linux-kernel - Re: let md auto-detect 128+ raid members, fix potential race condition

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Message-ID: <20060802064742.GD28815@percy.comedia.it>
Date:	Wed, 2 Aug 2006 08:47:42 +0200
From:	Luca Berra <bluca@...edia.it>
To:	Alexandre Oliva <aoliva@...hat.com>
Cc:	Bill Davidsen <davidsen@....com>, Neil Brown <neilb@...e.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: let md auto-detect 128+ raid members, fix potential race condition

On Tue, Aug 01, 2006 at 06:32:33PM -0300, Alexandre Oliva wrote:
>Sure enough the LVM subsystem could make things better for one to not
>need all of the PVs in the root-containing VG in order to be able to
>mount root read-write, or at all, but if you think about it, if initrd
it shouldn't need all of the PVs you just need all the pv where the
rootfs is.

>is set up such that you only bring up the devices that hold the actual
>root device within the VG and then you change that, say by taking a
>snapshot of root, moving it around, growing it, etc, you'd be better
>off if you could still boot.  So you do want all of the VG members to
>be around, just in case.
in this case just regenerate the initramfs after modifying the vg that
contains root. I am fairly sure that kernel upgrades are far more
frequent than the addirion of PVs to the root VG.

>Yes, this is an argument against root on LVM, but there are arguments
>*for* root on LVM as well, and there's no reason to not support both
>behaviors equally well and let people figure out what works best for
>them.

No, this is just an argument against misusing root on lvm.

L.

-- 
Luca Berra -- bluca@...edia.it
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