Message-ID: <4E53AE63.5040305@boreham.org>
Date: Tue, 23 Aug 2011 07:42:59 -0600
From: David Boreham <david_list@boreham.org>
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To: pgsql-performance@postgresql.org
Subject: Re: RAID Controllers
References: <4E5313B0.6000004@boreham.org> <4E538BAC.4050904@missouri.edu>
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On 8/23/2011 5:14 AM, Robert Schnabel wrote:
>
> I'm by no means an expert but it seems to me if you're going to choose 
> between two 6 GB/s cards you may as well put SAS2 drives in.  I have 
> two Adaptec 6445 cards in one of my boxes and several other Adaptec 
> series 5 controllers in others.  They suit my needs and I haven't had 
> any problems with them.  I think it has been mentioned previously but 
> they do tend to run hot so plenty of airflow would be good.

Thanks. Good point about airflow. By SAS I meant 6Gbit SAS drives. But 
we have many servers already with 10k raptors and it is tempting to use 
those since we would be able to use a common pool of spare drives across 
all servers. 15K rpm is tempting though. I'm not sure if the DB 
transaction commit rate scales up linearly when BBU is used (it would 
without BBU).