HP StorageWorks Clustered File System 3.2.1 Windows Storage Server Edition Administration Guide (February 2006)

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Advanced Topics
The topics described here provide technical details about HP Clustered
File System operations. This information is not required to use HP
Clustered File System in typical configurations; however, it may be useful
if you want to design custom scripts and monitors, to integrate HP
Clustered File System with custom applications, or to diagnose complex
configuration problems.
The Effect of Monitors on Virtual Host
Failover
Typically a virtual host has a primary network interface and one or more
backup network interfaces. On the servers supplying the interfaces, the
state of the virtual host is either active or inactive.
When HP Clustered File System needs to fail over a virtual host, it looks
for the healthiest backup server. To make this determination, HP
Clustered File System considers the state of any service or device
monitors associated with the virtual host.
Service Monitors
Service monitors are configured on a virtual host. The service to be
monitored is expected to be running simultaneously on the primary
server and on the backup servers associated with the virtual host. The
monitor uses a probe mechanism to determine whether the service is up.