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Re: How to configure 36 disks ?

To: Raz <raziebe@xxxxxxxxx>
Subject: Re: How to configure 36 disks ?
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Mon, 23 Mar 2009 15:12:57 +0100
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, Linux RAID Mailing List <linux-raid@xxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx, linux-aio@xxxxxxxxx, "linux-ide@xxxxxxxxxxxxxxx" <linux-ide@xxxxxxxxxxxxxxx>
In-reply-to: <5d96567b0903230659t734677a3pb4fd77cccb54008b@xxxxxxxxxxxxxx>
Organization: Intellique
References: <5d96567b0903230659t734677a3pb4fd77cccb54008b@xxxxxxxxxxxxxx>
Le Mon, 23 Mar 2009 15:59:47 +0200
Raz <raziebe@xxxxxxxxx> écrivait:

> 1. redundancy. fair. less likely three disks will break in a single
> raid 2. performance. bad.
> 3. modularity. yes. grows
> 4. Size 24TB

I don't understand why you'd have a bad performance here. I usually
notice a very slight difference between LVM and linux-raid raid0 in all
practical benchmarks. Did you use LVM striping capability? You may
have to adjust readahead (using blockdev --setra) on each
device /dev/dm-X and /dev/md-X) to achieve optimal performance.

Emmanuel Florac     |   Intellique

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