Managing HP Serviceguard A.11.20.10 for Linux, December 2012

• 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.11.20.10 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 163) 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 212). For more information about dependencies, see “About Package
Dependencies” (page 107).
• 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 217) 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 217).
• 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,
you would need to run cmhaltpkg (1m) to halt the package on the node where it is
detached.
• You cannot halt a package that is in a transitory state such as STARTING or HALTING.
For more information about package states, see “Package Status and State” (page 194).
• A package that is in a DETACHED or MAINTENANCE state cannot be moved to a
halt_aborted state or vice versa.
For more information, see “Handling Failures During Package Halt” (page 210).
206 Cluster and Package Maintenance