Hi Guru's

I have recently installed a new TSM 4.1.3 server on a P600 and AIX 4.1.3. I
have 2*75Gybyte RAID5 Disk Cache attached through SSA. The performance for
reading from disk to tape is fine for small files, but I only get 2.5MB/Sec
when files are larger than say 1Gbyte. I have set "SELFTUNETXNsize   Yes",
and it brought it up tothis speed when using two drives.

I have 18 *4Gbyte files on each RAID5 and can see that the data is evenly
distributed in each file. I can see that the file say 7Gbytes is spread
throughout many of the Disk Storage Volumes. I don't want to go straight to
tape as this causes a huge headache in scheduling.

Is this a known bottleneck or is there a way around to get at least
20MB/Sec?

Kind Regards
Mike Wiggan, TCS/31
Infrastructure Integration Specialist
Petroleum Devlopment Oman LLC
(michael.ma.wiggan AT pdo.co DOT om)