VERITAS Storage Foundation 4.1 Cluster File System HP Serviceguard Storage Management Suite Extracts, December 2005

Chapter 6, SFCFS Architecture

About CVM

Example of a Four-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 of VxVM requires one node to act as the master node; all other nodes

in the cluster are slave nodes. Any node is capable of being the master node, which 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 and creating and reconfiguring volumes.

VxVM designates the first node to join a cluster the master node. If the master node leaves

the cluster, one of the slave nodes is chosen to be the new master. In the preceding

example, node 0 is the master node and nodes 1, 2 and 3 are slave nodes.

Redundant

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