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

Chapter 11: Configure Service Monitors 105
Similarly, if a server is removed from the configuration, the service
monitors assigned to the virtual host are automatically removed from
that server. Service monitor parameters (such as probe severity, Start
scripts, and Stop scripts) are consistent across all servers configured for a
virtual host.
Service Monitors and Failover
If a monitored service fails, HP Clustered File System attempts to relocate
any virtual hosts associated with the service monitor to a network
interface on a healthier server. However, if there are multiple failures in
the cluster or the virtual host does not have a backup network interface
on another server, HP Clustered File System may not be able to move the
virtual host. The virtual host may then remain active on a server with a
failed monitored service. HP Clustered File System will avoid this
situation if there is a healthy server configured and available, but
sometimes it may not be possible in a multiple-failure scenario.
Types of Service Monitors
HP Clustered File System supports the following service monitors. When
you configure a monitor, you will need to supply the following
information.
Type Port
Default
Probe
Timeout
Default
Probe
Frequency Script Parameters
DNS 53 5 seconds 30 seconds address to resolve
FTP 21 5 seconds 30 seconds none
HTTP 80 5 seconds 30 seconds URL
HTTPS 440 5 seconds 30 seconds URL
IMAP4 143 5 seconds 30 seconds none
NNTP 119 5 seconds 30 seconds none
POP3 110 5 seconds 30 seconds none
SMTP 25 5 seconds 30 seconds none