Chapter 10: Path Failover
Configure Control Path
Quantum Scalar i6000 User’s Guide 365
• Both control path failover drives must be licensed for path failover
(see
License Drives for Path Failover on page 359).
• The tape drives must be HP LTO-5 or later Fibre Channel drives.
• The tape drives must be connected to an Ethernet Expansion Blade.
• The tape drives must be connected to the same Fibre Channel
switch that supports N-port ID Virtualization (NPIV).
• The tape drives must NOT be connected to an FC I/O blade.
• The tape drive topology must be set to Point-to-Point (see
Configuring Fibre Channel Drive Speed, Topology, and Loop ID on
page 202).
• Two (2) or more HP LTO-5 or later drives must be in the same
partition.
Configuration Guidelines
When a logical library partition’s media changer control path is
configured via a control path drive, the library control path is hosted by
the drive’s physical FC port and uses the same World Wide Port Name
(WWPN) associated with the selected tape drive. While the tape drive
(SSC device) responds as LUN 0 at the WWPN, the partition media
changer (SMC device) responds as LUN 1 at the WWPN.
For example, consider such a drive configured to host the library control
path. A switch could detect the tape drive as LUN 0 with WWPN
500308c0:9e2c3001 and detect the media changer as LUN 1 with
WWPN 500308c0:9e2c3001 also via switch port 1:
[11:0:0:0] tape fc:0x500308c09e2c3001,
0x010100 /dev/st0 /dev/sg2
[11:0:1:1] mediumx fc:0x500308c09e2c3001,
0x010101 /dev/sg3
If the logical library partition configures two drives for basic library
control path failover functionality, then the library control path will be
able to fail over to the configured redundant failover drive. In this type
of configuration, the library control path is not hosted by a drive’s
physical FC port, but via a virtual port with a unique WWPN, reporting
the SMC device also as LUN 0, not LUN 1.
Virtual port WWPNs are based on the library’s WWNN and are identified
by the WWPN’s last 12 bits. A partition’s control path configured via a
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