Re: Where is kernel loaded in memory?
Marcy, Good suggestions. Alas: 1) The app doesn't use java, and 2) The customer refuses to run prime the pump-type scripts because they claim it would just mask the problem Mark Date: Thu, 17 Mar 2011 15:47:12 -0500 From: marcy.d.cor...@wellsfargo.com Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU When you have some memory intensive night time activities, like say scanning checks in cron jobs, or heavy batch stuff, these things happen. We added more memory :(, although lowering the heap size did help some. Anyway you can prime the pump (script to touch your pages in a cron job?)? Marcy -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
Mark, That's an excellent suggestion, inasmuch as we have a couple dozen of these servers running and, if nothing else, sharing code could reduce overall demand for memory. Obviously, the bigger win would be if this is the code that is actually being paged in and causing the delays, since by sharing it would be more likely to be in storage already. The larger problem is going to be getting buy-in from the app owner to implement such a thing. Best regards, Mark Date: Thu, 17 Mar 2011 14:55:07 -0600 From: mp...@novell.com Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU On 3/17/2011 at 04:47 PM, Marcy Cortes marcy.d.cor...@wellsfargo.com wrote: When you have some memory intensive night time activities, like say scanning checks in cron jobs, or heavy batch stuff, these things happen. We added more memory :(, although lowering the heap size did help some. Anyway you can prime the pump (script to touch your pages in a cron job?)? Putting the application into an xip2 file system on a DCSS might help with this quite a bit. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
You get a double benefit from XIP. Not only is the content shared by all guests (so if just one guest is using it, CP has already paged it in), but from the Linux perspective it is point and shoot. (That's why they call it execute in place. But you knew that.) Ordinarily, programs have to be copied from a filesystem into memory, even if the filesystem is backed by memory rather than disk. -- R; On Mar 18, 2011 8:32 AM, Mark Wheeler mwheele...@hotmail.com wrote: Mark, That's an excellent suggestion, inasmuch as we have a couple dozen of these servers running and, if nothing else, sharing code could reduce overall demand for memory. Obviously, the bigger win would be if this is the code that is actually being paged in and causing the delays, since by sharing it would be more likely to be in storage already. The larger problem is going to be getting buy-in from the app owner to implement such a thing. Best regards, Mark Date: Thu, 17 Mar 2011 14:55:07 -0600 From: mp...@novell.com Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU On 3/17/2011 at 04:47 PM, Marcy Cortes marcy.d.cor...@wellsfargo.com wrote: When you have some memory intensive night time activities, like say scanning checks in cron jobs, or heavy batch stuff, these things happen. We added more memory :(, although lowering the heap size did help some. Anyway you can prime the pump (script to touch your pages in a cron job?)? Putting the application into an xip2 file system on a DCSS might help with this quite a bit. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
I was reminded off-list by someone who knows WAS better than I do that unzipping of JAR files renders content sharing moot. Sad, but true. JIT does the same thing. So ... I am a huge fan of XIP, and we should all use it more. But we still have opportunities in all application areas. Even when the sharing is hindered, using DCSS for filesystems is a great advantage. VM can manage the storage. Then if you have content in a DCSS backed filesystem which can utilize mmap(), XIP comes into play and makes things just that much better. -- R; Rick Troth Velocity Software http://www.velocitysoftware.com/ On Fri, Mar 18, 2011 at 08:57, Richard Troth vmcow...@gmail.com wrote: You get a double benefit from XIP. Not only is the content shared by all guests (so if just one guest is using it, CP has already paged it in), but from the Linux perspective it is point and shoot. (That's why they call it execute in place. But you knew that.) Ordinarily, programs have to be copied from a filesystem into memory, even if the filesystem is backed by memory rather than disk. -- R; On Mar 18, 2011 8:32 AM, Mark Wheeler mwheele...@hotmail.com wrote: Mark, That's an excellent suggestion, inasmuch as we have a couple dozen of these servers running and, if nothing else, sharing code could reduce overall demand for memory. Obviously, the bigger win would be if this is the code that is actually being paged in and causing the delays, since by sharing it would be more likely to be in storage already. The larger problem is going to be getting buy-in from the app owner to implement such a thing. Best regards, Mark Date: Thu, 17 Mar 2011 14:55:07 -0600 From: mp...@novell.com Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU On 3/17/2011 at 04:47 PM, Marcy Cortes marcy.d.cor...@wellsfargo.com wrote: When you have some memory intensive night time activities, like say scanning checks in cron jobs, or heavy batch stuff, these things happen. We added more memory :(, although lowering the heap size did help some. Anyway you can prime the pump (script to touch your pages in a cron job?)? Putting the application into an xip2 file system on a DCSS might help with this quite a bit. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
Quote: The larger problem is going to be getting buy-in from the app owner to implement such a thing. Actually, all you need to do is _install_ it on subject file system. There's nothing on the implementation side that needs to be done for it. with kind regards Carsten Otte IBM Linux Technology Center / Boeblingen lab -- omnis enim res, quae dando non deficit, dum habetur et non datur, nondum habetur, quomodo habenda est Mark Wheeler mwheelermn@hotma il.comTo Sent by: Linux on LINUX-390@vm.marist.edu 390 Port cc linux-...@vm.mar ist.edu Subject Re: Where is kernel loaded in memory? 18.03.2011 13:29 Please respond to Linux on 390 Port linux-...@vm.mar ist.edu Mark, That's an excellent suggestion, inasmuch as we have a couple dozen of these servers running and, if nothing else, sharing code could reduce overall demand for memory. Obviously, the bigger win would be if this is the code that is actually being paged in and causing the delays, since by sharing it would be more likely to be in storage already. The larger problem is going to be getting buy-in from the app owner to implement such a thing. Best regards, Mark Date: Thu, 17 Mar 2011 14:55:07 -0600 From: mp...@novell.com Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU On 3/17/2011 at 04:47 PM, Marcy Cortes marcy.d.cor...@wellsfargo.com wrote: When you have some memory intensive night time activities, like say scanning checks in cron jobs, or heavy batch stuff, these things happen. We added more memory :(, although lowering the heap size did help some. Anyway you can prime the pump (script to touch your pages in a cron job?)? Putting the application into an xip2 file system on a DCSS might help with this quite a bit. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
On 3/18/2011 at 08:29 AM, Mark Wheeler mwheele...@hotmail.com wrote: The larger problem is going to be getting buy-in from the app owner to implement such a thing. Why would they care? Do they have an issue when you move their DASD to a new storage array at lease expiration time? Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Moving Oracle off zLinux boxes -- comments from the field?
We just had a surprise announcement by one of the Oracle DBAs during a zLinux Application group planning meeting at our worksite. The DBA advised us that they (Database group) were going to move/migrate all the Oracle databases that we have on zLinux boxes off to an intel/unix platform. He did not offer details of the hardware, or when or how, just that they were going to do it. This is a bite of a surprise as we have just moved our MQ off the Mainframe (zOS) to the zLinux platform (guests on zVM) and that move is doing well. This may be due in part to the false mindset that we have in our upper management at our site that Mainframes are old technology. Also we have had slow response from Oracle on resolving issues we have identify (certifying Oracle 11 on z390x architecture, getting Oracle 10 support for RHEL 5.0 on z390x architecture). Has anyone else on this list had any related war stories similar to what we may be about to experience as this move takes place? James Chaplin Systems Programmer, MVS, zVM zLinux -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Moving Oracle off zLinux boxes -- comments from the field?
We are about to put into production, once we have gotten our multipath (failover) issues resolved with EMC, Oracle 10. We had to step back to SLES 10 SP3+ due to Oracles glacial speed with certification of Oracle 11 on zLinux. Also, the application only runs on Oracle 10, I imagine for the same reason. On a brighter note: Our DB2 on zLinux, the latest DB2 for zLinux, is running in test, again we await a resolution of multipathing (failover) issues with our EMC SAN before we make it production. I share your pain. It took us a long time to convince our management that consolidating/introducing Linux images on the z was a good idea. So far we (well, I) aren't disappointed. The part that sorta called off the nay sayers or hushed them up was when we ran a nightly flow that runs on a pSeries (multiple CPUs, same DS4700 subsystem) on Linux/DB2 that ran 5 times faster on our 1 IFL. Hmmm...hard to argue with that. :-) Just my opinion but it sounds to me like someone lost a bet or a poker game where the loser had to give up their platform for Oracle. Just a WAG, but sounds about as reasonable. When management makes decisions like the one you describe, well it leaves me speechless! At least for a little while. I wish you a good outcome. Michael Simms Systems Programmer zSeries VM, VSE, (z)Linux, AIX Naples Campus, Florida 239-552-3479 Enabling America's Best Local Healthcare Please consider the environment before printing this email and SAVE A TREE. -Original Message- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of CHAPLIN, JAMES (CTR) Sent: Friday, March 18, 2011 2:22 PM To: LINUX-390@VM.MARIST.EDU Subject: Moving Oracle off zLinux boxes -- comments from the field? We just had a surprise announcement by one of the Oracle DBAs during a zLinux Application group planning meeting at our worksite. The DBA advised us that they (Database group) were going to move/migrate all the Oracle databases that we have on zLinux boxes off to an intel/unix platform. He did not offer details of the hardware, or when or how, just that they were going to do it. This is a bite of a surprise as we have just moved our MQ off the Mainframe (zOS) to the zLinux platform (guests on zVM) and that move is doing well. This may be due in part to the false mindset that we have in our upper management at our site that Mainframes are old technology. Also we have had slow response from Oracle on resolving issues we have identify (certifying Oracle 11 on z390x architecture, getting Oracle 10 support for RHEL 5.0 on z390x architecture). Has anyone else on this list had any related war stories similar to what we may be about to experience as this move takes place? James Chaplin Systems Programmer, MVS, zVM zLinux -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
Date: Fri, 18 Mar 2011 14:19:28 +0100 From: co...@de.ibm.com Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU Quote: The larger problem is going to be getting buy-in from the app owner to implement such a thing. Actually, all you need to do is _install_ it on subject file system. There's nothing on the implementation side that needs to be done for it. with kind regards Carsten Otte IBM Linux Technology Center / Boeblingen lab 1) The app owner does the install so there's no hiding it from them 2) The filesystem is 10 GB, which exceeds the DCSS max (unless we were to string several together w/ LVM - ick!) Mark -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
Is it possible to trigger a bogus transaction say, an hour before your first transaction is usually executed? We had a similar problem with CICS back in the '90s. The transaction did a call (a no no back in CICS 1.7) to an external routine which did a lot of paging and a lot of I/O to non-cached controllers. The first time thru, the transaction would abend (AICA...runaway task timer). After storage was loaded, it would run in a few seconds. The cheapest/easiest solution was to trigger the transaction a couple times before users got on. Is that possible with your application? Tom Duerbusch THD Consulting Mark Wheeler mwheele...@hotmail.com 3/17/2011 11:55 AM Bob, No, the question was asked previously, but I chose to ignore it. For one, because it would take way too long to explain adequately, and also that the thread would quickly expand exponentially. Quick answer: we have an app that sees elongated response times on the first transaction of the day. We have traced it back to several thousand synchronous pageins (because stuff got paged out overnight, and our page volumes aren't infinitely fast). All subsequent transactions run sub-second. I have no idea which pages are involved, but it was suggested that since they were synchronous pageins, it may involve the kernel. A POSSIBLE solution that crossed my mind would be to lock kernel pages in storage and see if that solved the problem. All I needed to conduct that little experiment was to know where the kernel lived in storage. Again, I know most everyone who reads this will have the same obvious questions and suggestions, and I appreciate that. Alas, right now there isn't enough time or bandwidth to explain the situation in sufficient detail so as to prevent this thread from blowing up in a hundred different directions. The suggestion to look at /proc/iomem answered my immediate question. As necessary, I'll toss further questions out to the list. Thanks all! Mark Wheeler UnitedHealth Group Date: Thu, 17 Mar 2011 11:30:27 -0600 From: nix.rob...@mayo.edu Subject: Re: Where is kernel loaded in memory? To: LINUX-390@VM.MARIST.EDU An obvious question that no one has bothered to ask as yet: What is the problem you're trying to solve with this? Or, why do you want to know where the kernel loads, and what will you gain from it? Too many times, users or other people (programmers, other sysadmins, ...) come to us with a solution in need of a piece or part, and we never hear the larger question or problem, to which there may be a much simpler answer. The query may be a simple one, the need may be educational. Or it may be a cog in a larger, complex solution to a problem that some, or many of us have already solved in some other way which does not involve walking through the kernel's memory. It's just a thought, but Mark -- What's your original problem or task? -- Robert P. Nix Mayo Foundation .~. RO-OC-1-18 200 First Street SW /V\ 507-284-0844 Rochester, MN 55905 /( )\ - ^^-^^ In theory, theory and practice are the same, but in practice, theory and practice are different. On 3/17/11 5:59 AM, Richard Troth vmcow...@gmail.com wrote: Originally, the kernel loaded at real addr 64k. That is the default for Linux on most platforms. But you could change that, and for 1M alignment, some do so on S/390. Going with mapped memory, it sounds like absolute zero is the virtual pref for kernel space. Cool. Easily handled in all virt mem platforms. -- R; -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Where is kernel loaded in memory?
On 3/18/2011 at 03:14 PM, Mark Wheeler mwheele...@hotmail.com wrote: 1) The app owner does the install so there's no hiding it from them It's going to look just like an EXT2 file system to them. 2) The filesystem is 10 GB, which exceeds the DCSS max (unless we were to string several together w/ LVM - ick!) If you're running RHEL 6, you can concatenate multiple DCSS just by loading them at sequential virtual addresses in memory. I.e., no gaps between one and the next. How much of that file system is code, versus non-executable stuff? If you can segregate the code, that might be worthwhile. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Moving Oracle off zLinux boxes -- comments from the field?
wow, your DBAs have the authority to spend that kind of money and make that kind of change without management signature? So no financial analysis, no technical reason, sounds religious. CHAPLIN, JAMES (CTR) wrote: We just had a surprise announcement by one of the Oracle DBAs during a zLinux Application group planning meeting at our worksite. The DBA advised us that they (Database group) were going to move/migrate all the Oracle databases that we have on zLinux boxes off to an intel/unix platform. He did not offer details of the hardware, or when or how, just that they were going to do it. This is a bite of a surprise as we have just moved our MQ off the Mainframe (zOS) to the zLinux platform (guests on zVM) and that move is doing well. This may be due in part to the false mindset that we have in our upper management at our site that Mainframes are old technology. Also we have had slow response from Oracle on resolving issues we have identify (certifying Oracle 11 on z390x architecture, getting Oracle 10 support for RHEL 5.0 on z390x architecture). Has anyone else on this list had any related war stories similar to what we may be about to experience as this move takes place? James Chaplin Systems Programmer, MVS, zVM zLinux -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ attachment: BARTON.vcf
Server rebooting after doing a CP Q DA from the console
Found a problem today with CP QUERY command that caused our Linux Server to reboot. Using vmcp from a zLinux server, I issued the following command: vmcp q dasd | less Binary file (standard input) matches Error: output (21282 bytes) was truncated, try --buffer to increase size This guest has a large number of DASD attached to it (Oracle database) causing this problem. (Should have used the 'vmcp -b q dasd | less') But I thought I would try the same command from the guest console (#CP Q DA), and got the following response just before the server rebooted: DASD 4886 ON DASD 4886 R/W VI1304 SUBCHANNEL = 014C DASD 4887 ON DASD 4887 R/W VI1305 SUBCHANNEL = 014D Error: output (21282 bytes) was truncated, Two questions as I am a VM rookie, How to you modify the buffer from the console for the CP command? How do you display the buffer size available for a CP command? Also: Why would a query command on a console bring down a linux guest, but vmcp query does not? Is this a know bug? James Chaplin Systems Programmer, MVS, zVM zLinux -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Moving Oracle off zLinux boxes -- comments from the field?
inline: graycol.gifinline: pic26058.gifinline: ecblank.gifattachment: BARTON.vcf
Re: Where is kernel loaded in memory?
On Fri, Mar 18, 2011 at 9:11 PM, Mark Post mp...@novell.com wrote: On 3/18/2011 at 03:14 PM, Mark Wheeler mwheele...@hotmail.com wrote: 1) The app owner does the install so there's no hiding it from them It's going to look just like an EXT2 file system to them. 2) The filesystem is 10 GB, which exceeds the DCSS max (unless we were to string several together w/ LVM - ick!) If you're running RHEL 6, you can concatenate multiple DCSS just by loading them at sequential virtual addresses in memory. I.e., no gaps between one and the next. How much of that file system is code, versus non-executable stuff? If you can segregate the code, that might be worthwhile. The challenges are probably more political than technical. While I would expect the Linux crowd to be open minded and eager to master some of the technical differences, I often see non-mainframe people use any technical difference as an excuse to resist change. They find themselves unable to do their job and resist. Force feeding them z/Linux makes them gag, and management does not see that as their lack of skills but rather as a confirmation of the lack of mainframe skills that they are concerned about. In reality it's more about their inability to master a platform other than their local PC (hardware as well as procedures). Something like sharing code between virtual machines is new to them, and probably beyond their imagination. First of all getting things aligned so that all use the same version of the code, then resist the urge to update any system at will without considering the rest, and then the rituals of actually sharing a single copy in memory (and possibly having to ask one of the old guys for help). PS I would probably not push a 1.7GB DCSS to save 10 MB per virtual machine (and spend another 20 MB per virtual machine to attach it). That is not the thing that makes or breaks your business case. I'm willing to fight with anyone else who has numbers too... :esoapbox. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Moving Oracle off zLinux boxes -- comments from the field?
It's government, what do you expect ;-) James Chaplin -Original Message- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Barton Robinson Sent: Friday, March 18, 2011 5:03 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Moving Oracle off zLinux boxes -- comments from the field? wow, your DBAs have the authority to spend that kind of money and make that kind of change without management signature? So no financial analysis, no technical reason, sounds religious. CHAPLIN, JAMES (CTR) wrote: We just had a surprise announcement by one of the Oracle DBAs during a . . . . -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Moving Oracle off zLinux boxes -- comments from the field?
Value for your dollars, OMG, silly me, you said government forget that. Doesn't happen William 'Doug' Carroll -Original Message- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of CHAPLIN, JAMES (CTR) Sent: Friday, March 18, 2011 5:19 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Moving Oracle off zLinux boxes -- comments from the field? It's government, what do you expect ;-) James Chaplin -Original Message- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Barton Robinson Sent: Friday, March 18, 2011 5:03 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Moving Oracle off zLinux boxes -- comments from the field? wow, your DBAs have the authority to spend that kind of money and make that kind of change without management signature? So no financial analysis, no technical reason, sounds religious. CHAPLIN, JAMES (CTR) wrote: We just had a surprise announcement by one of the Oracle DBAs during a . . . . -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ This communication is for informational purposes only. It is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction. All market prices, data and other information are not warranted as to completeness or accuracy and are subject to change without notice. Any comments or statements made herein do not necessarily reflect those of JPMorgan Chase Co., its subsidiaries and affiliates. This transmission may contain information that is privileged, confidential, legally privileged, and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. Although this transmission and any attachments are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by JPMorgan Chase Co., its subsidiaries and affiliates, as applicable, for any loss or damage arising in any way from its use. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. Please refer to http://www.jpmorgan.com/pages/disclosures for disclosures relating to European legal entities. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Server rebooting after doing a CP Q DA from the console
On Friday, 03/18/2011 at 05:07 EDT, CHAPLIN, JAMES (CTR) james.chap...@associates.dhs.gov wrote: But I thought I would try the same command from the guest console (#CP Q DA), and got the following response just before the server rebooted: DASD 4886 ON DASD 4886 R/W VI1304 SUBCHANNEL = 014C DASD 4887 ON DASD 4887 R/W VI1305 SUBCHANNEL = 014D Error: output (21282 bytes) was truncated, Two questions as I am a VM rookie, How to you modify the buffer from the console for the CP command? How do you display the buffer size available for a CP command? You don't. The Error: output you see wasn't generated by CP; it came from Linux. Ergo, the command you issued didn't actually go to CP. It wouldn't surprise me if someone set up a shell script of some sort to turn #cp (a habit) into vmcp. Why would a query command on a console bring down a linux guest, but vmcp query does not? Is this a know bug? Try again, but issue vmcp query term before you try the #cp. I often see that the LINEND character has been set to something other than # in order to allow use of # in Linux. Alan Altmark z/VM and Linux on System z Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: Server rebooting after doing a CP Q DA from the console
My biggest problem is that I have no way to recreate the problem without impacting our production. The vmcp command is at a level of protection against this problem. But what we want to understand is why would a simple #CP Q DA bring down the guest linux? You should have seen my face as I watched this Linux guest go into a reboot from the console view on a Friday evening :-( I was unable to capture the true output when the CP Q DA failed. James Chaplin Systems Programmer, MVS, zVM zLinux -Original Message- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Alan Altmark Sent: Friday, March 18, 2011 5:54 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Server rebooting after doing a CP Q DA from the console On Friday, 03/18/2011 at 05:07 EDT, CHAPLIN, JAMES (CTR) james.chap...@associates.dhs.gov wrote: But I thought I would try the same command from the guest console (#CP Q DA), and got the following response just before the server rebooted: DASD 4886 ON DASD 4886 R/W VI1304 SUBCHANNEL = 014C DASD 4887 ON DASD 4887 R/W VI1305 SUBCHANNEL = 014D Error: output (21282 bytes) was truncated, Two questions as I am a VM rookie, How to you modify the buffer from the console for the CP command? How do you display the buffer size available for a CP command? You don't. The Error: output you see wasn't generated by CP; it came from Linux. Ergo, the command you issued didn't actually go to CP. It wouldn't surprise me if someone set up a shell script of some sort to turn #cp (a habit) into vmcp. Why would a query command on a console bring down a linux guest, but vmcp query does not? Is this a know bug? Try again, but issue vmcp query term before you try the #cp. I often see that the LINEND character has been set to something other than # in order to allow use of # in Linux. Alan Altmark z/VM and Linux on System z Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
