[HPADM] RE: Clarification on swapinfo/glance output
From: Kenneth and Maythe Ray (kray_at_sbcglobal.net)
Date: 01/14/04
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To: "'Naylor, Jim'" <Jnaylor@Schnucks.com>, "'Hpux-Admin@Dutchworks. Nl (E-mail)'" <hpux-admin@dutchworks.nl> Date: Tue, 13 Jan 2004 23:09:07 -0600
Seems to me you need to increase your swap by adding another device swap, it
seems that your Oracle instance is needing to reserve more swap area. The
memory line of swapinfo isn't actually physical memory it is pseudo swap.
Other than the memory line showing up in the swapinfo command you can also
see that your system has pseudo swap turned on by looking at the kernel
parameter swapmem_on. If you run kmtune -q swapmem_on it should be set
to 1. You might want to search for pseudo swap to get a good understanding
of what it is, but in short it is about 75% of your physical RAM that is
magically available so processes can reserve space for starting. The key
thing is that it actually doesn't take up any of your physical
memory....again you should read about it.
I think creating another device swap that is probably about 1.5 times the
size of the actual physical memory you have should help, also you might need
to adjust some of the Oracle SGA parameters to be more inline with the
amount of physical memory you have on the system.
If I had that occuring that's where I'd start....
-----Original Message-----
From: hpux-admin-owner@DutchWorks.nl
[mailto:hpux-admin-owner@DutchWorks.nl]On Behalf Of Naylor, Jim
Sent: Tuesday, January 13, 2004 3:31 PM
To: Hpux-Admin@Dutchworks. Nl (E-mail)
Subject: [HPADM] Clarification on swapinfo/glance output
Hello All,
I have been reading several entries in the archives explaining the output of
swapinfo in regards to memory and device swap but apparently I am having a
mental block because I can't seem to comprehend the explanations. Here is
my output form swapinfo -t:
# swapinfo -t
Kb Kb Kb PCT START/
Kb
TYPE AVAIL USED FREE USED LIMIT
RESERVE PRI NAME
dev 2097152 0 2097152 0% 0
- 1 /dev/vg00/lvol2
reserve - 1468224 -1468224
memory 3299740 1220268 2079472 37%
total 5396892 2688492 2708400 50% -
0 -
Before re-booting this machine the "memory" line showed 100% and the "dev"
seems to always show 0% as if it is never using the device swap space. With
"dev" line at 0% I am getting errors from oracle saying out of space and
eventually the system is un-usable. In glance it shows swap at 100% (40% of
it is "R" I assume for reserved) and memory in glance was showing 76%. If
someone could explain this output in layman's terms or point me to a white
paper that could explain it, I would greatly appreciate it.
Thanks,
Jim Naylor
Unix Systems Administrator
Schnuck Markets, Inc.
* Direct: (314) 994-4784
*)) Cell: (314) 691-0186
* Fax : (314) 994-4684
* jnaylor@schnucks.com
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- Previous message: Joe Brancaleone: "[HPADM] SUMMARY: Memory checksum Errors in rp2470"
- In reply to: Naylor, Jim: "[HPADM] Clarification on swapinfo/glance output"
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