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DEFINITY Enterprise Communications Server Release 8.2
Upgrades and Additions for R8r
555-233-115
Issue 1
April 2000
Troubleshooting an Upgrade
B-5New for Release 8
B
A -48V to +12V converter circuit on the TN2211 Optical Drive circuit pack
provides power for both the Optical Drive and the Disk Drive. The presence of
+12V on these circuit packs is monitored separately by maintenance software so
that a failure of the +12V converter on the Removable Media circuit pack can be
identified or ruled out as the source of the problem when the Disk Drive loses
+12V power.
The Host Adapter circuit pack, Removable Media Drive circuit pack, and Disk
circuit pack are treated as separate, but related, maintenance objects
(H-ADAPTR, R-MEDIA, 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 Removable Media (R-MEDIA) and
Disk (DISK) maintenance objects are also placed in a maintenance busyout
state.
Figure B-2. Mass Storage System interactions
Switch
processor
System
memory
System bus
Host
adapter
MSSNET
circuit
pack
SCSI bus
Private bus
Disk
circuit
pack
Disk
drive
Tape
drive
Optical
drive
Disk Tape
Optical
disk
Tape
circuit
pack
Optical
drive
circuit
pack
+12V
SPE
Mass
storage
system
cydfmass LJK 092999