DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1630TAPE
9
The Host Adapter Circuit, Tape circuit pack, and Disk circuit pack are treated as
separate, but related, maintenance objects (H-ADAPTER,TAPE, and DISK). Since
the Disk circuit pack is controlled by SCSI commands which are generated by
the Host Adapter, problems with the Host Adapter can prevent communications
with the Disk. Whenever the Host Adapter is taken out of service by the
busy-out
host-adapter
command, or due to failure of a critical Host Adapter test, the Tape
and Disk maintenance objects are also placed in a maintenance busyout state.
Figure 9-102. Mass Storage System Interactions
General Repair Procedures for TAPE
The following guidelines should be followed when troubleshooting and resolving
tape problems.
1. Cleaning the tape drive head is very important. Dirty tape drive heads may
cause problems that appear to be hardware related.
Switch System
Processor Memory
SPE
System Bus
SCSI BUS
MSSNET
Circuit HOST
Pack ADAPTER
(UN332) Private Bus
Mass
Storage
System
+ 12 V
DISK DISK TAPE TAPE
Circuit DRIVE DRIVE Circuit
Pack
Pack
(TN1657) DISK TAPE (TN1656)
