DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-540DISK (MSS Disk Circuit Pack)
9
DISK (MSS Disk Circuit Pack)
The TN1657 Disk circuit pack is part of the Generic 3r Mass Storage System
(MSS). The MSS provides non-volatile storage for system software, translation
data, announcement data and program update data. As shown in Figure 9-25
,
the MSS consists of a Host Adapter circuit on the UN332 MSS-Network Control
circuit pack (MSSNET), a Small Computer System Interface (SCSI) bus, a
TN1656 Tape circuit pack and the TN1657 Disk Drive circuit pack. The Disk Drive
acts as the primary storage device and the Tape Drive serves as a backup
device.
The system is usually booted from the bootimage stored on disk. The
save
translation
and
save announcements
commands save to disk the
memory-resident translation data and TN750-resident announcement data,
respectively. The
backup disk
command copies data from the disk to the tape
for backup storage. The
restore disk
command copies data from the tape back
to disk. All MSS components reside in the SPE, or PPN control carrier (carrier A
for a simplex SPE, carriers A and B for a duplicated SPE).
The Disk Drive circuit pack contains SCSI bus terminators, an industry standard
SCSI-based Disk Drive, and interface circuitry to the private bus to control the
LEDs, detect the presence of the circuit pack, and identify the vintage of the
hardware.
A -48V to +12V converter circuit on the Tape circuit pack provides power for both
the Tape 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 Tape 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, 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.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run
1
1. In a system with a simplex SPE, the carrier does not have to be specified. In a system
configured with duplicated SPEs, the carrier (a or b) must be specified.
Full Name of MO
DISK WARNING test disk a|b long MSS Disk Circuit Pack
DISK MINOR test disk a|b long MSS Disk Circuit Pack
