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42 lines
1.7 KiB
42 lines
1.7 KiB
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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