HP ProLiant DL380G5-WSS 3.7.0 HP StorageWorks HP Scalable NAS File Serving Sof - Page 349
The effect of monitors on virtual host failover, Service monitors
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The port or name of the service monitor. (Applies only to service monitors.) MX_NAME=name The name of the device monitor. (Applies only to device monitors.) HP Scalable NAS does not set any other variables. If a script requires a variable such as a pathname, the script will need to set it. 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 Scalable NAS needs to fail over a virtual host, it looks for the healthiest backup server. To make this determination, HP Scalable NAS 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. The probe mechanism is in one of the following states on each server: Up, Down, Unknown, Timeout. A service monitor also has an activity status on each server. The status can be one of the following: Starting, Active, Suspended, Stopping, Inactive, Failure. The following examples show state transitions for a service monitor that uses the default values for autorecovery, priority, and serial script ordering. Start and Stop scripts are also defined for the monitor. The virtual host associated with the monitor has a primary interface and two backup interfaces. The first example shows the state transitions that occur at startup from an unknown state. At i1, all instances of the monitor have completed stopping. At i2, the virtual host is configured on the Primary. At i3, the monitor start script begins on the Primary and probing begins on the backups. At i4, probing begins on the Primary. HP Scalable NAS File Serving Software administration guide 349