HP Serviceguard for Linux Version A.11.19 Release Notes, April 2009

can take up to one second, during which time the old cluster manager will shut down
and the new cluster manager will start.
CAUTION: From the time when the old cluster manager is shut down until the new
cluster manager forms its first cluster, a node failure will cause the entire cluster to fail.
HP strongly recommends that you use no Serviceguard commands other than
cmviewcl (1m) until the new cluster manager successfully completes its first cluster
re-formation. In the case of a rolling upgrade, this happens when the cmrunnode for
the last node executes; otherwise (if you have brought down the cluster in order to do
the upgrade) it happens during the initial cmruncl. See “How To Tell when the Cluster
Re-formation Is Complete” for more information.
For an upgrade to Serviceguard A.11.19, this recommendation is additional to the
“Limitations ” below, and supersedes any “Limitation” that is more lenient.
There may be further caveats that apply to specific upgrade paths; before you proceed,
make sure you read the “Announcements” (page 9) and “Compatibility Information
and Installation Requirements” (page 32).
How To Tell when the Cluster Re-formation Is Complete
You can tell when the cluster has re-formed under the new cluster manager by
monitoring syslog on any node. syslog will record that Serviceguard has started
and finished upgrading the node to the new cluster manager (Cluster Membership
Protocol version 2), and then, once all nodes have been upgraded, you will see
a message indicating that the new cluster has formed. Watch for three messages similar
to the following (for clarity, intervening messages have been replaced with ellipses
[...]):
Nov 14 13:52:46 bbq1 cmcld[20319]: Starting to upgrade this node to Cluster Membership Protocol
version 2
[....]
Nov 14 13:52:46 bbq1 cmcld[20319]: Finished upgrading this node to Cluster Membership Protocol version
2
[....]
Nov 14 13:52:47 bbq1 cmcld[20319]: Membership: membership at 3 is FORMED (coordinator 1) includes:
1 3 2 4 excludes
When you see the Membership: message, and specifically the capitalized word FORMED
in this message, the transition to the new cluster manager is complete and you can use
all the Serviceguard commands.
Limitations
The following limitations apply to rolling upgrades:
• During rolling upgrade, you should issue Serviceguard commands (other than
cmrunnode and cmhaltnode) only on a node containing the latest revision of
Compatibility Information and Installation Requirements 51