User's Manual

1. Examine the library event or RAS ticket indicating that failover has occurred. The Serial # is
that of the tape drive with the failed path and the tape drive coordinates indicate the physical
location of the drive. (See information about Tape Drive Location Coordinates in the library
user guide.)
2. Use host utilities to confirm the failure.
• On Windows, use the diagnostic application.
1. Launch the application, or if it is already running go to Actions→Refresh Cached
Driver Data (F5).
2. In the Devices pane, locate the drive whose serial number matches that from the
support ticket. Select the device.
3. In the Paths pane, confirm that not all of the ports are available.
• “Linux command line user interface” (page 44)
• “HP-UX commands for viewing tape and library devices” (page 48)
3. Locate the failed connection or SAN component.
a. Using the location coordinates of the drive, locate the drive and examine the two Status
LEDs labeled “Port 1” and “Port 2.” If either of those LEDs is off, the port with the unlit
LED is the failed link.
b. If the status LEDs are both lit and the library is connected to an external switch, use the
Fibre Channel switch management feature to locate ports that are not functioning.
c. Examine the Fibre Channel host bus adapters in the host. If one has a light that indicates
a malfunction, that might be the problematic link.
After correcting the connection problem, refresh the diagnostic application to confirm that all of
the expected failover paths are available on all devices.
Windows debugging logs and tools
Confirming failover operation
To confirm that the advanced path failover drivers have installed and are operating correctly, open
the system event viewer. See “Driver components” (page 37) for instructions on how to filter out
irrelevant events. The following events should be present; the first event in this list will be the first
to occur after system restart:
Path failover driver loadedHPtapeFailover_filt
Path failover driver loadedHPtapeFailover_mpio
Followed by one instance of the following message for each active path:
Path failover session established…HPtapeFailover_mpio
For more details on which paths are active and passive, use the diagnostic application (see
“Windows Advanced Failover Diagnostic Application” (page 56)).
54 Troubleshooting failover operation