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Maintenance Commandsnhcmmd(1M)


NAME

 nhcmmd - manage cluster membership

SYNOPSIS

 /opt/SUNWcgha/sbin/nhcmmd [-h] [-u URL]

DESCRIPTION

The Cluster Membership Manager is implemented by the nhcmmd daemon. There is a nhcmmd daemon on each peer node.

The nhcmmd daemon on the master node has the current view of the cluster configuration and communicates its view to the nhcmmd daemons on the other peer nodes. The nhcmmd daemon on the master node determines which nodes are members of the cluster, assigns the roles and attributes to the nodes, detects the failure of nodes and configures routes for reliable transport.

The nhcmmd daemon on the vice-master node monitors the health of the master node. If the master node fails, the vice-master node is able to take over as the master node.

The nhcmmd daemon on each of the peer nodes do not communicate with each other. Each nhcmmd daemon exports an API to the notify clients of changes to the cluster, and to notify services and applications when the cluster membership or master changes. Notification messages describe the membership change and the nodeid of the affected node, making it possible for clients to maintain an accurate view of the peer nodes of the cluster.

For information about the CMM API, see the Intro(3CMM) man page.

OPTIONS

-h

Displays help information.

-u URL

You must specify the URL of the nhfs.conf file.

EXIT STATUS

The following exit values are returned:

0

Successful completion.

255

An error occurred.

FILES

cluster_nodes_table

The file that lists the configured nodes of the cluster and describes the nodes' attributes.

nhfs.conf

The file that contains configuration and addressing information for the different Foundation Services.

target.conf

The file that contains the domainid, attributes, and election roles for each node in the cluster

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
ArchitectureSparc
AvailabilitySUNWnhcmb
Interface StabilityEvolving

SEE ALSO

Intro(3CMM), cluster_nodes_table(4), nhfs.conf(4), and target.conf(4).


Netra HAS FS 2.1Go To TopLast Changed September 2004