In this case, the iSCSI devices are being used as Raw devices, not
filesystems, so filesystem bottlenecks would not be the issue.

Thanks for the brainstorming though.

Ben 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Sims
Sent: Sunday, May 20, 2007 7:03 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Poor TSM server performance on Sun.

On May 20, 2007, at 8:50 AM, Michael Bartl wrote:

> But the good thing is, that (even without a reason) the problems were 
> gone when we started to use raw devices instead of filesystems. ...

Makes one wonder if excessive, delayed file system sync operations were
the issue, in writes.  This might be tested by performing pure read
operations in the file system ('cp SomeFile /dev/null' is a basic test,
versus copying file to file).

   Richard Sims