From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neil Brown <neilb@suse.de>
Subject: Re: Linux RAID migration
Date: Thu, 9 Aug 2007 13:23:50 +1000
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In-Reply-To: message from saeed bishara on Tuesday August 7
Sender: linux-raid-owner@vger.kernel.org
To: saeed bishara <saeed.bishara@gmail.com>
Cc: Tuomas Leikola <tuomas.leikola@gmail.com>, linux-raid@vger.kernel.org
List-Id: linux-raid.ids

On Tuesday August 7, saeed.bishara@gmail.com wrote:
> > >   mdadm --grow /dev/md0 --raid-disks=3
> the mdadm --grow supports saving backup file that can be used to
> re-assemble the array in case of crash during the "critical section".
> Any idea what is the size of file? or is there any upper limit in the
> case of array of 5 drives?

The file size depends on the chunk size and the number of disks.

I think for 5 disks it would be less than 30 times the chunk size, so
for a 128K chunk, it would be under 3 Meg.

NeilBrown