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[HA Guide] Indicate cluster latency requirements

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Change-Id: Ie3455cf37a85fd5c60e9c8baab6284972a427a7f
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Andrew Beekhof 2016-09-19 15:13:28 +10:00 committed by Andrew Beekhof
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doc/ha-guide/source/environment-hardware.rst
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@ -28,6 +28,16 @@ with core services and several instances:
| compute node | 8+ | 12+ GB | 120+ GB | 2 |
+-------------------+------------------+----------+-----------+------+
We recommended that the maximum latency between any two controller
nodes is 2 milliseconds. Although the cluster software can be tuned to
operate at higher latencies, some vendors insist on this value before
agreeing to support the installation.
The `ping` command can be used to find the latency between two
servers.
Virtualized hardware
~~~~~~~~~~~~~~~~~~~~
For demonstrations and studying,
you can set up a test environment on virtual machines (VMs).