IBM Tivoli Storage Manager in a Clustered Environment

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

Administrator

, 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

groups.

򐂰 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

view logs.

򐂰 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

triggers.

򐂰 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.