| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Chris Ruprecht <chris(at)ruprecht(dot)org> |
| Cc: | Francisco Reyes <lists(at)stringsutils(dot)com>, Pgsql performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: RAID controllers for Postgresql on large setups |
| Date: | 2008-05-13 04:40:15 |
| Message-ID: | 48291BAF.1040807@commandprompt.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Chris Ruprecht wrote:
> Joshua,
>
> did you try to run the 345 on an IBM ServeRAID 6i?
No the only controllers I had at the time were the 2120 and the LSI on
board that is limited to RAID 1. I put the drives on the LSI in JBOD and
used Linux software raid.
The key identifier for me was using a single writer over 6 (RAID 10)
drives with the 2120 I could get ~ 16 megs a second. The moment I went
to multiple writers it dropped exponentially.
However with software raid I was able to sustain ~ 16 megs a second over
multiple threads. I stopped testing at 4 threads when I was getting 16
megs per thread :). I was happy at that point.
Joshua D. Drake
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