I would suggest you contact EMC.  I believe they have information about
setting up a clariion for TSM.

A couple comments from things I've heard from EMC. . . . .

EMC used RAID3 in their VTL, and is best for streaming when ATA drives are
used, for
up to about 10 concurrent read/write data streams.    RAID5 is best
for streaming with NON-ata drives.

EMC has stated a bunch of times that you should not change the default 64k
strip size
without talking to EMC support (you indicated you weren't, so good).  There
are internal
software design issues that make this optimal.

rick





             Andy Huebner
             <Andy.Huebner@ALC
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             Sent by: "ADSM:           ADSM-L AT VM.MARIST DOT EDU
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             Manager"
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             .EDU>                     Disk config question - Block size


             02/09/2006 06:34
             PM


             Please respond to
             "ADSM: Dist Stor
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I am preparing a Clariion CX-300 for TSM disk pools.  TSM will be the
only system so I can tune it from end-to-end.
There will be two 4+1 RAID5 groups holding the disk pools.  RAID5 or
RAID3 are the only choices due to the number of disks that were
purchased and the amount of space that I need.

The settings we are considering:
Element size of 64k.  This means a 256k write from TSM is one stripe.
Cache block size of 16k.  Larger I/Os for the disk pools larger cache
blocks should work better.
AIX Logical Volume block size of 64k.  This will match the element size.

Has anyone done this type of tuning and been able to test variations?


Andy Huebner


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