[linux-lvm] Creating snapshot causes processes hang?
James G. Sack (jim)
jsack at tandbergdatacorp.com
Tue Nov 1 23:20:21 UTC 2005
> Date: Tue, 01 Nov 2005 16:02:55 -0600
> From: Kelly Sauke <ksauke at fastenal.com>
> Subject: Re: [linux-lvm] Creating snapshot causes processes hang?
> To: LVM general discussion and development <linux-lvm at redhat.com>
> Message-ID: <4367E60F.8020004 at fastenal.com>
> Content-Type: text/plain; charset=ISO-8859-1
AHA! -- could this be a confirmation of what I have seen where lvremove
triggers the kcopyd BUG and consequent system deadlock?
(ref: my recent posting -- https://www.redhat.com/archives/linux-
lvm/2005-November/msg00002.html, where I report breakage upon lvremove
when there are 2 snapshots and i/o is occurring)
If so, do I also understand correctly that using unreleased patches and
some manual dmsetup commands might constitute a workaround?
I don't mind living with manual workarounds until snapshots is fixed,
but it would be wonderful to see an explicit recipe [for dummies, please
<grin>] for following the suggestions in the AGK july posting referenced
by ksauke, above), namely:
"Further patches are needed, but those two plus correct dmsetup use
should avoid machine lockups."
have any of the 18 patches shown at
gotten into 2.6.13 or 2.6.14, or into kernels blessed by Fedora? (eg,
And, could someone give me an example of "correct dmsetup" use? I
presume it involves suspend and resume -- but what else?
.. and in my case, what if there is an existing snapshot when I need to
create/remove a second one?
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