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 -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@vm.marist.edu] On Behalf Of Mark Wheeler Sent: Thursday, March 17, 2011 1:05 PM To: LINUX-390@vm.marist.edu Subject: Re: [LINUX-390] Where is kernel loaded in memory? Yes to both. The fundamental problem is one of expectations. One of z/VM's strengths is that it virtualizes storage. While that means storage can be overcommitted, it also means that unused storage gets paged out. Alas, some of that storage needs to get paged back in when the server awakens. Unfortunately, the customer expects that to occur instantaneously. Most customers of nearly all servers! If all servers get assigned RESERVEd pages, people will likely be more unhappy than they are now. I suspect SET RESERVE will cause some interesting side effects. Just speculating, but I think it may force these guests to look like polling guests, in that pages will only be paged out during emergency scan, e.g probably not the pages you want. Hence, as Rob van der Heij has recommended, you may need to beef up your XSTOR. Mark Wheeler UnitedHealth Group > Date: Thu, 17 Mar 2011 11:38:52 -0700 > From: dkreu...@vm-resources.com > Subject: Re: Where is kernel loaded in memory? > To: LINUX-390@VM.MARIST.EDU > > Have you considered SET RESERVE for this guest? What about expanded > storage tweaks/increase? > David > > > -------- Original Message -------- > Subject: Re: Where is kernel loaded in memory? > From: Mark Wheeler <mwheele...@hotmail.com> > Date: Thu, March 17, 2011 2:11 pm > To: LINUX-390@VM.MARIST.EDU > > MQ Broker. > > > > Date: Thu, 17 Mar 2011 12:22:35 -0500 > > From: marcy.d.cor...@wellsfargo.com > > Subject: Re: Where is kernel loaded in memory? > > To: LINUX-390@VM.MARIST.EDU > > > > Mark, is this WAS? Is it possible it involves the heap? (BTDT :) > > > > > > 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/ > > ---------------------------------------------------------------------- > 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/
