HP Serviceguard A.11.20.20 for Linux Release Notes, May 2013

3.3 About the new features
This section explains the major new capabilities introduced in the A.11.20.20 release. For more
information about using these capabilities, see Managing HP Serviceguard A.11.20.20 for Linux
at http://www.hp.com/go/linux-serviceguard-docs.
3.3.1 Support for persistent reservation with Device Mapper multipath
Serviceguard for Linux packages use persistent reservations (PR) to control access to LUNs. Persistent
reservations, defined by the SCSI Primary Commands version 3 (SPC-3) standard, provide a means
to register I/O initiators and specify who can access LUN devices (anyone, all registrants, only
one registrant) and how (read-only, write-only).
Now, PR supports Device Mapper (DM) multipath in the modular package.
For more information about PR, see Managing HP Serviceguard A.11.20.20 for Linux manual.
3.3.2 Support for Red Hat Enterprise Linux Kernel-based Virtual Machine guests as cluster nodes
HP Serviceguard for Linux is certified for deployment on Red Hat Kernel-based Virtual Machine
(KVM) guests built on KVM hypervisor. You can also configure Serviceguard clusters consisting of
physical and virtual machines running certified Linux distributions.
Restrictions
The following restrictions apply when using KVM guests as cluster nodes:
• The iSCSI is the only supported storage mechanism for shared storage in a KVM environment.
FibreChannel storage is not supported.
• Lock LUN is not supported on iSCSI storage device. Hence, Quorum server is the only supported
quorum mechanism that can be used for arbitration.
• Live migration of KVM guests is not supported when the KVM guests are configured as
Serviceguard cluster nodes.
• Serviceguard does not support KVM guests running on Red Hat Enterprise Virtualization
Hypervisor (RHEV) as cluster nodes.
For more information about using Serviceguard with Red Hat Kernel-based Virtual Machines, see
Managing HP Serviceguard A.11.20.20 for Linux manual.
For more information about how to integrate KVM guests as Serviceguard cluster nodes, see the
Using HP Serviceguard for Linux with Red Hat KVM Guests white paper at http://www.hp.com/
go/linux-serviceguard-docs.
3.3.3 Support for cluster verification
Serviceguard provides tools that allow you to verify the cluster configuration and the state of its
components. Starting Serviceguard A.11.20.20, the cmcheckconf command can be used at
any time with –v or –v 2 options to verify the state of the cluster and package components that
are already applied. For more information, see Managing HP Serviceguard A.11.20.20 for Linux
and the cmcheckconf (1m) manpage.
3.3.4 Support for iSCSI storage device
Starting Serviceguard A.11.20.20, iSCSI storage device accessible via Linux distributed iSCSI
software initiator is supported as shared storage for application data in a Serviceguard for Linux
cluster. For more information about iSCSI storage device, see Managing HP Serviceguard
A.11.20.20 for Linux manual.
NOTE: An iSCSI storage device does not support configuring a lock LUN.
3 What is new in this release 7