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Re: swidth with mdadm and RAID6

To: Linux XFS <linux-xfs@xxxxxxxxxxx>
Subject: Re: swidth with mdadm and RAID6
From: pg_xfs@xxxxxxxxxxxxxxxxxx (Peter Grandi)
Date: Sat, 16 Sep 2006 00:49:34 +0100
In-reply-to: <Pine.LNX.4.10.10609151652070.31539-100000@xxxxxxxxxxxxxxxxxxxxxxx>
References: <Pine.LNX.4.10.10609151652070.31539-100000@xxxxxxxxxxxxxxxxxxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
>>> On Fri, 15 Sep 2006 17:07:07 -0400 (EDT), Steve Cousins
>>> <cousins@xxxxxxxxxxxxxxxxxxxxxxx> said:

cousins> I have a RAID6 array of 11 500 GB drives using mdadm.
cousins> There is one hot-spare so the number of data drives is
cousins> 8.  I used mkfs.xfs with defaults to create the file
cousins> system and it seemed to pick up the chunk size I used
cousins> correctly (64K) but I think it got the swidth wrong.

Worrying about the impact on performance of a relatively small
thing like 'swidth' for something like an 8+2 RAID6 is quite
funny. http://WWW.BAARF.com/


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