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

IMPORTANT: This represents a net addition to the time it takes for the cluster to
re-form. For example, if the cluster typically took 40 seconds to re-form before any
HPVM nodes were added, it will generally take about 80 seconds when one or more
VM nodes are members of the cluster, if all those nodes have the hpvminfo software.
If any HPVM node without that software is a member of the cluster, it will take about
110 seconds. This is true whenever HPVM nodes are cluster members, whether or not
the re-formation is caused by the failure of an HPVM node.
For More Information
For more information about HP Integrity Virtual Machines, see HP Integrity Virtual
Machines Installation, Configuration, and Administration at http://docs.hp.com ->
HP Virtual Server Environment (VSE) -> HP Integrity Virtual
Machines. For instructions for installing hpvminfo and related HP software on an
HPVM guest, see Installing a Guest Depot in chapter 4 of that document.
For important configuration information, see Using Serviceguard for Linux with VMware
Virtual Machines at http://docs.hp.com -> High Availability ->
Serviceguard for Linux -> White Papers.
Support for DM-MPIO
Serviceguard for Linux supports DeviceMapper multipath (DM-MPIO) for application
LUNs. It also supports DM-MPIO for the lock LUN, as follows:
• On Red Hat 5.1 and later with HPDMtools 3.0 and later
• On SLES10 SP2 and later with HPDMtools 4.0 and later
You can use the DM-MPIO delivered with one of the above the distributions, instead
of HPDMtools, if that is supported by the storage array.
IMPORTANT: If you use DM-MPIO for the lock LUN on one node in a cluster, it must
be used on all nodes. The device names should be in the form
/dev/mapper/mpath<x>p<y>.
<x> can be different on different nodes, but <y> must be the same; for example:
• On node1: /dev/mapper/mpath0p1
• On node2: /dev/mapper/mpath1p1
For the latest information on supported configurations, see the Serviceguard for Linux
Certification Matrix at the address given under “What Documents are Available for This
Version ” (page 30).
28 Serviceguard for Linux Version A.11.19 Release Notes