From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: Chunk size change stop/restart
Date: Wed, 18 Dec 2013 09:32:10 +1100
Message-ID: <20131218093210.46a208a2@notabene.brown>
References: <20131217190019.GA1883@lazy.lzy>
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To: Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>
Cc: linux-raid@vger.kernel.org
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On Tue, 17 Dec 2013 20:00:19 +0100 Piergiorgio Sartor
<piergiorgio.sartor@nexgo.de> wrote:

> Hi all,
>=20
> I started the process of changing the chunk
> size of a RAID-5 array (5 HDDs).
>=20
> Unfortunately, I unwisely choose a quite slow
> device for the backup file.
>=20
> Is it possible, without stopping the array, to
> stop the "reshape", move the backup file to a
> faster place and restart the process?

You might be able to kill the mdadm which over-sees the reshape, move the
file, then use --grow --continue to continue the reshape.
But I've never tested this and suspect that something would go wrong.

Stopping, moving, and re-assembling should work.

Being patient also works,  but can be very difficult.

NeilBrown

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