Creating snapshot causes processes hang?
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Date: Tue, 01 Nov 2005 16:02:55 -0600
From: Kelly Sauke <[email protected]>
Subject: Re: [linux-lvm] Creating snapshot causes processes hang?
To: LVM general discussion and development <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1http://www.redhat.com/archives/linux-lvm/2005-July/msg00117.html
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."
In particular:
have any of the 18 patches shown at
ftp://sources.redhat.com/pub/dm/patches/2.6-unstable/2.6.12-
rc2/2.6.12-rc2-udm1/
gotten into 2.6.13 or 2.6.14, or into kernels blessed by Fedora? (eg, FC4-1526, maybe)
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?
..jim