Subject: Re: 3ware RAID controller slow?
To: Jukka Marin <jmarin@embedtronics.fi>
From: Michael van Elst <mlelstv@serpens.de>
List: netbsd-users
Date: 10/28/2007 23:43:16
On Mon, Oct 29, 2007 at 12:04:47AM +0200, Jukka Marin wrote:

> Then why is RAID5 slow and a plain disk isn't (when extracting the same
> pkgsrc tarball)?  I'm trying to find out whether I can use RAID5 or not,
> that's why I'm asking ;)

RAID5 can be slow when you don't write full stripes, but even then
it is usually not much slower than a single drive.

Some RAID controllers are also very slow when you disable the
write cache. Can you verify your setup?


-- 
                                Michael van Elst
Internet: mlelstv@serpens.de
                                "A potential Snark may lurk in every tree."