Re: write/read cache raid5

From: Alistair Riddell (ali@gwc.org.uk)
Date: Tue Oct 09 2001 - 04:06:24 EST

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On Tue, 9 Oct 2001, David Chow wrote:

> 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.

In that case more memory will certainly help. You might like to check out
Jens Axboe's block-highmem patch if you have more than 1GB of RAM. It
allows hardware to DMA direct to high memory, rather than using bounce
buffers, which can increase performance considerably.

-- 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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