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410 Administering cluster functionality
Cluster initialization and configuration
Cluster initialization and configuration
Before any nodes can join a new cluster for the first time, you must supply
certain configuration information during cluster monitor setup. This
information is normally stored in some form of cluster monitor configuration
database. The precise content and format of this information depends on the
characteristics of the cluster monitor. The information required by VxVM is as
follows:
■ cluster ID
■ node IDs
■ network addresses of nodes
■ port addresses
When a node joins the cluster, this information is automatically loaded into
VxVM on that node at node startup time.
Note: To make effective use of the cluster functionality of VxVM requires that
you configure a cluster monitor (such as provided by HP Serviceguard, or by
GAB (Group Membership and Atomic Broadcast) in VCS). If HP Serviceguard is
used as the cluster monitor, no additional configuration of VxVM is required,
apart from the cluster configuration requirements of HP Serviceguard.
The cluster monitor startup procedure effects node initialization, and brings up
the various cluster components (such as VxVM with cluster support, the cluster
monitor, and a distributed lock manager) on the node. Once this is complete,
applications may be started. The cluster monitor startup procedure must be
invoked on each node to be joined to the cluster.
For VxVM in a cluster environment, initialization consists of loading the cluster
configuration information and joining the nodes in the cluster. The first node to
join becomes the master node, and later nodes (slaves) join to the master. If two
nodes join simultaneously, VxVM chooses the master. Once the join for a given
node is complete, that node has access to the shared disk groups and volumes.
Cluster reconfiguration
Cluster reconfiguration occurs if a node leaves or joins a cluster. Each node’s
cluster monitor continuously watches the other cluster nodes. When the
membership of the cluster changes, the cluster monitor informs VxVM for it to
take appropriate action.