VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 10, Administering Cluster Functionality

Overview of Cluster Volume Management

247

Example of a 4-Node Cluster

To the cluster monitor, all nodes are the same. VxVM objects conﬁgured within shared

disk groups can potentially be accessed by all nodes that join the cluster. However, the

cluster functionality ofVxVM requiresthat one nodeact as the masternode; all other nodes

in the cluster are slave nodes. Any node is capable of being the master node, and it is

responsible for coordinating certain VxVM activities.

Note You must run commands that conﬁgure or reconﬁgure VxVM objects on the master

node. Tasks that must be initiated from the master node include setting up shared

disk groups, creating and reconﬁguring volumes, and performing snapshot

operations.

VxVM determines that the ﬁrst node to join a cluster performs the function of master

node. If the master node leaves a cluster, one of the slave nodes is chosen to be the new

master. In “Example of a 4-Node Cluster,” node 0 is the master node and nodes 1, 2 and 3

are slave nodes.

Redundant

SCSI or Fibre

Channel

Connectivity

Cluster-Shareable

Disks

Redundant Private Network

Node 0

(master)

Node 1

(slave)

Node 2

(slave)

Node 3

(slave)

Cluster-Shareable

Disk Groups