Managing HP Serviceguard for Linux, Tenth Edition, September 2012

that represent the high availability applications that they are associated with (for example,
lvoldatabase) will simplify cluster administration.
To further document your package-related volume groups, logical volumes, and file
systems on each node, you can add commented lines to the /etc/fstab file. The
following is an example for a database application:
# /dev/vg01/lvoldb1 /applic1 ext2 defaults 0 1 # These six entries are
# /dev/vg01/lvoldb2 /applic2 ext2 defaults 0 1 # for information purposes
# /dev/vg01/lvoldb3 raw_tables ignore ignore 0 0 # only. They record the
# /dev/vg01/lvoldb4 /general ext2 defaults 0 2 # logical volumes that
# /dev/vg01/lvoldb5 raw_free ignore ignore 0 0 # exist for Serviceguard's
# /dev/vg01/lvoldb6 raw_free ignore ignore 0 0 # HA package. Do not uncomment.
Create an entry for each logical volume, indicating its use for a file system or for a raw
device.
CAUTION: Do not use /etc/fstab to mount file systems that are used by Serviceguard
packages.
For information about creating, exporting, and importing volume groups, see “Creating
the Logical Volume Infrastructure ” (page 169).
Planning for NFS-mounted File Systems
As of Serviceguard A.11.20, you can use NFS-mounted (imported) file systems as shared
storage in packages.
The same package can mount more than one NFS-imported file system, and can use
both cluster-local shared storage and NFS imports.
The following rules and restrictions apply.
• NFS mounts are supported for modular, failover packages. It is now possible (as of
A.11.20 April 2011 patch release) to create a Multi-Node Package that uses an
NFS file share, and this is useful if you want to create a HP Integrity Virtual Machine
(HPVM) in a Serviceguard Package, where the virtual machine itself uses a remote
NFS share as backing store.
For details on how to configure NFS as a backing store for HPVM, see the HP
Integrity Virtual Machines 4.3: Installation, Configuration, and Administration guide
at http://www.hp.com/go/virtualization-manuals —> HP Integrity Virtual
Machines and Online VM Migration.
See Chapter 6 (page 199) for a discussion of types of packages.
• So that Serviceguard can ensure that all I/O from a node on which a package has
failed is flushed before the package restarts on an adoptive node, all the network
switches and routers between the NFS server and client must support a worst-case
timeout, after which packets and frames are dropped. This timeout is known as the
Maximum Bridge Transit Delay (MBTD).
122 Planning and Documenting an HA Cluster