At this point I'd define a huge ( at least 512MB, but I'd start at 1GB ) VDISK for swap on these WAS systems. As long as you have enough paging space available to VM, you'll be ok.
This is a test to see just how much memory these systems need to run this workload. You can trim the vdisk sizes later when you have a better handle on just how large they really need to be. You'll probably also be better off with multiple smaller vdisks for your production enviromnent. This way linux can be paging on several virtual devices simultaneously. How far short of your load goals are you? What are you using to establish those goals? ( past experience, QOS commitments, etc ) If youre running multiple apps per app server and multiple app servers in a single linux image, then yeah - you'll see WAS eat up huge amounts of memory. You may have to define the virtual machine sizes even larger to get to your goals. Have you stopped everything else on the system that is not needed to run WAS - like inetd, nscd, things that may get started by cron? Also - with linux systems that large, you may start running in to problems with contention below the 2 Gig bar in VM. This can be helped by having more Expanded storage for paging. Using your favorite performance tool check your memory utilization above the 2 Gig bar. If VM is paging like crazy but has memory available above the 2 Gig bar, you may be better off converting some of that central storage to expanded storage. Jay Brenneman Linux Test and Integration Center T/L: 295 - 7745 Extern: 845 - 435 - 7745 [EMAIL PROTECTED] Troyski <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <[EMAIL PROTECTED]> 09/15/04 09:12 AM Please respond to Troyski To [EMAIL PROTECTED] cc Subject Re: Guest freeze Dan, Grinder is running on an external PC. So it's not that. Good call though. Troy. On Wed, 15 Sep 2004 09:00:28 -0400, Daniel Jarboe <[EMAIL PROTECTED]> wrote: > > Hi Daniel, > > > > I have seen the __alloc_pages message in /var/log/messages as well as > > the VM: Killing process message. > > So you are definitely short on storage. Which is why you can get ping > responses, but no new shells/processes forked to log on. > > > One of the guests is 1280Mb, the other 1792. They were initially sized > > at 1024 and 1536 to accomodate the number of websphere JVM's that are > > deployed. > > And these don't seem too skimpy either. > > <snip> > > > Both guests have a 19188k swap disk (VDISK) defined. > > That does seem low considering your real storage sizes. > > > I am using grinder to put the guests under load, but this is no where > > near the sort of load I want to achieve. The grinder test runs for > > approx. 2-3 hours before a guest will hang. > > Is grinder running on these guests or somewhere else? If it's running > on the same image as the one you are load-testing, is it possible that > grinder is chewing up significant resources... stealing from what would > be Websphere's resources? Top may tell... > > ~ Daniel > > > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > -- ---oOo--- Troyski (Public Email) ......................................... :: Web/PGP Key :: www.troyski.co.uk :: :: MSN [EMAIL PROTECTED] :: YIM troy_muller :: :: ICQ #31206542 :: AIM trymul :: :: GS500E XJ600S :: LCDR Troyski :: ......................................... :: NCOS || CQC || SCI100 || SCI101 :: :: NUR101 || SCC#60975 :: ......................................... \'He who dies with the most toys - wins.\' <Unknown> ---oOo--- ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
