Michael,

Raid 1, only primary copies.  Save the space for conversion to TSM 6 which
does not support TSM level database mirroring,

Steve

Steven Harris,
TSM Admin, Sydney Australia





             Michael Green
             <mishagreen@GMAIL
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             Sent by: "ADSM:           ADSM-L AT VM.MARIST DOT EDU
             Dist Stor                                                  cc
             Manager"
             <[email protected]                                     Subject
             .EDU>                     [ADSM-L] 4 spindles for db: best
                                       performing setup

             19/02/2009 07:22
             AM


             Please respond to
             "ADSM: Dist Stor
                 Manager"
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                   .EDU>






You are given 4 spindles to place TSM DB on them.
How would you set them up to squeeze maximum performance for DB?

1. Dedicate each spindle for a DBC (result: 3 DBCs, one spindle left
out, nevermind)
2. Create RAID 0 out of each pair of disks. Place a DBC on each RAID
(result: 2 DBCs on two separate RAID 0)
3. Create RAID 1 out of each pair of disks. Place a DBC on each RAID
(result: 2 DBCs on two separate RAID 1)
4. Create RAID 5 out of all spindles. Place one DBC on the RAID
(result: 1 DBC on RAID5)

Notes:
a. There is no RAID 0+1
c. Wasted space is not a concern
--
Warm regards,
Michael Green