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Maintenance Commandsnhprobed(1M)


NAME

 nhprobed - test accessibility of physical interfaces

SYNOPSIS

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

DESCRIPTION

Each peer node runs a daemon, nhprobed, that periodically sends a heartbeat in the form of an IP packet. The nhprobed daemon sends the heartbeats by multicast.

Heartbeats are sent through each of the two physical interfaces of each peer node. When a heartbeat is detected through a physical interface, it indicates that the node is reachable and that the physical interface is alive. If a heartbeat is not detected for a period of time exceeding the detection delay, the node or one of its physical interfaces is considered to have failed. If both of the node's physical interfaces fail, the node itself is considered to have failed. Heartbeats are broadcast at the rate of 3 per 900 milliseconds, and at least one heartbeat must be detected each 900 milliseconds.

On the master-eligible nodes, the nhprobed daemon receives a list of nodes from the nhcmmd daemon. The nhprobed daemon monitors the heartbeats of the nodes on the list. On the master node, the list contains all of the master-ineligible nodes and the vice-master node. On the vice-master node, the list contains the master node only.

On the master-eligible nodes, the nhprobed daemon notifies the nhcmmd daemon when, for any node on its list, any of the following events occur:

  • One link becomes available, indicating that the node is accessible through the link.

  • One link becomes unavailable, indicating that the node is not accessible through the link.

  • The node becomes available, indicating that the first link to the node becomes available.

  • The node becomes unavailable, indicating that the last available link to the node becomes unavailable.

EXTENDED DESCRIPTION

The nhprobed daemon uses a kernel module, hbmod, and a kernel driver, hbdrv. The kernel module and kernel driver manage the send and receive mechanisms of the nhprobed daemon. Because the kernel module and kernel driver operate in the kernel space, the nhprobed daemon is more robust against system overload.

Note – The probe heartbeat of the Foundation Services 2.1 is incompatible with that of the Foundation Services 2.1 6/03. All nodes in a cluster must have the same probe installation. For information about how to install the packages for the nhprobed daemon, the kernel module and kernel driver, see the Netra High Availability Suite Foundation Services 2.1 6/03 Custom Installation Guide.

The nhcmmd daemon and nhprobed daemon communicate through an Internet socket, AF_INET, in connection oriented mode. The socket port number can be configured in the /etc/services file, using the service name cmm_cgtp_probe.

OPTIONS

The nhprobed daemon takes the following options:

-h

Displays help information.

-u URL

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

For more information, see the nhfs.conf(4) man page.

EXIT STATUS

The following exit values are returned:

0

Successful completion.

1

An error occurred.

FILES

URL

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

The URL for this file could for example be file:///etc/opt/SUNWcgha/nhfs.conf

ATTRIBUTES

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

ATTRIBUTE TYPEATTRIBUTE VALUE
ArchitectureSPARC
AvailabilitySUNWnhcmb, SUNWnhhb
Interface StabilityEvolving
MT-LevelMT-Safe
Cancel-SafetyDeferred-Cancel-Safe Asynchronous-Cancel-Unsafe

SEE ALSO

Intro(3CMM), nhcmmd(1M), and nhfs.conf(4)


Netra HAS FS 2.1Go To TopLast Changed September 2004