Message-ID: <3BC26BDE.45D893A6@rcn.com.hk>
Date: Tue, 09 Oct 2001 11:15:42 +0800
From: David Chow <davidchow@rcn.com.hk>
Organization: Resources Computer Network Ltd.
MIME-Version: 1.0
To: Alistair Riddell <ali@gwc.org.uk>
CC: raid@ddx.a2000.nu, linux-kernel@vger.kernel.org,
        linux-raid@vger.kernel.org
Subject: Re: write/read cache raid5
In-Reply-To: <Pine.LNX.4.21.0110082213240.29428-100000@frank.gwc.org.uk>
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Sender: linux-kernel-owner@vger.kernel.org

Alistair Riddell ?g?D?G
> 
> On Mon, 8 Oct 2001 raid@ddx.a2000.nu wrote:
> 
> > So there is no way i can Speedup write to the raid5 array ?
> > (memory will be ecc and the server will be on ups)
> 
> Your disks go as fast as they go, that is a physical limitation.
> 
> More RAM means your server can store up data blocks to be written when the
> disks are less busy. But the data still has to be written to disk
> sometime.
> 
> More RAM will certainly help by caching reads though.
> 
> 6 disks raided together means the bottleneck will likely be your network,
> unless your server is on gigabit ethernet and has a ton of clients and/or
> gigabit to the desktop.
> 
> --
> Alistair Riddell - BOFH
> IT Manager, George Watson's College, Edinburgh
> Tel: +44 131 447 7931 Ext 176       Fax: +44 131 452 8594
> Microsoft - because god hates us
> 
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Yes my server serve lots of clients and have lots of NICs even
gigabit... how can I increase write/read cache on RAID5 ? It is better
performed when big cache allows on top (before) raid computation work
and physical disk writes.
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