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From 4f6ebfc537b2d3671112a54873081685d47066db Mon Sep 17 00:00:00 2001
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From: David Vossel <dvossel@redhat.com>
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Date: Fri, 18 Jul 2014 12:31:55 -0400
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Subject: [PATCH] Low: LVM: Warn users about the danger of lvmetad
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---
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heartbeat/LVM | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/heartbeat/LVM b/heartbeat/LVM
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index 4378cd3..27cdfbd 100755
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--- a/heartbeat/LVM
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+++ b/heartbeat/LVM
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@@ -545,6 +545,25 @@ LVM_validate_all() {
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check_binary $AWK
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##
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+ # lvmetad is a daemon that caches lvm metadata to improve the
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+ # performance of LVM commands. This daemon should never be used when
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+ # volume groups exist that are being managed by the cluster. The lvmetad
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+ # daemon introduces a response lag, where certain LVM commands look like
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+ # they have completed (like vg activation) when in fact the command
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+ # is still in progress by the lvmetad. This can cause reliability issues
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+ # when managing volume groups in the cluster. For Example, if you have a
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+ # volume group that is a dependency for another application, it is possible
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+ # the cluster will think the volume group is activated and attempt to start
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+ # the application before volume group is really accesible... lvmetad is bad.
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+ ##
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+ lvm dumpconfig global/use_lvmetad | grep 'use_lvmetad.*=.*1' > /dev/null 2>&1
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+ if [ $? -eq 0 ]; then
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+ # for now warn users that lvmetad is enabled and that they should disable it. In the
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+ # future we may want to consider refusing to start, or killing the lvmetad daemon.
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+ ocf_log warn "Disable lvmetad in lvm.conf. lvmetad should never be enabled in a clustered environment. Set use_lvmetad=0 and kill the lvmetad process"
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+ fi
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+
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+ ##
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# Off-the-shelf tests...
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##
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VGOUT=`vgck ${VOLUME} 2>&1`
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--
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1.8.4.2
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