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400 Administering cluster functionality
Overview of cluster volume management
Figure 13-1 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 of VxVM requires that one node act as the
master node; 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
Node 0
(master)
Node 1
(slave)
Node 2
(slave)
Node 3
(slave)
Cluster-shareable
disks
Redundant private network
Cluster-shareable disk
groups