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Re: San Performance gurus

From: Brian Haas <>
Date: Thu, 24 Apr 2003 11:27:52 -0800
Message-ID: <>

Sarnowski, Chris wrote:

> We've got a Hitachi 9960, and have done all of our striping at
> the hardware level. The database is sharing the same disks as
> several large flat-file systems (e.g. Genbank databases used
> for BLAST). We're using Veritas, but not using it to do any
> RAID or striping. We're using Quick I/O for the DB but I'm
> not convinced that it makes much of a difference in our
> environment.

We are using a Sun branded Hitachi 9970 with veritas. The san presents 30 luns(disks) to the sun host. The Datawarehouse load was going slower than we had hoped on the new hardware. Sun professional services said to use veritas striping across the 30 logical luns. It made a world of difference once we did this. I'm not sure how the disks are set up on the san, but I know there are only 18 physical disks in raid 5 I believe. Not using quick/io, but the newer ODM that comes with the latest version of veritad database edition. I'm not sure how it compares   to quickio.

> I can't tell you much about the actual setup (stripe width,
> write cache, etc). I just know that back in the days when I
> was SA/DBA, and the database sat on 5 or 6 different
> volumes (each a separate RAID set), I had to juggle files to
> reduce disk contention, and it was a big pain. Now I don't,
> and neither does the current SA. We've both got plenty of other
> work to do.

>>-----Original Message-----
>>From: Spears, Brian []
>>Sent: Wednesday, April 23, 2003 6:07 PM
>>To: Multiple recipients of list ORACLE-L
>>Subject: RE: San Performance gurus
>>Chris, what is your type of SAN are you using?
>>-----Original Message-----
>>Sent: Wednesday, April 23, 2003 12:37 PM
>>To: Multiple recipients of list ORACLE-L
>>I'm not sure I understand the question (but I'm not a
>>SAN guru either). We run our database on a SAN,
>>and we also use SAME (more or less; see below). The two
>>concepts aren't necessarily related (though I'd guess
>>it's easier to use SAME on a SAN rather than otherwise).
>>We're running RAID 5 without apparent ill effects. We spend
>>a lot more time reading than writing. We're also in a situation
>>(shared by many others, I understand) where tuning a query
>>can have a dramatic effect on performance, and I/O tweaks
>>are pretty ho-hum by comparison.
>>Maybe I'm misusing the acronym SAME - I've always used
>>it somewhat casually - that is, I assume that building
>>across several RAID-5 sets, rather than across RAID 1
>>or 10 or 0+1, gives an acceptable amount of protection
>>against hardware failure. The one thing I've fought for
>>is to have a separate volume, on top of physically
>>separate disks, for multiplexing of redo and control files.
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  * Brian Haas            *
  * Database Administrator    Musician's Friend, Inc.        *
  * Phone:(541)774-5211 *

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Received on Thu Apr 24 2003 - 14:27:52 CDT

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