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

Chapter 15: Advanced Topics 148
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.
When a failure occurs on the Primary, the virtual host needs to fail over to
a backup. HP Clustered File System now looks for the best location for
the virtual host. Because the probe status on the first backup is “down,”
HP Clustered File System chooses the second backup, where the probe
status is “up.”
Primary
First Bac kup
Second Backup
Vhost status
Probe status
Monitor activity
inactive
unknown
stopping
active
up
undefined
active
starting
Vhost status
Probe status
Monitor activity
inactive
unknown
stopping
undefined
inactive
down
Vhost status
Probe status
Monitor activity
inactive
unknown
undefined
inactive
up
stopping
i1 i2 i3 i4
Time