How can I determine the network latency of my multi-site cluster?

Environment

• Red Hat Enterprise Linux Server 5 (with the High Availability Add on)
• Red Hat Enterprise Linux Server 6 (with the High Availability Add on)
• Red Hat Enterprise Linux Server 7 (with the High Availability Add on)
• Red Hat Ceph Storage
• Red Hat Gluster Storage

Issue

• What is a good way to measure site to site network latency?

Resolution

The ping command is a good way to measure the latency. The following command is an example and should be run at each site while pinging another site:

  $ ping -c100 -q other.node.ip

If more detailed results are needed, some more complex tools should be used instead, like mtr. Refer to their man pages for details.

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