From: Bruno Wolff III <bruno@wolff.to>
To: Jean-Yves F. Barbier <7ukwn@free.fr>
Cc: Hannes Dorbath <light@theendofthetunnel.de>
Cc: pgsql-general@postgresql.org
Cc: pgsql-performance@postgresql.org
Subject: Re: Arguments Pro/Contra Software Raid
Date: Tue, 9 May 2006 10:18:48 -0500
Message-ID: <20060509151848.GA11476@wolff.to> (raw)
In-Reply-To: <44606A98.4090705@free.fr>
References: <e3pmkc$12mk$1@news.hub.org>
<44606A98.4090705@free.fr>
On Tue, May 09, 2006 at 12:10:32 +0200,
"Jean-Yves F. Barbier" <7ukwn@free.fr> wrote:
> Naa, you can find ATA &| SATA ctrlrs for about EUR30 !
But those are the ones that you would generally be better off not using.
> Definitely NOT, however if your server doen't have a heavy load, the
> software overload can't be noticed (essentially cache managing and
> syncing)
It is fairly common for database machines to be IO, rather than CPU, bound
and so the CPU impact of software raid is low.
> Some hardware ctrlrs are able to avoid the loss of a disk if you turn
> to have some faulty sectors (by relocating internally them); software
> RAID doesn't as sectors *must* be @ the same (linear) addresses.
That is not true. Software raid works just fine on drives that have internally
remapped sectors.
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To: pgsql-performance@postgresql.org
Cc: bruno@wolff.to, 7ukwn@free.fr, light@theendofthetunnel.de, pgsql-general@postgresql.org
Subject: Re: Arguments Pro/Contra Software Raid
In-Reply-To: <20060509151848.GA11476@wolff.to>
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