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 pac k, and Disk circuit p ack are treated as
separate, but related, maintenanc e objects (H-ADAPTER,TAP E , and DISK). Since
the Disk circuit pac k is controlled by SCSI commands whic h are generated by
the Host Adapter, prob lems with the Host Adapter can p revent communications
with the Disk. Whenever the Host Adapter is taken out of servic e by the busy-out
host-adapter command, or due to failure of a critical Host Adapter test, the Tape
and Disk maintenance objec ts 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 tap e drive heads may
cause problems that ap pear 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)