Re: Postgresql on software RAID

From: Adam Witney <awitney(at)sghms(dot)ac(dot)uk>
To: Sean Chittenden <sean(at)chittenden(dot)org>
Cc: pgsql-admin <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Postgresql on software RAID
Date: 2003-12-18 11:01:33
Message-ID: BC07398D.2A6FD%awitney@sghms.ac.uk
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On 18/12/03 5:39 am, "Sean Chittenden" <sean(at)chittenden(dot)org> wrote:

>> I am experimenting with a few OS's for my new hardware. I plan to have a
>> software RAID5 device for my pgsql data directory.
>>
>> I have been experimenting with FreeBSD and with Linux, does anyone have any
>> thoughts on whether vinum RAID devices are better than Linux software RAID?
>> Or vice versa... Or no difference at all? Any gotchas I should bear in mind?
>
> You have to be more specific than just software RAID... IDE software
> RAID helps with reliability, but it's murder on performance. Only one
> command can be issued at a time with IDE, so your performance of RAID
> 1 is going to be half that of just writing to a single device. SCSI
> on the other hand... SCSI is the only way to go if you're serious
> about databases. -sc

These are Dell Poweredge 1750 and 2650 servers with SCSI disks

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