ADSM-L

Re: storage pool raid 1?

2004-07-21 17:49:01
Subject: Re: storage pool raid 1?
From: Troy Frank <Troy.Frank AT UWMF.WISC DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 21 Jul 2004 16:48:01 -0500
As far as I know, the only "requirement" for diskpool is to be big
enough to hold 1 day worth of change-data.   Obviously, more is better
(to a point).  We've got a 900GB cache right now, which affords us about
8 days worth of data.  We still migrate to tape everyday though.
Whether or not you need to RAID the cachepool is kind of a case-by-case
basis.   In our case, we could afford to lose one day of data out of the
cache if a disk failed.  The only exception to that is a few big files
that go straight to tape anyway.


>>> raclark AT REGENCE DOT COM 7/21/2004 4:25:07 PM >>>
Many shops have the storage pools built on storage where non-raid is
not an
option.

It would be nice to see some storage pool volume sizing
reccomendations
that don't assume everyone is on 9GB SSA JBOD.

Seeing TSM become SFS and SVC aware would be nice as well.

[RC]





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< ADSM-L AT VM.MARIST DOT EDU Subject: Re: storage pool raid 1?
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07/21/2004 01:37 PM
Please respond to
"ADSM: Dist Stor
Manager"

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==> In article
< OF3E4591C3.59EF37FE-ONC1256ED8.004B7645-C1256ED8.004BDA31 AT exist DOT se
>,
Daniel Sparrman < Daniel.Sparrman AT EXIST DOT SE > writes:


> I've seen occasions when disks have failed on a TSM server, and a
user
calls
> to have a single Word document retrieved. You want to be the one
explaining
> to the user that the disk on the backupserver has failed, and that
his/hers
> document cannot be restored? :=)


"Me too."


Additionally, there are increasing amounts of data stored on TSM which
are
not
even "just backups".

If you use the DB2 archive log transfer facilities, then between the
time
you
run the log upload and the next time you complete a stgpool backup,
your
DASD
has the only copy of that data in the universe. With a RAID-5 in place
and
a
hot spare, I don't feel too much angst about this, but unmirrored
would
squick
me for sure.

We also use TSM as a data store for our content management
application;
That
DASD is in fact the primary data. must must MUST be raided.


- Allen S. Rout





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