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Re: Performance query about large tables, lots of concurrent access

From: Scott Marlowe <smarlowe(at)g2switchworks(dot)com>
To: Andrew Sullivan <ajs(at)crankycanuck(dot)ca>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Performance query about large tables, lots of concurrent access
Date: 2007-06-21 23:11:04
Message-ID: 467B0588.5080500@g2switchworks.com (view raw or flat)
Thread:
Lists: pgsql-performance
Andrew Sullivan wrote:
> On Thu, Jun 21, 2007 at 12:29:49PM -0400, Karl Wright wrote:
>   
>> I checked the disk picture - this is a RAID disk array with 6 drives, 
>> with a bit more than 1Tbyte total storage.  15,000 RPM.  It would be 
>> hard to get more/faster disk than that.
>>     
>
> What kind of RAID?  It's _easy_ to get faster disk that 6 drives in
> RAID5, even if they're 15,000 RPM.  The rotation speed is the least
> of your problems in many RAID implementations.

Oh, and the driver rev means a lot too.  Some older driver revisions for 
some RAID cards are very slow.

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