4.1.0 HP PolyServe Matrix Server administration guide (T5392-96073, October 2010)

When you configure the monitor, you will be asked for the network address of a
router or other gateway probe device. The IP address of the device should be on a
different subnet than the servers in the matrix. The device should respond to a ping
and should be visible on each server.
After the gateway device monitor is configured on a server, it pings the gateway
device periodically. If a network failure occurs and the ping fails, any active virtual
hosts on the server will become inactive and fail over to another server.
NT device monitor
The NTSERVICE device monitor is configured for a specific NT service. When the
device monitor instance becomes active, it will start the NT service if it is not already
started. When the device monitor instance becomes inactive, the monitor stops the
NT service if the probe type for the monitor is set to Single-Probe. When you configure
the monitor, you will need to indicate whether dependent services of the NT service
should also be started and stopped.
When the monitored NT service is started on a server, it is provided with four
environment variables that are set as follows:
• COMPUTERNAME = <virtual host IP address>
• _CLUSTER_NETWORK_FQDN_ = <virtual host IP address>.<domain-
name>
• _CLUSTER_NETWORK_HOSTNAME_ = <virtual host IP address>
• _CLUSTER_NETWORK_NAME_ == <virtual host IP address>
The monitor probe queries the status of the NT service. If the status is
SERVICE_RUNNING, the service status remains Up. If the status does not indicate
that the NT service is running, the service status is set to Down.
The NTSERVICE monitor is also available as a service monitor. When deciding
whether to create a service monitor or a device monitor, consider the effect that you
want the monitor to have on the matrix. If you want a single virtual host to be
associated with the monitor, create a service monitor. If you want multiple virtual
hosts, or no virtual hosts, to be associated with the monitor, create a device monitor.
SHARED_FILESYSTEM device monitor
If you have created a virtual host for applications that obtain their data from a PSFS
filesystem, or if you just want to monitor access to a PSFS filesystem, you can use the
SHARED_FILESYSTEM device monitor to ensure that the filesystem is healthy and the
virtual host remains available.
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