Hey Paul,

> Paging is a bad thing, but why would an AIX system page (like crazy)
under
> this configuration?
>
> P660-6H1 2GB Memory
> dsmserv using 384MB
> Swap space is 3GB an only 12% used.
> Nothing else seems to use much memory based on a ps -efl
>
> An old MVS person like myself would say somehow something has a free page
> target that is really high.  iostat and vmstat seem OK.
>
> Any AIX gurus know the answer?

Is this AIX v4 or v5? Are you using JFS files for TSM DB/Log,
disk storage pool volumes or raw logical volumes? The reason
I ask, under AIX, most (almost all) I/O to JFS files goes
through the virtual memory manager, and will cause the "pgin"
and "pgout" in tools like monitor to clock up, from what I
understand. AIX v5 adds some caching hints to file operations,
which (I believe) newer versions of TSM utilise, which
probably change this behaviour.

The paging "pi"/"po" listed by vmstat, or "pgsin"/"pgsout" in
monitor is more like the real paging - if these are high, then
there is real memory contention. If this is the case, a vmtune
might be in order. Some of our 8 GB RAM RS/6000s have a line
like the following in the startups, without, they thrash like
mad:
  /usr/samples/kernel/vmtune -p 3 -P 8 -b 200

Cheers,
Paul Ripke
UNIX/OpenVMS Sysadmin
CSC, Port Kembla 2502, NSW, Australia
Phone +61 2 4275 4101
Fax +61 2 4275 7801
Mobile +61 419 432 517
101 reasons why you can't find your Sysadmin:
68. It's 9 AM. He/she is not working that late.
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