This topic tells you how to cleanly shut down all the nodes of a cluster for storage, moving, or long periods of planned inactivity. This shutdown procedure halts the database and writes the NVRAM (non-volatile RAM) contents to a mirrored partition for redundant storage, to ensure database safety and consistency.
When a single node is powered down for more than ten minutes, the cluster begins reprotecting that node's data until fault-tolerance is restored.
To shut down a node or cluster, issue the following command:
To halt a cluster of node immediately, without a clean shutdown, refer to The CLX Command-Line Administration Tool and the clx nanny commands, or simply press the power button on the nodes.
The node_id defaults to the node to which your session is connected. To shut down an entire cluster, issue the following command:
Applies to CLX4010 ONLY
After you start this process, remove power from the system before starting up again. The NVRAM is no longer battery-backed and batteries are not re-enabled until the units are powered up again.
Very few such units exist in production. If you purchased a system from Clustrix in 2009 or later, you do not have any such units.
Log in as root and issue the following command:
The NVRAM is now powered down and the battery backup unit is reset so that, when you reboot, the batteries are re-enabled. Your cluster is now ready for shipment or storage.
To ensure that a cluster will not form until all the nodes are restarted and ready (avoiding partial groups):
Where <n> is the expected number of nodes in the cluster. If <n> is not provided, the expected number of nodes in the cluster will be the current quorum.
This statement causes '5' to be written to /etc/clustrix/expected_nodes on every machine in the cluster during the shutdown sequence.