Re: Peformance Tuning Opterons/ Hard Disk Layout

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