3.7.0 HP StorageWorks HP Scalable NAS File Serving Software administration guide - HP Scalable NAS 3.7 for Linux (AG513-96002, October 2009)

When a failure occurs on the Primary, the virtual host needs to fail over to a backup.
HP Scalable NAS now looks for the best location for the virtual host. Because the
probe status on the first backup is “down,” HP Scalable NAS selects the second
backup, where the probe status is “up.”
At i5 in the following example, the probe fails on the Primary. At i6, the virtual host
is deconfigured on the Primary. At i7, the monitor stop script begins on the Primary.
At i8, the virtual host is configured on the second backup. At i9, the monitor start
script begins on the second backup. At i10, probing begins on the second backup.
Advanced monitor topics350