Re: write/read cache raid5

From: David Chow (davidchow@rcn.com.hk)
Date: Mon Oct 08 2001 - 22:15:42 EST


Alistair Riddell gDG
>
> 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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