From: Scott Marlowe <scott.marlowe@gmail.com>
To: Glyn Astill <glynastill@yahoo.co.uk>
Cc: Steve Clark <sclark@netwolves.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Perc 3 DC
Date: Mon, 24 Nov 2008 08:18:18 -0700
Message-ID: <dcc563d10811240718g3fa2e90cja576f422aab0be97@mail.gmail.com> (raw)
In-Reply-To: <193090.19304.qm@web23608.mail.ird.yahoo.com>
References: <dcc563d10811240652g7a511ddye7b2aa2c7d66cbd1@mail.gmail.com>
<193090.19304.qm@web23608.mail.ird.yahoo.com>
On Mon, Nov 24, 2008 at 8:06 AM, Glyn Astill <glynastill@yahoo.co.uk> wrote:
> --- Scott Marlowe <scott.marlowe@gmail.com> wrote:
>
>> >
>> > Yeah the battery is on there, and in the BIOS it says it's
>> "PRESENT" and the status is "GOOD".
>>
>> If I remember correctly, older LSI cards had pretty poor
>> performance
>> in RAID 1+0 (or any layered RAID really). Have you tried setting
>> up
>> RAID-1 pairs on the card and then striping them with the OS?
>>
>
> Not yet no, but that's a good suggestion and I do intend to give it a
> whirl. I get about 27MB/s from raid 1 (10 is about the same) so
> hopefully I can up the throughput to the speed of about one disk with
> sw raid.
>
> For kicks I did try raid 5 on it; 6.9MB/s made it hard to resist
> going to get the hammer, which is still a very attractive option.
Well, I prefer making keychain fobs still, but from a technical
perspective, I guess either option is a good one.
Srsly, also look at running pure sw RAID on it with the controller
providing caching only. I don't expect a PERC 3DC to win any awards,
but the less you give that card to do the better off you'll be.
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To: pgsql-performance@postgresql.org
Cc: scott.marlowe@gmail.com, glynastill@yahoo.co.uk, sclark@netwolves.com
Subject: Re: Perc 3 DC
In-Reply-To: <dcc563d10811240718g3fa2e90cja576f422aab0be97@mail.gmail.com>
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