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Viewing continuously updated performance data

You can monitor cluster performance by viewing data that continuously updates with the latest status. You can view data for only one object and one instance at a time.

About this task

For more information about the statistics show-periodic command, see the man page.

Note: The statistics show-periodic command is deprecated, but you can still use it to view performance data.

You can also use the statistics show command with the -tab parameter to display continuously updated data.

Steps

  1. Switch to the advanced privilege level by using the set -privilege advanced command.
  2. Use the statistics show-periodic command to view continuously updated performance data.
    If you do not specify the -object parameter, the command returns summary data for the cluster.

Example: Monitoring volume performance

This example shows how you can monitor volume performance. For example, you might want to monitor volume performance if critical applications run on those volumes. Viewing the performance data can help you answer questions such as the following:

The following command shows performance data for a volume by specifying counters that show the number of operations per second and latency:

cluster1::*> statistics show-periodic -object volume -instance vol0  -counter write_ops|read_ops|total_ops|read_latency|write_latency|avg_latency
cluster1: volume.vol0: 1/7/2013 20:15:51
      avg     read             total    write    write
  latency  latency read_ops      ops  latency      ops
 -------- -------- -------- -------- -------- --------
    202us    218us        0       22    303us        7
     97us     43us       31       71    149us       34
     39us      0us        0        3      0us        0
    152us      0us        0       16    152us       16
    162us      0us        0      342    144us      289
    734us      0us        0       15      0us        0
     49us      0us        0        1      0us        0
cluster: volume.vol0: 1/7/2013 20:16:07
      avg     read             total    write    write
  latency  latency read_ops      ops  latency      ops
 -------- -------- -------- -------- -------- --------
Minimums:
     39us      0us        0        1      0us        0
Averages for 7 samples:
    205us     37us        4       67    106us       49
Maximums:
    734us    218us       31      342    303us      289