Re: Best Practices DISK for DB, LOG, and STGPOOL && JigSaw Puzzle

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Thu, 14 Sep 2006 11:20:37 -0400

On Sep 14, 2006, at 10:59 AM, Bernaldo de Quiros, Iban 1 wrote:

Hi Richard,

There's a lot of great stuff here and good advices !!

But I have two last questions...
1-Will you share the same physical disk with database and storagepool ¿?

Never mix conflicting access-pattern subsystems in storage areas -that can be as bad as tape and disk on the same I/O path. It isessential that your database be as high-performance as possible, sokeep it separate.

2-Will you spread database volumes over the same physical disk orover different physical disks ¿? Or will you make both ¿?

In a non-RAID environment, I would spread over physical disks, to theextent reasonable. If very large disks, you may want a fewpartitions on the disk; but then try to use 15,000 rpm disks. But Iprefer using raw logical volumes and hardware RAID 1+0 (striping andmirroring) for best performance. And beyond that there aresophisticated disk subsystems out there which offer furtheropportunities. Remember that TSM uses one thread per disk volume, soyou gain by having a reasonable number of volumes.

Look back in the List archives for information posted from the hard-won experiences of other contributors, as there's lots of good advicein our collective efforts.


   Richard Sims

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