Re: 10K vs 15k rpm for analytics

From: Scott Marlowe <scott(dot)marlowe(at)gmail(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 21:34:49
Message-ID: dcc563d11003021334nc2e9505ued5d248562e70d1e@mail.gmail.com
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On Tue, Mar 2, 2010 at 1:51 PM, Yeb Havinga <yebhavinga(at)gmail(dot)com> 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. So I'd go for the 10K
> drives and put the saved money towards the controller (or maybe more than
> one controller).

That's horrifically bad numbers for that many drives. I can get those
numbers for write performance on a RAID-6 on our office server. I
wonder what's making your SAN setup so slow?

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