Re: HIPER MCL for z10 processors
Hi Marcy, Thanks for the details much appreciated! Thank You, Terry Martin Lockheed Martin - Citic z/OS and z/VM Performance Tuning and Operating Systems Support Office - 443 348-2102 Cell - 443 632-4191 -Original Message- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Marcy Cortes Sent: Sunday, June 13, 2010 12:08 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: HIPER MCL for z10 processors I failed to mention that the kernel bug is for kernel levels earlier than sles 10. RH fix is here http://rhn.redhat.com/errata/RHSA-2010-0398.html bugzilla 580839 ). The IBM kernel crew had fixed the problem in later kernels preemptively. We haven't put the microcode fix on yet. Our first opportunity in dev is later this month. While it is HIPER, I would bet its pretty rare. We have a ton of other workload across a half dozen z10s and it only has affected this one particular application. One thing interesting to note that was new to me being a VM person from way back... in Linux if a problem like this occurs that the kernel detects, the process that tripped over it will be killed and linux will continue on. So in our case that meant restarting the java application and the server itself didn't' need to be rebooted. If the VM CP nucleus had tripped, a hard abend dump would have been taken and VM would have restarted itself. While this is more drastic and probably much more impactful, it lets IBM get what they need right away instead of spending a lot of time trying to diagnose things without the dump.You can make Linux act like this if you wish (and I'm pondering making it our default in the standard builds here..). You can turn on kernel.panic_on_oops . Linux will go into disabled wait and then you can dump it. There's even ways to make it dump automatically or you can #CP IPL dumpvoladdress and capture it that way. There's some SHARE presentations that go into the details so I won't. You do want to set up a dump volume with the dump program on it rather than trying to use the CP VMDUMP command which will result in you sitting and twiddling your thumbs for 2 hours to dump 6G... One could monitor their /var/log/messages to see if they have any processes being terminated with exceptions and check if this problem is affecting their applications. 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 Martin, Terry R. (CMS/CTR) (CTR) Sent: Saturday, June 12, 2010 6:42 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: [IBMVM] HIPER MCL for z10 processors Thanks Marcy! BTW, how serious is the Kernel bug and did you install this fix? Thank You, Terry Martin Lockheed Martin - Citic z/OS and z/VM Performance Tuning and Operating Systems Support Office - 443 348-2102 Cell - 443 632-4191
Assign an additional Virtual CPU to Linux guest
Hi I am running z/VM 5.4 and RHEL 5.2 and I want to add another VCPU to a Linux guest dynamically. Can this be done without the need to recycle the guest? And if so what is the command to do so? Thanks in advance for the help! Thank You, Terry Martin Lockheed Martin - Citic z/OS and z/VM Performance Tuning and Operating Systems Support Office - 443 348-2102 Cell - 443 632-4191
Am I not supposed to use this size?
Greetings, I defined 3390 dasd with a size of 30051 cylinders. It is defined to one VM user and the other users link to it. I discovered that if I do CP LINk from the VSE guest, I link without an issue. But the links in the directory do not seem to be working and I have to relink from the guest manually? It links then Any clue? Thanks. Suleiman Shahin _ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccountocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
Re: Am I not supposed to use this size?
'Not working' isn't much to go on. What messages are issued at log on time? On 06/13/2010 07:37 PM, Suleiman Shahin wrote: Greetings, I defined 3390 dasd with a size of 30051 cylinders. It is defined to one VM user and the other users link to it. I discovered that if I do CP LINk from the VSE guest, I link without an issue. But the links in the directory do not seem to be working and I have to relink from the guest manually? It links then Any clue? Thanks. Suleiman Shahin -- Rich Smrcina Phone: 414-491-6001 http://www.linkedin.com/in/richsmrcina Catch the WAVV! http://www.wavv.org WAVV 2011
Re: Am I not supposed to use this size?
I get no messages anywhere. Thanks. Suleiman Shahin Date: Sun, 13 Jun 2010 19:57:28 -0500 From: r...@velocitysoftware.com Subject: Re: Am I not supposed to use this size? To: IBMVM@LISTSERV.UARK.EDU 'Not working' isn't much to go on. What messages are issued at log on time? On 06/13/2010 07:37 PM, Suleiman Shahin wrote: Greetings, I defined 3390 dasd with a size of 30051 cylinders. It is defined to one VM user and the other users link to it. I discovered that if I do CP LINk from the VSE guest, I link without an issue. But the links in the directory do not seem to be working and I have to relink from the guest manually? It links then Any clue? Thanks. Suleiman Shahin -- Rich Smrcina Phone: 414-491-6001 http://www.linkedin.com/in/richsmrcina Catch the WAVV! http://www.wavv.org WAVV 2011 _ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccountocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
Re: Am I not supposed to use this size?
On: Mon, Jun 14, 2010 at 12:37:33AM +,Suleiman Shahin Wrote: } I defined 3390 dasd with a size of 30051 cylinders. It is defined to one VM user and the other users link to it. } I discovered that if I do CP LINk from the VSE guest, I link without an issue. } } But the links in the directory do not seem to be working and I have to relink from the guest manually? It links then Just as a pure WAG here, I suspect that whatever process (AUTOLOG1?) attaches the real disk containing this (not-so)minidisk to system is running After the log on of the VM that wants it. -- Rich Greenberg Sarasota, FL, USA richgr atsign panix.com + 1 941 378 2097 Eastern time. N6LRT I speak for myself my dogs only.VM'er since CP-67 Canines:Val, Red, Shasta Casey (RIP), Red Zero, Siberians Owner:Chinook-L Retired at the beach Asst Owner:Sibernet-L
Re: Am I not supposed to use this size?
First time I use this odd size and wondered if it was acceptable to zVM 5.3 ND Zvse 4.1. I will look for the offending party. Thanks. Suleiman Shahin Just as a pure WAG here, I suspect that whatever process (AUTOLOG1?) attaches the real disk containing this (not-so)minidisk to system is running After the log on of the VM that wants it. _ Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_1
