Continentalclusters Version A.08.00 Release Notes, September 2010 (T2346-90014)

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-> High Availability program tips and issues (Europe).
Fixes
The following defect is fixed in this version of Continentalcluster Version A.08.00:
• QXCR1001056270
The cmrecovercl command fails to import CVM disk groups.
The information provided here is subject to change without notice. For the most current
information contact your HP support representative.
Known Problems and Workarounds
This section describes the known problems with the Continentalclusters version A.08.00
and the workarounds. This information is subject to change without notice. For the
most current information contact your HP support representative.
More recent information on known problems and workarounds may be available on
the Hewlett Packard IT Resource Center:
http://itrc.hp.com (Americas and Asia Pacific)
http://europe.itrc.hp.com (Europe)
Applications hang when all PV links are down
• What is the problem?
When all PV links to a disk array used by a primary or recovery package are down,
the package applications accessing that array will hang indefinitely. The
applications will not detect an error and cannot be killed. Even running cmhaltpkg
will not stop the application.
• What is the workaround?
The default behavior of LVM is to retry access forever following a failure. There
are a number of ways to recover from this application hang problem:
— Reboot the node. The package will then move to another node in the cluster.
— Fix the problem so that one or more PV Links is restored. The application will
then continue normally.
— It is also possible to change the default LVM behavior so that it will not retry
forever. There is an lvchange option that will establish a timeout value which
will cause LVM to return an error to the application if the access to the array
has failed and the timeout period has expired. The command uses the following
format:
lvchange -t <seconds> /dev/<vgname>/<lvname>
14 Continentalclusters Version A.08.00 Release Notes