Veritas Storage Foundation 5.0.1 Cluster File System Administrator's Guide Extracts for the HP Serviceguard Storage Management Suite on HP-UX 11i v3

3 Cluster File System Administration
The following HP Serviceguard Storage Management Suite bundles include the Veritas Storage
Foundation™ 5.0.1 Cluster File System (CFS) and Cluster Volume Manager (CVM) by Symantec:
• Bundles T2775DB, T2777DB of the HP Serviceguard Storage Management Suite version
A.03.00 for HP-UX 11i v3
• High Availability Operating Environment (HAOE) bundles T8680DB, T8681DB, and T8682DB,
of the HP Serviceguard Storage Management Suite version A.03.00 for HP-UX 11i v3
• Data Center Operating Environment (DCOE) bundles T8684DB, T8685DB, and T8686DB of
the HP Serviceguard Storage Management Suite version A.03.00 for HP-UX 11i v3
CFS enables multiple hosts to mount and perform file operations concurrently on the same
storage device. To operate in a cluster configuration, CFS requires the integrated set of Veritas
™ products by Symantec that are included in the HP Serviceguard Storage Management Suite.
CFS includes Low Latency Transport (LLT) and Group Membership Atomic Broadcast (GAB)
packages. The LLT package provides node-to-node communications and monitors network
communications. The GAB package provides cluster state, configuration, and membership
services. It also monitors the heartbeat links between systems to ensure that they are active.
There are other packages provided by HP Serviceguard that provide application failover support
when you install CFS as part of a high availability solution.
CFS also requires the cluster volume manager (CVM) component of the Veritas™ Volume
Manager (VxVM) to create the shared volumes necessary for mounting cluster file systems.
NOTE: To install and administer CFS, you should have a working knowledge of cluster file
systems. To install and administer application failover functionality, you should have a working
knowledge of HP Serviceguard. For more information on these products, refer to the HP
Serviceguard documentation and the Veritas™ Volume Manager (VxVM) documentation available
in the /usr/share/doc/vxvmdirectory after you install CFS. You can also access this
documentation at: http://www.docs.hp.com
The HP Serviceguard Storage Management Suite Release Notes contain an extensive list of release
specific HP and Veritas ™ documentation with part numbers to facilitate search and location at:
http://www.docs.hp.com
Topics in this chapter include:
• “Cluster Messaging - GAB” (page 23)
• “Cluster Communication - LLT” (page 24)
• “Volume Manager Cluster Functionality Overview” (page 24)
• “Cluster File System Overview” (page 24)
• “Cluster File System Administration” (page 25)
• “Snapshots for Cluster File Systems” (page 27)
Cluster Messaging - GAB
GAB provides membership and messaging services for clusters and for groups of applications
running on a cluster. The GAB membership service provides orderly startup and shutdown of
clusters.
GAB is automatically configured initially when Serviceguard is installed, and GAB is also
automatically configured each time the CFS package is started.
For more information, see the gabconfig(1m) manual page.
Cluster Messaging - GAB 23