HP Serviceguard for Linux Version A.11.19 Release Notes, October 2009

For more information, see “About Package Dependencies” in Chapter 4 of the latest
version of Managing Serviceguard for Linux, and in particular the subsection “Extended
Dependencies”. See also the white paper Serviceguard’s Package Dependency Feature,
which you can find at docs.hp.com under High Availability —>
Serviceguard.
About Package Weights
Package weights and node capacities allow you to restrict the number of packages that
can run concurrently on a given node, or, alternatively, to limit the total package
“weight” (in terms of resource consumption) that a node can bear.
For example, suppose you have a two-node cluster consisting of a large system and a
smaller system. You want all your packages to be able to run on the large system at
the same time, but, if the large node fails, you want only the critical packages to run
on the smaller system. Package weights allow you to configure Serviceguard to enforce
this behavior.
For more information, see “About Package Weights” in Chapter 4 of the latest version
of Managing Serviceguard for Linux, and the white paper Using Serviceguard’s Node
Capacity and Package Weight Feature, which you can find on docs.hp.com under High
Availability —> Serviceguard —> White Papers.
About the IP Monitor
In addition to monitoring network interfaces at the link level, Serviceguard A.11.19
can also monitor the IP level, checking Layer 3 health and connectivity for both IPv4
and IPv6 subnets. This is done by the IP Monitor, which is configurable: you can enable
IP monitoring for any subnet configured into the cluster, but you do not have to monitor
any. You can configure IP monitoring for a subnet, or turn off monitoring, while the
cluster is running.
For more information, see the section “Monitoring LAN Interfaces and Detecting Failure:
IP Level ” in Chapter 3 of Managing Serviceguard for Linux.
New Online Cluster Configuration Capabilities
Serviceguard A.11.19 introduces new online cluster-management capabilities. The new
capabilities include:
• Changing the Quorum Server configuration
• Changing the lock LUN configuration
• Changing an interface from IPv4 to IPv6, or vice versa
For a summary of what can be changed online, with instructions and caveats, see the
section “Reconfiguring a Cluster” in Chapter 7 of the latest version of Managing
Serviceguard for Linux.
What’s in this Release 21