710 IBM Tivoli Storage Manager in a Clustered Environment
16.7 Cluster administration facilities
Administration in a VERITAS cluster is generally carried out via the cluster
manager GUI interface. The cluster manager provides a graphical view of cluster
status for resources, service groups, heartbeat communication, etc.
Administration security: A VCS administrator can have one of five user
categories. These include
Cluster Administrator, Cluster Operator, Group
, Group Operator, and Cluster Guest. Functions within these
categories overlaps. The Cluster Administrator has full privileges and the
ClusterGuest has read only function. User categories are set implicitly for the
cluster by default, but can be also be set explicitly for individual service
Logging: VCS generates both error messages and log entries for activity in
the cluster from both the cluster engine and each of the agents. Log files
related to the cluster engine can be found in the /var/VRTSsvc/log directory,
and agent log files in the $VCS_HOME/log directory. Each VCS message has
a tag, which is used to indicate the type of the message. Tags are of the form
TAG_A-E, where TAG_A is an error message and TAG_D indicates that an
action has occurred in the VCS cluster. Log files are ASCII text and user
readable. However, the cluster management interface is typically used to
Monitoring and diagnostic tools: VCS can monitor both system events and
applications. Event triggers allow the system administrator to define actions to
be performed when a service group or resource hits a particular trigger.
Triggers can also be used to carry out an action before the service group
comes online or goes offline. The action is typically a script, which can be
edited by the user. The event triggers themselves are pre-defined. Some can
be enabled by administrators, where others are enabled by default. In
addition, VCS provides simple network management protocol (SNMP),
management interface base (MIB), and simple mail transfer protocol (SMTP)
notification. The severity level of a notification is configurable. Event
notification is implemented in VCS using
Emulation tools: There are no emulation tools in the current release of
VERITAS Cluster Server for AIX Version 2.0.
16.8 HACMP and VERITAS Cluster Server compared
The following section describes HACMP and highlights where terminology and
operation differ between HACMP and VERITAS Cluster Server (VCS). HACMP
and VCS have fairly comparable function, but differ in some areas. VCS has
support for cross-platform management, is integrated with other VERITAS
products, and uses a GUI interface as its primary management interface.
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