Using Serviceguard Extension for RAC, 6th Edition, April 2008

truly cluster-aware, obtaining information about cluster membership from Serviceguard
directly.
Cluster information is provided via a special system multi-node package, which runs
on all nodes in the cluster. The cluster must be up and must be running this package
before you can configure VxVM disk groups for use with CVM. Disk groups must be
created from the CVM Master node. The Veritas CVM package for version 3.5 is named
VxVM-CVM-pkg; the package for CVM version 4.1 and later is named SG-CFS-pkg.
CVM allows you to activate storage on one node at a time, or you can perform write
activation on one node and read activation on another node at the same time (for
example, allowing backups). CVM provides full mirroring and dynamic multipathing
(DMP) for clusters. CVM supports concurrent storage read/write access between
multiple nodes by applications which can manage read/write access contention, such
as Oracle Real Application Cluster (RAC).
NOTE: CVM (and CFS - Cluster File System) are supported on some, but not all,
current releases of HP-UX. See the latest release notes for your version of Serviceguard
at http://www.docs.hp.com -> High Availability - > Serviceguard.
Veritas Storage Management Products
Veritas Volume Manager (VxVM) 3.5 is not supported on HP-UX 11i v3. If you are
running VxVM 3.5 as part of HP-UX (VxVM-Base), version 3.5 will be upgraded to
version 4.1 when you upgrade to HP-UX 11i v3.
About Multipathing
Multipathing is automatically configured in HP-UX 11i v3 (this is often called native
multipathing), or in some cases can be configured with third-party software such as
EMC Powerpath.
NOTE: 4.1 and later versions of Veritas Volume Manager (VxVM) and Dynamic
Multipathing (DMP) from Symantec are supported on HP-UX 11i v3, but do not provide
multipathing and load balancing; DMP acts as a pass-through driver, allowing
multipathing and load balancing to be controlled by the HP-UX I/O subsystem instead.
For more information about multipathing in HP-UX 11i v3, see the white paper HP-UX
11i v3 Native Multipathing for Mass Storage, and the Logical Volume Management volume
of the HP-UX System Administrator’s Guide in the HP-UX 11i v3 Operating Environments
collection at http://docs.hp.com. See also, About Device File Names (Device Special
Files)” on page 57.
About Device Special Files
HP-UX releases up to and including 11i v2 use a naming convention for device files
that encodes their hardware path. For example, a device file named
Veritas Storage Management Products 45