Enabling and Disabling High Availability for Nodes

Usually, you decide whether to enable High Availability (HA) support for a node when you install Parallels Cloud Storage on it.

To enable HA on a prepared node, do the following:

1. Execute the shaman join command. For example, to join the cluster pcs1 , execute:

   # shaman -c pcs1 join

   Note: Stop all service Containers (e.g., 1 and 50) before executing this command. Start them again after the command has been executed.

2. Configure and start the required services:

   # chkconfig snmpd on

   # service snmpd start

   # chkconfig shamand on

   # service shamand start

   # chkconfig pdrsd on

   # service pdrsd start

   Note: If you use snmpd for other purposes and it is already running, skip the two corresponding commands above.

To disable HA on a node, do the following:

1. Configure and stop the services which are no longer required:

   # chkconfig shamand off

   # service shamand stop

   # chkconfig pdrsd off

   # service pdrsd stop

2. Execute the shaman leave command. For example, to leave the cluster pcs1 , execute:

   # shaman -c pcs1 leave

After enabling or disabling HA support for a node, you can check the results of your actions with the shaman stat command.