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8.9.4 Upgrading a TL895
The TL985 DLT automated tape library can be upgraded from two or
five tape drives to seven drives with multiple DS-TL89X-UA upgrade
kits. Besides the associated documentation, the upgrade kit contains one
TZ89N-AV tape drive, a SCSI bus terminator, a SCSI bus jumper (part
number 6210567) so you can place more than one drive on the same SCSI
bus, and other associated hardware.
Before the drive is physically installed, set the SCSI ID rotary switches
(on the library printed circuit board) to the same SCSI ID that will be
electronically set. After the drive installation is complete, set the electronic
SCSI ID using the Configure menu from the control panel (see Section 8.9.2).
The actual upgrade is beyond the scope of this manual. See the TL895 Drive
Upgrade Instructions manual for upgrade instructions.
8.9.5 Connecting the TL895 Tape Library to the Shared SCSI Bus
The TL895 tape library has 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
TL895 tape libraries must ensure that the tape libraries are on the end of
the shared SCSI bus.
In a TruCluster Server cluster with a TL895 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, because the TL895 cannot be removed from the shared SCSI bus,
all ASE services that use any shared SCSI bus attached to the TL895 must
be stopped before the tape loader can be removed from the shared bus.
To add a TL895 tape library to a shared SCSI bus, select the member system
or storage device that will be the next to last device on the shared SCSI bus.
Connect a BN21K or BN21L cable between a trilink or Y cable on that device
to the appropriate tape library port.
8.10 Preparing the TL893 and TL896 Automated Tape
Libraries for Shared SCSI Bus Usage
The topics in this section provide information on preparing the TL893 and
TL896 Automated Tape Libraries (ATLs) for use on a shared SCSI in a
TruCluster Server cluster.
8–40 Configuring a Shared SCSI Bus for Tape Drive Use