Novell SUSE LINUX ENTERPRISE SERVER 10 SP2 HEARTBEAT Manual page 106

crm_uuid (8)
crm_uuid — get a node's UUID
Synopsis
Description
UUIDs are used to identify cluster nodes to ensure that they can always be uniquely
identified. The crm_uuid command displays and modifies the UUID of the node on
which it is run.
When Heartbeat is first started on a node, it creates a UUID (in binary form) in /var/
lib/heartbeat/hb_uuid. This file can be read and written by means of
crm_uuid.
NOTE
There are very rare circumstances when crm_uuid should be used to modify
the UUID file. The most common is when it is necessary to set a node's UUID
to a known value when creating a new cluster.
Options
--write, -w
Write a UUID value to the /var/lib/heartbeat/hb_uuid file.
WARNING
Use the -w option with care, because it creates a new UUID value for the
node on which it is run. Various scripts across the cluster might still use
the old value, causing the cluster to fail because the node is no longer as-
98 Heartbeat
crm_uuid [-w|-r]