HP StoreEver MSL6480 Tape Library User and Service Guide Addendum (QU625-96016, October 2013)

Figure 11 Library world wide name displayed on the Status > Library Status screen
• Hosts connecting to the library might need to be rebooted if the operating system does not
support dynamic device detection.
• Applications on hosts might need to be reconfigured to recognize the new library world wide
name.
Verifying control path failover
After enabling control path failover, verify the configuration of both ports. To verify both paths,
first verify that the hosts configured for access to the library are able to communicate with the
library. It might be necessary to modify switch zoning to enable access to the library. After host
access has been verified use the library front panel or RMI to power off the drive marked as Basic
(Active) in Status > Drive Status. If the library has multiple partitions, verify control path failover for
each partition.
After the library has powered off the active drive, the Library LUN indicator should move to the
passive drive. When the library has reported that the drive has been successfully powered off and
the LUN indicator has moved to the passive drive, verify that host connectivity to the library has
not changed. It might be necessary to configure switch zoning to allow host access.
After verifying library connectivity using each of the library control paths, the library control path
may be moved back to the original drive if so desired by clicking Failover on the Configuration >
Drives > Manual Control Path Failover screen.
Hardware-specific requirements
Brocade switches
For best reliability when control path failover is used Brocade switches should be running version
3.2.2e, 3.4.1b, or newer.
Cisco switches
Some Cisco switches that support NPIV do not have NPIV enabled by default. The Cisco MDS9148
may disable NPIV when power cycled.
To enable NPIV on a Cisco switch use: Cisco_Device_Manager > Admin > Feature_Control or use
the Cisco CLI commands show npiv status and npiv enable.
20 Basic control path and data path failover