HP Serviceguard Version A.11.20 Release Notes, April 2011

• Does not support asymmetric network configurations (in which a given subnet is configured
only on a subset of nodes).
• When cmdeploycl (1m) is used on a cluster where SGeRAC is installed, cmdeploycl
(1m) provides a warning if the cluster being deployed does not meet SGeRAC specific
requirements.
For more information and instructions, see “Using Easy Deployment” in chapter 5 of Managing
Serviceguard.
Halting a Node or the Cluster while Keeping Packages Running (Live Application Detach)
There may be circumstances in which you want to do maintenance that involves halting a node,
or the entire cluster, without halting or failing over the affected packages. Such maintenance might
consist of anything short of rebooting the node or nodes, but a likely case is networking changes
that will disrupt the heartbeat.
New command options in Serviceguard A.11.20 (collectively known as Live Application Detach
(LAD)) allow you to do this kind of maintenance while keeping the packages running. The packages
are no longer monitored by Serviceguard, but the applications continue to run. Packages in this
state are called detached packages.
IMPORTANT:
• This capability applies only to modular failover packages and modular multi-node packages.
For more information, see “Halting a Node or the Cluster while Keeping Packages Running”
in chapter 7 of Managing Serviceguard..
• When upgrading to future releases, you will be able to use LAD in conjunction with rolling
upgrade, but you cannot use it when upgrading to A.11.20, because the capability is not
available until all the nodes are running A.11.20.
When you have done the necessary maintenance, you can restart the node or cluster, and normal
monitoring will resume on the packages.
What You Can Do
You can do the following.
• Halt a node (cmhaltnode (1m) with the -d option) without causing its running packages
to halt or fail over.
Until you restart the node (cmrunnode (1m)) these packages are detached — not being
monitored by Serviceguard.
• Halt the cluster (cmhaltcl (1m) with the -d option) without causing its running packages
to halt.
Until you restart the cluster (cmruncl (1m)) these packages are detached — not being
monitored by Serviceguard.
• Halt a detached package, including instances of detached multi-node packages.
• Restart normal package monitoring by restarting the node (cmrunnode) or the cluster
(cmruncl).
For more information, including important rules and restrictions, see “Halting a Node or the Cluster
while Keeping Packages Running” in chapter 7 of Managing Serviceguard.
Cluster-wide Device Special Files (cDSFs)
Under agile addressing on HP-UX 11i v3, each device has a unique identifier as seen from a given
host; this identifier is reflected in the name of the Device Special File (DSF). See “About Device
Special Files (DSFs)” (page 32) for more information.
18 Serviceguard Version A.11.20 Release Notes