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Re: Pulling disk out of the RAID 5 Array?

To: <linux-xfs@xxxxxxxxxxx>
Subject: Re: Pulling disk out of the RAID 5 Array?
From: "Steve Wolfe" <nw@xxxxxxxxx>
Date: Tue, 18 Dec 2001 14:11:46 -0700
References: <Pine.A41.4.33.0112181249510.84718-100000@dante38.u.washington.edu> <1008709221.3599.2.camel@UberGeek>
Sender: owner-linux-xfs@xxxxxxxxxxx
> Secondly, the choice to make next is hardware or software raid. Hardware
> raid is nice because the OS handles less, or none, of the burden of
> rebuilding the array should a failure occurr.

  One more note, in a RAID 5 configuration, the hardware controller will
also do the checksumming, removing that task from the CPU as well - and
the checksumming can be considerable on heavy writes.  Myself, I would not
use software RAID 5 on a machine unless it either had very little CPU
usage, or had multiple processors.  Levels 1 and 0, though, are different
matters.

steve



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