Shouldn't be a problem, as long as you continue to use TSM mirroring for
all parts of it.
There have been lively debates as to whether TSM mirroring, OS
mirroring, or hardware/microcode RAID is best for the database. Some
combinations are known to be dangerous for data integrity - OS mirroring
on raw volumes. And RAID5 can actually hamper TSM database performance.
But since you are using TSM mirroring, you are safe from the standpoint
of integrity, and you are at least "pretty good" from the standpoint of
performance. I myself have futzed around with all kinds of combinations,
enough to call it a hobby, but at the moment I'm back to using TSM
mirroring because I need its flexibility in spreading out the database
across different disk architectures and different OS structures such as
AIX Volume Groups.
TSM's disk storage pools are 50% write, and so are not a good candidate
for RAID5 either. It will cost some disks, but you'll find that
switching these to mirroring will speed up client backups. You can buy a
pre-owned A1000 array (IBM'ers: very similar to SSA) for the cost of
tickets to a ballgame and a sack of peanuts these days, so why not just
get more?
Roger Deschner University of Illinois at Chicago rogerd AT uic DOT edu
====== "If you're a UNIX user, all UNIX are pretty much the same. ======
== If you're a UNIX programmer, all UNIX are a little bit different. ===
== If you're a UNIX system admin, all UNIX are completely different!" ==
== --Bob Koehler, Hubble Space Telescope Payload Flight Software Team ==
On Thu, 26 May 2005, Farren Minns wrote:
>Morning all
>
>Running TSM 5.1.6.2 on Solaris.
>
>At present I am running the TSM server on a Sun E250 server with 4 internal
>17GB disks. Two of them are used for the OS ( software mirrored ) and the
>other two are used to house the TSM database and log volumes ( using TSM
>mirroring ). At the moment the database is 75% utilised and I don't have
>much free space to expand it if necessary. However, I do have a couple of
>free disks in an attached A1000 array ( which also houses our 50GB RAID5
>backup pool) and I was thinking of creating a new db volume and mirror on
>these. Is there any reason why this may be a bad idea i.e. having some
>parts of the db on internal disks and some on the array. Will I see
>degraded performance because of this etc?
>
>Thanks in advance for any advice
>
>Farren Minns
>John Wiley & Sons Ltd
>
>
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