Hi Bruce I had to backout the 630 upgrade while they finished upgrading their apps to sles 11.4 which is running with very little paging if any at all under 540 with 4gb xstore and cmma=on in kernel parms.
This Sunday I will try VM 630 again but without xstore and with 16GB of central storage. Someone else replied that cmma has been removed from sles 11 but I think I am using really using what is called cmm2. When we first started with sles 9 and vm530 the recommendations from IBM were to let the linux swap to vdisk and only increase the vm size when swapping became excessive. My linux clients have 2GB or less of storage and at least 3GB of swap to vdisk defined. The early write may be my problem as 630 would be writing all of the vdisk pages to aux storage before cmma would tell VM to throw away the page. -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Bruce Hayden Sent: Friday, December 18, 2015 1:56 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: New Subscriber's first question. Hi Jim, welcome to the mailing list. z/VM 6.3 had many changes to memory management, and it will use more paging space. For one, it will write pages out "early", meaning before it has to actually free up a page. As part of that, XSTORE is no longer recommended and I'd suggest the next time you IPL, change the LPAR configuration to 16 GB of storage with no expanded storage. Without knowing more details on your VM and Linux configuration, it is hard to say why it is using so much more page space. Did the size of the guests increase when you upgraded them to SLES 11? The CMMA support in z/VM did not change between 5.4 and 6.3 but it may have changed in Linux from SLES 10 to SLES 11. On Fri, Dec 18, 2015 at 1:12 PM, Davis, Jim [PRI-1PP] < jim.da...@primerica.com> wrote: > I am a systems programmer at Primerica Life Insurance. > We have been running SLES linux under VM for nine years. > We only have four production VMs on one lpar using a single IFL. > > We will be installing a Z13 in Jan 2016 which has required me to > upgrade all SLES 10.3 VMs to SLES 11.4 and VM from 540 to 630. > > The VM lpar has 12GB of storage plus 4GB of xstore. > Under 540 I did not experience any paging to external VM page datasets. > CMMA=ON > > When I bring up VM 630, I see massive movement of pages to xstore and > then page outs to aux storage, filling up aux storage. > I have increase aux storage to 3x but it keeps growing. > > It acts like CMMA is not functioning under VM 630. > > Any assistance would be greatly appreciated. > > Jim Davis > > > > > ---------------------------------------------------------------------- > 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/ > -- Bruce Hayden z/VM and Linux on z Systems ATS IBM, Endicott, NY ---------------------------------------------------------------------- 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/
