3X-KZPEA Release Notes, June 2006

15
Shared Tape Support
In addition to supporting shared disks the KZPEA can also be used to share a single tape drive between two
systems under Tru64 UNIX. Only specific tape drives are supported in the shared bus environment as listed
below:
HP StorageWorks SDLT 320 GB Tape Drive
HP StorageWorks SDLT 600 GB Tape Drive
HP StorageWorks Ultrium 448 Tape Drive
Both the external and internal models of these tape drives are supported. The internal models are supported only
when installed in one of the Rack-Mount Tape Drive kits listed below:
HP StorageWorks 1U Rack-Mount Kit A7445B
HP StorageWorks 3U Rack-Mount Kit 274338-B22
The internal SDLT 600 is supported in the 3U Rack-Mount Kit, but the external SDLT 600 is not supported in a
shared bus environment. Refer to your system support statement for a current list of supported tape drives.
The configuration of one of these tape drives in a shared bus environment is very similar to the configuration
used to share disk drives. There are two possible shared tape configurations (A and B).
Note: Configuration A is OBSOLETE and not recommended for new installations. This configuration was only
supported for the SDLT 320 GB Tape drive. SDLT 600 and Ultrium 448 drives must use Configuration B.
Tape Configuration A (Obsolete)
(SDLT 320 only)
Configuration A (Figure 4), which is an obsolete configuration, requires the use of Y-cables at each node
with one adapter being in the middle of the bus. The on-board termination of both adapters in both nodes
must be disabled for each channel used in a shared bus configuration. Termination is disabled by removing
jumper J5 for SCSI Channel 1/A and jumper J3 for SCSI Channel 2/B, and also setting the Host Adapter
SCSI Termination to “Low OFF/High OFF” for Channel 1/A and “Disabled” for Channel 2/B with the SCSI
Configuration Utility.
Refer to the KZPEA User Guide regarding operation of the adapter’s onboard SCSI Configuration Utility.
Note: For shared bus configuration only, please disregard the “SCSI Termination” paragraph under
section 2.1.2 of the KZPEA User Guide which states that the adapter can only be located at the end
of the bus, requiring jumpers J3 and J5 to be installed.
Termination will be supplied at the tape drive on one end of the bus and by an external terminator at the other
end of the bus. Please refer to the documentation for your tape drive to determine how to terminate the SCSI bus
at the tape drive.