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Re: Peformance Tuning Opterons/ Hard Disk Layout

From: Michael Adler <adler(at)pobox(dot)com>
To: John Allgood <john(at)turbocorp(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Peformance Tuning Opterons/ Hard Disk Layout
Date: 2005-02-23 18:03:38
Message-ID: 20050223180338.GA4259@pobox.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, Feb 23, 2005 at 11:39:27AM -0500, John Allgood wrote:
> Hello All
> 
>    I am setting up a hardware clustering solution. My hardware is Dual 
> Opteron 550 with 8GB ram. My external storage is a Kingston Fibre 
> channel Infostation. With 14 15000'k 36GB drives. The OS we are running 
> is Redhat ES 3.0. Clustering using Redhat Cluster Suite.  Postgres 
> Version is Postgres 7.4.7. We will be setting up about 9 databases which 
> range in size from 100MB to 2.5GB on the config. The postgres 
> application is mostly read intensive.  What would be the best way to 
> setup the hardrives on this server. Currently I have it partioned with 2 
> seperate raid 5 with 1 failover per raid. I have two database clusters 
> configured with a seperate postmaster running for each. Running two 
> postmasters seems like a pain but that is the only way I knew to 
> seperate the load. I am mostly concerned about disk IO and performance. 
> Is my current setup a good way to accomplish the best performance or 
> would it be better to use all the drives in one huge raid five with a 
> couple of failovers. I have looked around in the archives and found some 
> info but I would like to here about some of the configs other people are 
> running and how they have them setup.

http://www.powerpostgresql.com/PerfList/

Consider a separate array for pg_xlog. 

With tablespaces in 8.0, you can isolate much of the IO in a single
cluster.

 -Mike Adler

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