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other drive to be daisy chained. Use the SCSI jumper cable to connect the
two drives and place them on the same SCSI bus.
______________________ Notes ______________________
We recommend that you not place more than two TZ89 tape
drives on any one SCSI bus in these tape libraries. We also
recommend that storage be placed on shared SCSI buses that
do not have tape drives.
Therefore, we do not recommend that you reconfigure the TL894
tape library into the one-bus configuration.
Appendix B of the TL81X/TL894 Automated Tape Library
for DLT Cartridges Facilities Planning and Installation Guide
provides figures showing various bus configurations. In these
figures, the configuration changes have been made by removing
the terminators from both drives, installing the SCSI bus jumper
cable on the drive connectors vacated by the terminators, then
installing an HD68 SCSI bus terminator on the SCSI bus port
connector on the cabinet exterior.
This is not wrong, but by reconfiguring in this manner, the
length of the SCSI bus is increased by 1.5 meters, and may cause
problems if SCSI bus length is of concern.
In a future revision of the previously mentioned guide, the bus
configuration figures will be modified to show all SCSI buses
terminated at the tape drives.
8.8.4 Connecting the TL894 Tape Library to the Shared SCSI Bus
The TL894 tape libraries have up to 3 meters of internal SCSI cabling per
SCSI bus. Because of the internal SCSI cable lengths, it is not possible to
use a trilink connector or Y cable to terminate the SCSI bus external to the
library as is done with other devices on the shared SCSI bus. Each SCSI bus
must be terminated internal to the tape library, at the tape drive itself with
the installed SCSI terminators. Therefore, TruCluster Server clusters using
the TL894 tape library must ensure that the tape library is on the end of
the shared SCSI bus.
In a TruCluster Server cluster with a TL894 tape library, the member
systems and StorageWorks enclosures or RAID subsystems may be isolated
from the shared SCSI bus because they use trilink connectors or Y cables.
However, the ASE must be shut down to remove a tape loader from the
shared bus.
8–34 Configuring a Shared SCSI Bus for Tape Drive Use