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Date: Mon, 13 Aug 2007 14:10:46 -0400
From: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
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Subject: Re: [linux-lvm] Some questions on "Mirrors cannot be resized while
	active yet"
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Jonathan Brassow wrote:
> I don't remember all the reasons, but I *think* two of them were:
> 1) 186304 - potential to spoil redundancy
> 2) cluster mirroring needed ability to hold to identical logs for a
> short period

Maybe not a reason why it's disabled, but I think kernel code
needs to change to allow LVM mirror resizing.

LVM2 uses 'noflush' option for suspending mirror maps.

OTOH, currently you need full (flushing) suspend to resize device.
http://lkml.org/lkml/2007/1/19/136

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America