HP Serviceguard A.11.20.00 for Linux Release Notes, August 2012

NFS-mounted File Systems
As of Serviceguard A.11.20.00, NFS-mounted (imported) file systems are supported as shared
storage in packages. The same package can mount more than one NFS-imported file system, and
can use both cluster-local shared storage and NFS imports.
For more information, see “Planning for NFS-mounted File Systems” in Chapter 4 of Managing HP
Serviceguard A.11.20.00 for Linux manual.
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.11.20.00 (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.
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 HP Serviceguard A.11.20.00 for Linux manual.
Support for Virtualization with ESX as Hypervisor and Guests as Serviceguard Nodes
HP Serviceguard for Linux is certified for deployment on Linux Virtual machines created on VMware
ESX server. On Serviceguard for Linux clusters, virtualization is supported for various configurations
using physical machine and VMware virtual machines running on ESX server, so as to provide
high availability for applications.
NOTE: Serviceguard is certified on VMware ESX guests, not on ESX hosts, and provides high
availability for applications, not for the virtual machines themselves.
For more information, see the white paper Using Serviceguard for Linux with VMware Virtual
Machines, Managing HP Serviceguard A.11.20.00 for Linux manual at http://www.hp.com/go/
linux-serviceguard-docs, and HP Serviceguard for Linux Certification Matrix at www.hp.com/info/
sglx.
Improved Performance while Starting and Halting a Non-detached Multi-node Package
The commands cmrunpkg (1m) and cmhaltpkg (1m) have been modified so that you will
now see a performance improvement while starting or halting a non-detached multi-node package.
When cmrunpkg (1m) is run on a non-detached multi-node package, the package is started
simultaneously on all the nodes or the list of the nodes specified, thus reducing the down time in
starting the packages. Similarly, when cmhaltpkg (1m) is run on a non-detached multi-node
package, the package is halted simultaneously on all the nodes or the list of the nodes specified,
thus reducing the down time in halting the packages.
This performance improvement is directly dependent on the number of nodes on which the package
needs to be started or halted; the performance benefit increases as the number of nodes increases.
cmrunpkg (1m) and cmhaltpkg (1m) defaults to this behavior.
Deprecated or Obsolete Features
The following features are deprecated or obsolete in this version.
cmviewconf is obsolete as of Serviceguard A.11.20.00. Use cmviewcl (1m) to obtain
information about the cluster.
The Cluster Object Manager (COM) is obsolete as of Serviceguard A.11.20.00.
New and Changed Features in This Release 7