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

From: Luca Berra
Date: Wed Aug 02 2006 - 02:45:30 EST

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

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


Luca Berra -- bluca@xxxxxxxxxx
Communication Media & Services S.r.l.
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