From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Mamedov <roman@rm.pp.ru>
Subject: Re: RAID6 and crashes (reporting back re. --bitmap)
Date: Fri, 11 Jun 2010 10:41:34 +0600
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To: Graham Mitchell <gmitch@woodlea.com>
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On Fri, 11 Jun 2010 00:31:57 -0400
"Graham Mitchell" <gmitch@woodlea.com> wrote:

> Can you do this on a live array, or can it only be done (as the docs seem=
 to
> suggest), with the create, build and grow options?

It is a variant of the grow operation, but it can be done on a live array,
even mounted, and completes instantly:

mdadm --grow /dev/md0 --bitmap=3Dinternal --bitmap-chunk=3D131072

In my experience, removing the bitmap (setting it to none) may occasionally
fail (probably when the array has a lot of outstanding write requests), but
just try again when it's a bit quieter, and it'll work.

--=20
With respect,
Roman

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