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Re: suggestions for postgresql setup on Dell 2950 , PERC6i controller

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: Arjen van der Meijden <acmmailing(at)tweakers(dot)net>
Cc: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, Rajesh Kumar Mallah <mallah(dot)rajesh(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: suggestions for postgresql setup on Dell 2950 , PERC6i controller
Date: 2009-02-16 13:31:37
Message-ID: 87tz6ucxty.fsf@oxford.xeocode.com (view raw or flat)
Thread:
Lists: pgsql-performance
Arjen van der Meijden <acmmailing(at)tweakers(dot)net> writes:

> When we purchased our Perc 5/e with MD1000 filled with 15 15k rpm sas disks, my
> colleague actually spend some time benchmarking the PERC and a ICP Vortex
> (basically a overclocked Adaptec) on those drives. Unfortunately he doesn't
> have too many comparable results, but it basically boiled down to quite good
> scores for the PERC and a bit less for the ICP Vortex.
> IOMeter sequential reads are above 300MB/s for the RAID5 and above 240MB/s for
> a RAID10 (and winbench99 versions range from 400+ to 600+MB/s). 

FWIW those are pretty terrible numbers for fifteen 15k rpm drives. They're
about what you would expect if for a PCI-X card which was bus bandwidth
limited. A PCI-e card should be able to get about 3x that from the drives.

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com
  Ask me about EnterpriseDB's RemoteDBA services!

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