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Ideal disk setup for Postgresql 7.4?

From: Steve Poe <spoe(at)sfnet(dot)cc>
To: pgsql-performance(at)postgresql(dot)org
Subject: Ideal disk setup for Postgresql 7.4?
Date: 2005-01-25 11:57:24
Message-ID: 41F63424.1060904@sfnet.cc (view raw or flat)
Thread:
Lists: pgsql-performance
I help manage an animal hospital of 100-employees Linux servers. I am 
new to database setup and tuning, I was hoping I could get some 
direction on a setting up drive array we're considering moving our 
database to.

They're currently on a two-disk Adaptec RAID1 with Postgresql 7.4.2.

The drive array is a 7-disk fibre channel on a Qlogic 2100 controller. I 
am currently testing RAID5 (sw).

The main reason of moving to a drive array is the high level of context 
switches we get during the day (>30K for 20 mins per hour). The OS and 
database exist on the same disk but seperate parition (which probably 
makes little difference)


additional info:

On average, 30-35 vets/doctors are connecting to the database at any 
time from 7am - 7pm. The database is very active for the small company.

Server Info:
Centos 3.3 (RHEL 3.x equivelent)
4GB RAM
Adaptec 2100S RAID
Qlogic QLA2100 Fibre

Any feedback/suggestions are greatly appreciated.

Thanks.

Steve Poe



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