5190/5194 Modular Tape Subsystem Manual

Installing the Modular Tape Subsystem
5190/5194 Modular Tape Subsystem Manual—426878-002
3-6
Device IDs
Tape Drive CRU Placement
Tape drive CRUs are installed in the module and assigned device IDs according to the
following rules:
•
In modules containing one tape drive CRU (with or without an ACL), the drive is
placed on the left as you face the module.
•
In modules containing two tape drive CRUs where only one drive CRU has an
ACL, the ACL is placed on the left as you face the module.
•
When two tape drive CRUs in the same module are attached to the same 3216
tape controller in a NonStop Himalaya K-series server, the drive CRU on the left is
device ID 5 and the drive CRU on the right is device ID 4.
Figure 3-1 shows the tape drive CRU placement and device IDs for tape drive modules
arriving from the factory that connect to one 3216 controller.
If you replace one of two drive CRUs attached to a 3216 controller, you must check the
device ID and change it, if necessary, so that the drive CRUs do not have the same
device ID. See Checking and Setting the Device ID on page 3-41.
Figure 3-1. Drive Placement and Device IDs for Tape Drive CRUs Attached to a
3216 Controller
One Drive CRU, No ACL
Device ID 5
VST039.vsd
Two Drive CRUs, Two ACLs
Device ID 5
Device ID 4
Two Drive CRUs, One ACL
Device ID 5 Device ID 4
Two Drive CRUs, No ACLs
Device ID 5 Device ID 4
One Drive CRU, One ACL
Device ID 5