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

• A new command, cmdisklock, can be used to repair or replace a lock LUN; see
“Replacing a Lock LUN” in Chapter 8 of Managing Serviceguard for Linux, and the
cmdisklock manpage, for more information.
• Serviceguard for Linux version A.11.18 introduced initial support for two
application interfaces based on the Service Availability Forum Specification (SAF,
saforum.org). These are for use only by ISVs (Independent Software Vendors)
with special support contracts.
Ask your HP Service Representative to contact the Serviceguard for Linux
development team for more information on these interfaces.
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 “Documents for This Version ” (page 37).
About Cross-Subnet Configurations
As of Serviceguard A.11.18, Serviceguard allows you to configure multiple subnets,
joined by a router, both for the cluster heartbeat and for data, with some nodes using
one subnet and some another.
A cross-subnet configuration allows:
• Automatic package failover from a node on one subnet to a node on another
• A cluster heartbeat that spans subnets.
Features Introduced Before A.11.19 29