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Re: swidth in RAID

To: Linux fs XFS <xfs@xxxxxxxxxxx>
Subject: Re: swidth in RAID
From: pg@xxxxxxxxxxxxxxxxxx (Peter Grandi)
Date: Sun, 30 Jun 2013 20:08:35 +0100
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <557F888F-34EA-4669-B861-C0B684DAD13D@xxxxxxxxx>
References: <557F888F-34EA-4669-B861-C0B684DAD13D@xxxxxxxxx>
> I understand swidth should = #data disks.  And the docs say
> for RAID 6 of 8 disks, that means 6. [ ... ] 8 disks/spindles
> working for you and a bit of parity on each. So shouldn't
> swidth equal disks in raid when its concerning distributed
> parity raid?

The main goal is trying to the reduce the probability of
read-modify-write.

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