Managing HP Serviceguard A.11.20.20 for Linux, May 2013

• Restart normal package monitoring by restarting the node (cmrunnode) or the cluster ().
• You can forcefully halt a detached node (cmhaltnode (1m)) with the -f option.
7.3.2 Rules and Restrictions
The following rules and restrictions apply.
• All the nodes in the cluster must be running Serviceguard A.11.20.10 or later.
• All the configured cluster nodes must be reachable by an available network.
• You must be the root user (superuser) to halt or start a node or cluster with Live Application
Detach, and to halt a detached package.
• Extended Distance Cluster (serviceguard-xdc) supports LAD for modular failover packages.
For more information, see “Creating a serviceguard-xdc Modular Package” in chapter 5 of
HP Serviceguard Extended Distance Cluster for Linux A.11.20.20 Deployment Guide at http://
www.hp.com/go/linux-serviceguard-docs.
• Live Application Detach is supported only with modular failover packages and modular
multi-node packages.
◦ You cannot use Live Application Detach if system multi-node packages are configured in
the cluster.
See Chapter 6 (page 169) for more information about package types.
• You cannot detach package that is in maintenance mode, and you cannot place a package
into maintenance mode if any of its dependent packages are detached. Also, you cannot put
a detached package in maintenance mode.
For more information about maintenance mode, see“Maintaining a Package: Maintenance
Mode” (page 220). For more information about dependencies, see “About Package
Dependencies” (page 112).
• You cannot make configuration changes to a package or a cluster in which any packages
are detached.
cmapplyconf (1m) will fail.
• You cannot halt detached packages while the cluster is down.
If you have halted a node and detached its packages, you can log in as superuser on any
other node still running in the cluster and halt any of the detached packages. But if you have
halted the cluster, you must restart it, re-attaching the packages, before you can halt any of
the packages.
• cmeval (1m) does not support Live Application Detach.
See “Previewing the Effect of Cluster Changes” (page 226) for more information about cmeval.
• In preview mode (-t) cmrunnode and cmruncl can provide only a partial assessment of
the effect of re-attaching packages.
The assessment may not accurately predict the placement of packages that depend on the
packages that will be re-attached. For more information about preview mode, see “Previewing
the Effect of Cluster Changes” (page 226).
• cmmodpkg -e -t is not supported for a detached package.
• You cannot run a package that has been detached.
This could come up if you detect that a package has failed while detached (and hence not
being monitored by Serviceguard). Before you could restart the package on another node,
214 Cluster and Package Maintenance