Location Codes And Identification Labels; Location Code Format For Scsi Devices; Location Code Format For, 7135, 9333, And 9334 Expansion Units - IBM R30 Operator's Manual

Location Codes and Identification Labels

Note: The SCSI drawer is optional in a rack with a CPU Enclosure.
Several types of labels identify the locations of adapters and devices within the system unit.
Numbers on these labels correspond to the location codes that are displayed when the
diagnostic programs isolate a problem.
A location code is used to find the location of a failing device or unit. The location code is
displayed along with the SRN when the diagnostic programs isolate a failure. If the location
code is not known, you can run the Display Previous Diagnostic Results service aid to
display the results of the last time the diagnostic programs were run.
The rack has several labels on the drawers and devices. These help the operator and
service person identify various drawers and devices. The drawer ID should match the slot
location of the adapter that drives it. The SCSI devices may be labeled with a number that
identifies the SCSI address of the device.

Location Code Format for SCSI Devices

The following diagram shows the format of location codes for SCSI drawers.
AB - CD - EF - GH
To aid the operator and service person, the rack-type system unit has several identification
labels on drawers and devices. The drawer ID should match the slot location of the adapter
that drives it. SCSI devices may be labeled with a number that identifies the SCSI address
to which the device is set.

Location Code Format for, 7135, 9333, and 9334 Expansion Units

The location code formats for the 7135, 9333, and 9334 expansion units are described in
the publications for the 7135, 9333, and 9334 SCSI expansion units.
,HHH is the logical unit number of the device shown in decimal.
SCSI address of the device.
00 - Internal SCSI bus connector.
01 - External SCSI bus connector of a non-integrated
SCSI controller.
0S - External bus connector of an integrated SCSI
controller,
Slot number of the SCSI controller. For the IBM 7012
direct bus attach disk drive, 7 is the rear drive and 8 is
the front drive.
Always 0.
Always 00.
4-13
AC Rack Description