Re: Advice needed for EMC CX500 setup

Hi Brion,

I see that no one else has responded . . . . . let me stir up the waters
and
see what shakes loose . . .

You don't inidicate the the number of nodes, db objects (files), backup
rate (gb/day), etc, etc
that you expect.  This is key.  You indicate a db of 70 gb with a full
sized log - this means to
me that you expect heavy db activity.  For the tsm db, or for any other db
for that matter, the
question is how many iops do you need?  The 133gb fc disk drive can
probably give you
around 120+ iops.  I'm afraid that a 3 spindle raid 5 probably is not
enough iops to
run tsm instance with the activity you might have.

Before my time on the storage team, Emc sold a disk subsystem to us for one
of our
TSM servers.  It was a Clariion with all big drives.  Like most disk
purchases, it was
configured on capacity, not i/o load.  There was no way to split the drives
between db/log and staging pools and have enough disk space for staging
pools, or,
enough spindles for db/log.  The only way to make it work was to spread
db/log/pools
across all the spindles.  NOT good . . . . actually, it worked quite well
for the first year.

Rick








                      PAC Brion Arnaud
                      <Arnaud.Brion@PAN        To:       ADSM-L AT VM.MARIST 
DOT EDU
                      ALPINA.COM>              cc:
                      Sent by: "ADSM:          Subject:  Advice needed for EMC 
CX500 setup
                      Dist Stor
                      Manager"
                      <[email protected]
                      .EDU>


                      06/06/2005 01:13
                      PM
                      Please respond to
                      "ADSM: Dist Stor
                      Manager"






Hi list,

I need some guidance for setup of a brand new EMC array, equipped with
10 FC drives, 133GB each. TSM server (5.3.1) will be running on AIX 5.3.
My goal is to use those disks for following purposes :
- TSM DB 70 GB
- TSM log 13 GB
- TSM primary pools : all of the remaining space

Questions :

1) EMC recommands using RAID3 for disk to disk backup -> should I create
2 raid groups : one raid5 for TSM DB and logs, one raid3 for diskpools ?

2) if using raid5 for DB and log, should I create 2 raid groups, each
one using different physical disks : one for the DB, the other for the
logs, or is the performance penalty neglectible if both are on the same
disks ?
3) I plan using raw volumes for DB and LOGS (no TSM or AIX mirroring, I
trust EMC's raid): what is the best setup : 1 big TSM volume or several
smaller ?  If using several volumes should they be built using different
LUN's, or could I create several LV's on the same LUN.

So many possibilities, that I'm a bit lost ...  So if you have good
experience in this domain, your help will be welcome !
TIA.
Cheers


Arnaud

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