I am also curious to see what your settings are for AIXDIRECTIO
and AIXSYNCIO. For JFS2 only, we recommend that the AIXDIRECTIO setting be
YES and AIXSYNCIO be set to no. In general, we see that if the direct i/o
is set to yes, then JFS2 is roughly equal to RLV (raw logical volumes) in
terms of performance. These settings apply to JFS2 ONLY.


At 09:36 AM 9/21/2004 -0500, you wrote:

Well, interesting results from the changes we made to our vmtune settings
yesterday. We have one TSM instance running with JFS2 for database, logs
and storage pools, and another on all raw. We run two database backups
daily, a full and a snapshot. Last evening's snapshot was 5,000,000 pages
an hour faster on the JFS2 TSM instance than any previous DB backup we've
had. It was about the same speed as a backup on the server using raw
volumes. Of course, one night doesn't mean a whole lot in the big scheme
of things. But if this continues, I'll be impressed.

Curtis
curtis.stewart AT lawson DOT com

Dave Canan
TSM Performance
IBM Advanced Technical Support
ddcanan AT us.ibm DOT com