| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Francisco Reyes <lists(at)stringsutils(dot)com> |
| Cc: | Pgsql performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: RAID controllers for Postgresql on large setups |
| Date: | 2008-05-13 02:11:18 |
| Message-ID: | 20080512191118.1b40324b@jd-laptop |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Mon, 12 May 2008 22:04:03 -0400
Francisco Reyes <lists(at)stringsutils(dot)com> wrote:
> Inheritted a number of servers and I am starting to look into the
> hardware.
>
> So far what I know from a few of the servers
> Redhat servers.
> 15K rpm disks, 12GB to 32GB of RAM.
> Adaptec 2120 SCSI controller (64MB of cache).
>
> The servers have mostly have 12 drives in RAID 10.
> We are going to redo one machine to compare RAID 10 vs RAID 50.
> Mostly to see if the perfomance is close, the space gain may be
> usefull.
Most likely you have a scsi onboard as well I am guessing. You
shouldn't bother with the 2120. My tests show it is a horrible
controller for random writes.
Comparing software raid on an LSI onboard for an IBM 345 versus a 2120s
using hardware raid 10, the software raid completely blew the adaptec
away.
Joshua D. Drake
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