| From: | Greg Smith <greg(at)2ndquadrant(dot)com> |
|---|---|
| To: | Yeb Havinga <yebhavinga(at)gmail(dot)com> |
| Cc: | Francisco Reyes <lists(at)stringsutils(dot)com>, Pgsql performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: 10K vs 15k rpm for analytics |
| Date: | 2010-03-02 21:03:20 |
| Message-ID: | 4B8D7D18.9030407@2ndquadrant.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
Yeb Havinga wrote:
> With 24 drives it'll probably be the controller that is the limiting
> factor of bandwidth. Our HP SAN controller with 28 15K drives delivers
> 170MB/s at maximum with raid 0 and about 155MB/s with raid 1+0.
You should be able to clear 1GB/s on sequential reads with 28 15K drives
in a RAID10, given proper read-ahead adjustment. I get over 200MB/s out
of the 3-disk RAID0 on my home server without even trying hard. Can you
share what HP SAN controller you're using?
--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg(at)2ndQuadrant(dot)com www.2ndQuadrant.us
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