Quantum Scalar i6000 User Manual page 388

Chapter 10: Path Failover
Configure Control Path
370
• All control path failover drives must be licensed for SNW (see
License Drives for Path Failover
• The tape drives must be HP LTO-6 or later Fibre Channel drives.
• The tape drives must be connected to an Ethernet Expansion blade.
• The tape drives can be connected to the same or different Fibre
Channel switch.
• 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
page 202).
• The APFO driver must be installed on the host(s).
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]
0x010100
[11:0:1:1]
0x010101
If the logical library partition is configured for advanced control path
failover functionality, the managing APF device driver will select a
redundant path and request that the library enable the redundant path
as the active control path. In this case, the current path is disabled and
the new path is enabled, resulting in the existing LUN 1 for the current
active path to disappear and a LUN 1 activating the selected redundant
device.
on page 359).
tape fc:0x500308c09e2c3001,
/dev/st0 /dev/sg2
mediumx fc:0x500308c09e2c3001,
/dev/sg3
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