagios? We have both Hobbit and Nagios but have not yet put in the FTP BANNER. /Tom Kern Michael Coffin wrote: > That was exactly what it was! My Linux sysprog had a cron job kicking > off every 5 minutes to make sure the z/VM FTP servers were available, > and the job would close the connection before we completed writing the > banner. > > Thanks for the suggestion on where to look Mark, much appreciated. :) > > -Mike
Re: A Question about the VM Page and RES volumes
Sorry I let room for misunderstanding: PAV gives more addresses to a volume, hence it can lower the observed IO rate on a per address base. When looking at a volume the IO rate can go up indeed. Queuing is indeed what one needs to look at, VM performance tools however cannot show queues internal in a server, to help them, the server itself should be made PAV aware (Linux can, SFS/DB2 can't). 2009/4/1 Rob van der Heij > On Wed, Apr 1, 2009 at 8:35 AM, Kris Buelens > wrote: > > > In any case, so not only paging: the model you'd use depends on the IO > > rate. If you need lots of space with low IO rates: bigger models don't > > penalize you. PAV will lower the observed IO rate. > > PAV lowers the observed I/O rate? Where do you observe that? > If you create 2 exposures to the same volume, you'd expect to do > *more* I/O per second in peak periods. Thus effectively lower your net > I/O response time. You may not fully double the throughput, so when > PAV spreads the load well, you'd see each of the subchannels take less > than the single one before. But since that's only part of the story, > the I/O rate per subchannel is not a helpful metric. And if you're not > getting pretty close, you might question whether PAV was a good > investment there. > > Really, only when your performance monitor shows you I/O queue time > for the device, PAV could make sense (if that I/O is relevant for your > service levels). As you say, many applications represent a single > requester and don't queue where PAV would be able to help. But even if > the application could, the workload may not be such that it actually > happens. That's why it makes sense to start from the other end: look > at what impacts the service levels of your critical workload. > > Rob > -- > Rob van der Heij > Velocity Software > http://www.velocitysoftware.com/ > -- Kris Buelens, IBM Belgium, VM customer support
Re: A Question about the VM Page and RES volumes
On Wed, Apr 1, 2009 at 8:35 AM, Kris Buelens wrote: > In any case, so not only paging: the model you'd use depends on the IO > rate. If you need lots of space with low IO rates: bigger models don't > penalize you. PAV will lower the observed IO rate. PAV lowers the observed I/O rate? Where do you observe that? If you create 2 exposures to the same volume, you'd expect to do *more* I/O per second in peak periods. Thus effectively lower your net I/O response time. You may not fully double the throughput, so when PAV spreads the load well, you'd see each of the subchannels take less than the single one before. But since that's only part of the story, the I/O rate per subchannel is not a helpful metric. And if you're not getting pretty close, you might question whether PAV was a good investment there. Really, only when your performance monitor shows you I/O queue time for the device, PAV could make sense (if that I/O is relevant for your service levels). As you say, many applications represent a single requester and don't queue where PAV would be able to help. But even if the application could, the workload may not be such that it actually happens. That's why it makes sense to start from the other end: look at what impacts the service levels of your critical workload. Rob -- Rob van der Heij Velocity Software http://www.velocitysoftware.com/
