>I'm more interested in what segment size people use on the disks and if
>a certain pp size is recommended for a volume group under AIX.
If you are creating filsystems or raw volumes down your spindles (ie: NOT
pp extent stripping
across spindnes), the it really doesn't matter what pp size you use. If
you setup pp stripping
across spindles, then I would probably stick with a 4mb or 8mb pp. You
could even go with a 2mb
pp size, but that can really slow down lvm and vg commands.
>From others comments, it seems tsm mirroring is favored over aix/lvm
mirroring. if you choose
TSM mirroring, then I'd put 4 spindnes into 2 vg's of 2 spindles each. I'd
then create a filesystem
or raw volumes in each vg that are extent striped.
If you use aix mirroring, then I'd put all 4 drives into one vg of a 4mb or
8mb pp. I'd
then create filesystem or raw volumes using extent stripping on 2 disks and
a mirror
copy on the other 2 disks. When we use to do Oracle db's on jbod, this was
how
we set them up.
Rick
Oscar Kolsteren
<Oscar.Kolsteren@
INGDIRECT.CO.UK> To
Sent by: "ADSM: ADSM-L AT VM.MARIST DOT EDU
Dist Stor cc
Manager"
<[email protected] Subject
.EDU> Re: 4 spindles for db: best
performing setup
02/19/2009 03:06
AM
Please respond to
"ADSM: Dist Stor
Manager"
<[email protected]
.EDU>
Hi Michael,
I have a similar environment and created two RAID 0 lun's of 2 disks
each. The mirroring is done in TSM itself.
I'm more interested in what segment size people use on the disks and if
a certain pp size is recommended for a volume group under AIX.
Good luck
Best Regards,
Oscar
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Michael Green
Sent: 18 February 2009 20:23
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] 4 spindles for db: best performing setup
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
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