shwstppr commented on a change in pull request #223:
URL:
https://github.com/apache/cloudstack-documentation/pull/223#discussion_r672205178
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File path: source/adminguide/reliability.rst
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@@ -126,6 +183,107 @@ that you want to dedicate to HA-enabled VMs.
a crash.
+HA-Enabled Hosts
+----------------
+
+The user can specify a host as HA-enabled, In the event of a host
+failure, attemps will be made to recover the failed host by first
+issuing some OOBM commands. If the host recovery fails the host will be
+fenced and placed into maintenance mode. To restore the host to normal
+operation, manual intervention would then be required.
+
+Out of band management is a requirement of HA-Enabled hosts and has to be
+confiured on all intended participating hosts.
+(see `“Out of band management” <hosts.html#out-of-band-management>`_).
+
+Host-HA has granular configuration on a host/cluster/zone level. In a large
+environment, some hosts from a cluster can be HA-enabled and some not,
+
+Host-HA uses a state machine design to manage the operations of recovering
+and fencing hosts. The current status of a host is reported when quering a
+specific host.
+
+Timely health investigations are done on HA-Enabled hosts to monitor for
+any failures. Specific thersholds can be set for failed investigations,
Review comment:
```suggestion
any failures. Specific thresholds can be set for failed investigations,
```
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