Encrypted Volume and File System v2.2 Administrator Guide (777846-001, April 2014)

D Using EVFS with HP Serviceguard
This chapter describes how to use EVFS with the HP Serviceguard product.
This chapter addresses the following topics:
• “EVFS and HP Serviceguard overview” (page 168)
• “Configuration overview” (page 169)
• “Step 1: Installing EVFS” (page 169)
• “Step 2: Creating the HP Serviceguard storage infrastructure” (page 169)
• “Step 3 (EVS only): Configuring EVS on the configuration node” (page 171)
• “Step 3 (EFS only): Configuring EFS on the configuration node” (page 172)
• “Step 4 (EVS only): Configuring EVS Volumes on the adoptive nodes” (page 173)
• “Step 4 (EFS only): Configuring EFS volumes on the adoptive nodes” (page 175)
• “Step 5: Configuring HP Serviceguard using modular packages” (page 176)
• “Step 6: Configuring HP Serviceguard using legacy packages” (page 180)
EVFS and HP Serviceguard overview
A Serviceguard cluster is a networked group of HP 9000 or Integrity servers (host systems known
as nodes) with redundant hardware and software so that a single point of failure does not
significantly disrupt service. Application packages (individual HP-UX processes) can be grouped
together in failover packages. A failover package runs on a single node at a time. The node on
which the package initially runs is the primary node. If a single service, node, network or other
resource fails, Serviceguard can automatically transfer, or fail over, control of the package to
another node within the cluster, referred to as the adoptive node.
Serviceguard supports special storage infrastructures for clusters, including cluster aware LVM and
VxVM volume groups. A cluster aware LVM volume group can be activated by nodes in exclusive
mode only. A cluster aware volume group is typically configured on a disk that is physically
connected to multiple nodes. This enables the volume group to be physically accessible from multiple
nodes but activated for exclusive write access by only one node at a time. When used with failover
packages, the volume group is activated for exclusive write access on the node on which the
package is running.
Serviceguard A.11.18 and later has a simpler package configuration method which allows smaller
modules to be built into packages. This eliminates the use of a separate package control script
and needing to manually distribute it. These packages are referred to as modular packages.
Packages produced by older versions of Serviceguard (versions A.11.16 or A.11.17) are referred
to as legacy packages.
You can use EVFS volumes with Serviceguard failover packages as follows:
• Serviceguard failover package services or applications can use EVFS volumes or file systems
mounted on EVFS volumes. You can modify a Serviceguard package control script (for a
legacy package), or a Serviceguard package configuration file (for a modular package) to
enable EVFS volumes and mount file systems on EVFS volumes when a package starts.
• A cluster lock disk can co-exist on an LVM or VxVM volume group with volumes used by EVFS.
Requirements
To use EVFS with Serviceguard, the system must meet the following conditions:
• HP Serviceguard version A.11.16, A.11.17, A.11.18 or A.11.19 is installed.
• The EVFS volumes used by the package must be built on cluster aware LVM volume groups
or VxVM disk groups.
168 Using EVFS with HP Serviceguard