Patrick wrote:

> Hi all,
>
> I have question about what configuration folks have used for RAID on
> their servers. We bought a Dell 2950 Poweredge with 2 Intel Xeon 5150
> Dual Core processors and 4GB of memory. We have 6 146GB, 15k RPM SAS
> disks. OS will be RHEL 4AS and we have PERC 5/i as our RAID controller.
> The question is; what is the optimal RAID config for the webserver using
> Postgres as a database? Your experiences, positive and negatives would
> be appreciated.
>
> Thanks,
> Patrick
>


It depends how much disk space you actually need.

For fastest reads RAID 1+0 would probably be best. Stripe the data across 2
disks and mirror each twice. You would only have 292GB of space but read
speeds would be almost 6 x single disk reads.

With those disks you'd get a sustained 350MB/s unbuffered reads.


--
Brian Wakem