Managing Serviceguard Eighteenth Edition, September 2010

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 (page 448), this happens when the
cmrunnode for the last node executes; in a Non-Rolling Upgrade (page 449), 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 of Rolling Upgrades (page 451) and
Limitations of Non-Rolling Upgrades (page 459), 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”, “Compatibility”, and “Installing
Serviceguard” sections of the latest version of the HP Serviceguard Version A.11.19 Release
Notes at www.hp.com/go/hpux-serviceguard-docs .
If you are using a Quorum Server, make sure you also read the latest version of the HP
Serviceguard Quorum Server A.04.00 Release Notes before you proceed. These are also
posted on posted at www.hp.com/go/hpux-serviceguard-docs, under HP
Serviceguard Quorum Server Software.
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.
Types of Upgrade
Rolling Upgrade
In a rolling upgrade, you upgrade the HP-UX operating system (if necessary) and the
Serviceguard software one node at a time without bringing down your cluster. A rolling
448 Software Upgrades