Ben,
on Solaris we had similar performance problems, and we also didn't
find a reason for the problems.

But the good thing is, that (even without a reason) the problems were
gone when we started to use raw devices instead of filesystems. After
weeks of playing with filesystem options we tried to use the disks as
raw devices, and performance since then is ok.
I don't think iSCSI is having a problem with TSM. One of our disk-
shelves is iSCSI-attached to a Windows server, we don't feel any pain
with this device there.

Good luck,
best regards,
Michael

Am 14.05.2007 um 20:00 schrieb Ben Bullock:

        Folks,
        I have a TSM server running on a Sun host running SOL 9, 16GB
RAM, and TSM 5.3.4

        The problem is very poor performance, expire inventory goes
extremely slowly, even archives of 20GB files going to disk or tape
are
very slow. Just slow slow slow.
        But all of the typical things I look at (the bufpool, log wait,
accounting logs, iostat, etc) look ok. No MediaW or IdleW, everything
seems to be in a "Run" state, but going slowly.

        All the storage (DB, LOG and STG) is on ISCSI out to an EMC
Clariion. The disk ~seems~ to be OK, but running a TSM DB and LOG on
iSCSI is a new configuration for us. At the OS side, it doesn't
think it
is waiting for I/O (with an 'iostat' command), but I'm not sure if the
iSCSI protocol may be hiding the i/o waits from the OS, Any comments,
good or bad, from someone running TSM DB & LOG on iSCSI?