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Obtaining cluster performance statistics

The vxstat utility returns statistics for specified objects. In a cluster environment, vxstat gathers statistics from all of the nodes in the cluster. The statistics give the total usage, by all nodes, for the requested objects. If a local object is specified, its local usage is returned.

You can optionally specify a subset of nodes using the following form of the command:

# vxstat -g diskgroup -n node[,node...]

where node is an integer. If a comma-separated list of nodes is supplied, the vxstat utility displays the sum of the statistics for the nodes in the list.

For example, to obtain statistics for node 2, volume vol1,use the following command:

# vxstat -g group1 -n 2 vol1

This command produces output similar to the following:

OPERATIONS BLOCKS AVG TIME(ms)

TYP NAME READ WRITE READ WRITE READ WRITE

vol vol1 2421 0 600000 0 99.0 0.0

To obtain and display statistics for the entire cluster, use the following command:

# vxstat -b

The statistics for all nodes are summed. For example, if node 1 performed 100 I/O operations and node 2 performed 200 I/O operations, vxstat -b displays a total of 300 I/O operations.