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1. Leverage native HA capabilities for user VM HA for XS 6.2 and above. For sake of backward compatibility the existing option will also be available and a choice will be given to use any one. For older versions of XS (prior to 6.2) there is no change. HA for system VMs would still be based on application logic.
2. The hack for rebooting host (check xenheartbeat.sh script) in case of primary-storage(PS) failure will be removed as CS no longer needs to take any actions on user VMs as part of HA.

   1. Wiki Markup
      This will fix the problem described in \[2\].

Jira ticket: https://issues.apache.org/jira/browse/CLOUDSTACK-5203

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1. Wiki Markup

   SSVM/CPVM: These are monitored on a regular basis. If these are found to be stopped then the monitoring application restarts them, and if not found then recreated. In case the agent running on these VMs is not responding then only the agent state is updated to 'Disconnected' in the database but nothing else is done. Even in this case a new VM needs to be started. Created a bug for this \[23\].

2. VR: For virtual router HA, the recommended way is to use redundant VR (RVR) functionality.

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\[1\] [http://support.citrix.com/servlet/KbServlet/download/34969-102-704897/reference.pdf] (refer section 3.8)

\[2\] https://issues.apache.org/jira/browse/CLOUDSTACK-3367

\[3\] https://issues.apache.org/jira/browse/CLOUDSTACK-5247