XenServer restarts unexpectedly

When configuring HA through the gui, the default timeout in case of a failure is 30 seconds. It's important to increase it to avoid unnecessary restarts:

1. Disable HA through the GUI.
2. Connect to the Pool Master and type the following:

xe pool-ha-enable heartbeat-sr-uuids=<NFS's SR Storage> ha-config:timeout=<TimeInSeconds>

Xen Server NFS timeout

To change the timeout of the NFS mounts:

vi /opt/xensource/sm/nfs.py xen

Change the mathematical expression from:

SOFTMOUNT_TIMEOUT  = int((40.0/3.0) * 10.0) # 1/10 s

To the desired timeout, change only the 10.0 value:

SOFTMOUNT_TIMEOUT  = int((40.0/3.0) * 40.0) # 1/10 s

Installing Xen Server updates

Upload the patch to the server:

xe patch-upload -s <hostname> -u root -pw <password>file-name=<path to xsupdate file>

Apply the patch to the master server:

xe -s <hostname> -u root -pw <password> patch-pool-apply uuid=<uuid from the step 1's output>

Verify that the servers were updated:

xe patch-list -s <hostname> -u root -pw <password> name-label=<Updates ID>

Verifying who the master is

Run the following command to find a server with the master role:

xe pool-list params=uuid,master

Copy the UUID of the server and paste it in the following template:

xe host-list uuid=<uuid from last step>