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Date: Thu, 14 Nov 2013 18:06:25 +0400
From: "Andrey V. Elsukov" <ae@FreeBSD.org>
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Subject: [RFC/CFT] Resize support for geom_mirror
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Cc: Pawel Jakub Dawidek <pjd@FreeBSD.org>, trasz@FreeBSD.org
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Hi All,

I prepared the patch, that adds new verb "resize" to the gmirror(8) and
such functionality to the geom_mirror(4).

The main idea is to be able expand the mirror size after replacing all
its components. But reducing the size also is possible.

Also I added g_resize method, and now it automatically writes gmirror's
metadata in the new last sector, when the parent provider changes the siz=
e.

Several notes about implementation:
* `gmirror resize gm0` without exactly specified size will automatically
calculate the maximum possible size for this mirror.

* Reduce the size of the mirror when it is in use is possible only with
debugflags=3D16.

Pawel, please look at the case, when the size of the mirror reduced when
synchronization is in progress. I guess it is enough to change the
condition in g_mirror_sync_request?

The patch is here:
	http://people.freebsd.org/~ae/g_mirror_resize.diff
--=20
WBR, Andrey V. Elsukov


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