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  3. March 2006

RE: Final word on TSM and V5R4 of i5/os

Jim,

Thank you.

IBM/Tivoli recognized that the PASE api's for tape support were a severe 
bottleneck for tape drive performance of TSM under PASE.  Do you have any 
performance data from someone who has moved from PASE to Linux?  Like, 
what used to get x bytes/hour now gets y bytes/hour?  I would never expect 
performance of TSM to equal a native SAV... command because of all the 
extra logging, etc.  However, TSM PASE takes about 6 hours to fill a 
3582-L23 tape (BACKUP STGPOOL).  That's a big yawner compared to an hour 
and 10 minutes of the native SAV commands.

I was hoping that IBM would fix the PASE api's.  But IBM is sinking no 
dollars into PASE.  Their only goal is to sucker vendors into using PASE 
as an easy way to port their applications over to i5/os.  Perhaps this is 
why TSM gave up on PASE?

Rob Berendt

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