Hi
Thanks for the information. I did find another problem related to my
paging. I was having issues with my QREP guests, could not start up the
APPLY process for the application, slow logging on, etc. This is on the
LPAR that I mentioned that was doing the paging. I decided to restart
the z/Linux guest. When I issued the stop from the Operator console I
received the following error just before the guest came down:
HCP415E Six continuous paging errors have occurred on DASD nnnn volume
volser.
This error occurred on the two page packs that I just added yesterday
(VP51A0 and VP51A1). I believe I followed the appropriate steps to
defining and starting the new page data sets.
q alloc page
EXTENT EXTENT TOTAL PAGES HIGH %
VOLID RDEV START END PAGES IN USE PAGE USED
------ ---- ---------- ---------- ------ ------ ------ ----
530PAG 5104 1 3338 600840 301180 594838 50%
VP517A 517A 1 3338 600840 338482 600840 56%
VP517B 517B 1 3338 600840 334685 600838 55%
VP5198 5198 1 3338 600840 337162 600839 56%
VP5199 5199 1 3338 600840 333914 600840 55%
VP5109 5109 0 3338 601020 301240 598846 50%
VP51A0 51A0 1 3338 600840 75804 76125 12%
VP51A1 51A1 1 3338 600840 76068 76734 12%
------ ------ ----
SUMMARY 4694K 2049K 43%
USABLE 4694K 2049K 43%
If you notice there is no error being displayed next to the entry of the
Q ALLOC PAGE display?
Since I saw no other cause for the strange behavior of the Linux guest I
am assuming that the page error was causing this. Any ideas what might
have happened with the page and any recommendations. I have not had any
problems since the restart of the guest but I am wondering if the paging
errors are still there on these packs.
Thank You,
Terry Martin
Lockheed Martin - Information Technology
z/OS & z/VM Systems - Performance and Tuning
Cell - 443 632-4191
Work - 410 786-0386
terry.mar...@cms.hhs.gov
-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Tom Duerbusch
Sent: Tuesday, February 10, 2009 11:45 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Paging
If you don't have a product, and you want to find out who is actively
paging:
Do an IND USER userid for each machine:
ind user linux69
USERID=LINUX69 MACH=ESA STOR=160M VIRT=V XSTORE=NONE
IPLSYS=DEV 0150 DEVNUM=00014
PAGES: RES=00035557 WS=00040960 LOCKEDREAL=00000013 RESVD=00000000
NPREF=00006334 PREF=00000000 READS=00167708 WRITES=00143507
<========
XSTORE=000016 READS=109416 WRITES=243855 MIGRATES=134423
CPU 00: CTIME=96:56 VTIME=017:43 TTIME=064:50 IO=961712
RDR=000000 PRT=000469 PCH=000000
Look at the READS and WRITES on the 4th line. That is total page reads
and writes.
Put this in a REXX exec, and do a delta after, say 60 seconds. The one
that is changing the most, is the one that is paging the most.
But I don't know what good that information would do. Paging isn't due
a single virtual machine, but rather the sum of the working set size of
all machines vs available storage. Chances are, the largest guest
machine will page the most as it has the most pages to keep in storage.
Tom Duerbusch
THD Consulting
>>> "Martin, Terry R. (CMS/CTR) (CTR)" <terry.mar...@cms.hhs.gov>
2/10/2009 8:04 AM >>>
Hi
I seem to be doing a lot of paging currently on my z/VM 5.3 system I am
running multiple Linux guests including a large Oracle guest (40 GB
memory size). How can I find out 1) who is doing the majority of the
paging and along with that 2) I believe that some of the paging slots
are old data in other words the pages are not going away after a task is
complete how can I research this. The Linux guests have not been
recycled but I thought if they had allocated the slots that after a task
within the Linux guest completed that the slots would be reclaimed. Any
thoughts on all of this would be appreciated.
Thank You,
Terry Martin
Lockheed Martin - Information Technology
z/OS & z/VM Systems - Performance and Tuning
Cell - 443 632-4191
Work - 410 786-0386
terry.ma...@cms.hhs.gov
