Bug 235092 - clvmd operations timeout under heavy load == bad for recovery scenarios
clvmd operations timeout under heavy load == bad for recovery scenarios
Status: CLOSED ERRATA
Product: Red Hat Cluster Suite
Classification: Red Hat
Component: lvm2-cluster (Show other bugs)
4
All Linux
medium Severity medium
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Assigned To: Milan Broz
Cluster QE
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Depends On:
Blocks:
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Reported: 2007-04-03 14:51 EDT by Jonathan Earl Brassow
Modified: 2013-02-28 23:05 EST (History)
7 users (show)

See Also:
Fixed In Version: RHBA-2007-0046
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2007-05-10 17:10:01 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Jonathan Earl Brassow 2007-04-03 14:51:02 EDT
When a mirror device fails under heavy load, it can take a very long time
(minutes) for each CLVM command to process.  This can lead to clvmd time-outs
being triggered and the mirror fault handling code to abort.

The root of the problem is the need for remote nodes to have to scan the devices
when doing activates/deactivates.  Those scans get queued up behind all the
other I/O that is happening and simply take a long time.

Either we need to find a completely different way to detect stalled machines, or
we need to raise the clvmd timeout (e.g. clvmd -t 100).  I'm advocating the
later for now and the former when we have more time to investigate.
Comment 1 Jonathan Earl Brassow 2007-04-03 14:52:12 EDT
To be clear about my request:

Let's increase the clvmd timeout.

Comment 2 Jonathan Earl Brassow 2007-04-16 16:49:05 EDT
Index: LVM2/scripts/clvmd_init_rhel4
===================================================================
--- LVM2.orig/scripts/clvmd_init_rhel4
+++ LVM2/scripts/clvmd_init_rhel4
@@ -15,7 +15,7 @@ VGCHANGE="/usr/sbin/vgchange"
 VGSCAN="/usr/sbin/vgscan"
 VGDISPLAY="/usr/sbin/vgdisplay"
 VGS="/usr/sbin/vgs"
-CLVMDOPTS="-T20"
+CLVMDOPTS="-T20 -t 90"

 [ -f /etc/sysconfig/cluster ] && . /etc/sysconfig/cluster

Comment 8 Red Hat Bugzilla 2007-05-10 17:10:01 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0046.html

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