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Maintenance Commands | nhcmmd(1M)

- NAME
- SYNOPSIS
- DESCRIPTION
- OPTIONS
- EXIT STATUS
- FILES
- ATTRIBUTES
- SEE ALSO

## 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 TYPE | ATTRIBUTE VALUE
> --- | ---
> Architecture | Sparc
> Availability | SUNWnhcmb
> Interface Stability | Evolving

## SEE ALSO

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

Netra HAS FS 2.1 | Go To Top | Last Changed September 2004

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