sureshanaparti commented on a change in pull request #223:
URL:
https://github.com/apache/cloudstack-documentation/pull/223#discussion_r660378898
##########
File path: source/adminguide/reliability.rst
##########
@@ -126,6 +187,150 @@ 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,
+only when it’s exceeded, will the host transition to a different state.
+
+Host-HA uses both health checks and activity checks to make decisions on
+recovering and fencing actions. Once determined that the host is in faulty
+state (health checks failed) it runs activity checks to figure out if there is
+any disk activity on the VMs running on the specific host.
+
+HA Resource Management Service
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Review comment:
resource management service is part of Host HA, I think, no need of a
separate section for this.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: dev-unsubscr...@cloudstack.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
