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HighAvailabilityManager is configurable via the following variables. Variable NameUsage| ha

global settingdescriptiondefault value

stop.retry.

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interval

The time in seconds between retries to stop or destroy a VM.

600
restart
stop
.retry.
wait
intervalThe time
to wait before retrying the stop
(in seconds) between retries to restart a VM.600

time.between.cleanup

Time
The time in seconds to wait before the cleanup thread runs for the
cleanup thread runs
different HA-Worker-Threads. The cleanup thread finds all the work items that were successful and is now ready to be purged from the the database (table: op_ha_work).86400
time.between.failuresTime in seconds before try to cleanup all the VMs which are registered for the HA event that were successful and are now ready to be purged.3600

max.retries

The number of times to

retry start

try a restart for the different Work-Types:

Migrating - VMs off of a host, Destroy - a VM,
Stop - a VM for storage pool migration purposes,
CheckStop - checks if a VM has been stopped, ForceStop - force a VM to stop even if the states don't allow it,
Destroy - a VM and HA - restart a VM.

5

time.to.sleep

Time in seconds to sleep if no work items are found.

60

ha.workers

The number of High-Availability worker threads

to spin

to spin off to do the processing.

5

Manual Intervention

As part of the CloudStack HA design, CloudStack HA must not restart a VM if it cannot be sure that it can be done safely.  In those cases, the VM stays in a transitional state.  In those cases, the system administrator can manually intervene by checking to make sure the VM or the host the VM is shutdown, and then calling CloudStack to stop the VM with forced stop flag set to true.  When called in this manner, CloudStack attempts to stop the VM but will continue to release resources even if any of the operations to the hypervisor host cannot be completed.  After doing this, CloudStack HA will stop any attempt to restart the VM and it can be restarted by the administrator. 

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