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Addressing SSA Disk Drives
This section describes how SSA devices and adapters are known to the using system
programs. The AIX system uses this information to configure the 7133 to the system.
Location Code Format
Location codes identify the locations of adapters and devices in the using system and
its attached subsystems and devices. These codes are displayed by the service aids,
and when the diagnostic programs isolate a problem. For information about the location
codes that are used by the using system, see the Operator Guide for the using system.
This section shows the location codes for the 7133.
A B
-
Pdisks, Hdisks, and Disk Drive Module Identification
The physical disk drives (pdisks) in an SSA subsystem can be configured as logical
units (LUNs). A LUN is also known as an hdisk, and can consist of one or more
physical disk drives. An hdisk in an SSA subsystem might, therefore, consist of one
pdisk or several pdisks.
The configuration software also allocates an identification (hdisk and pdisk number) to
each disk drive module during the configuration of the SSA loop. The disk drive
modules do not have fixed physical addresses.
The numeric identifiers of pdisks, hdisks, and the disk drive module slots of a 7133 are
not related to each other. For example, pdisk1 is not necessarily installed in slot 1 of
the 7133.
C D
-
E F
G
H
-
I
J
Disk drive module slot number
1 through 16 (decimal)
Enclosure ID
(the four characters that appear in
the display at the front of the 7133)
Adapter position
(number of the slot, 1 through 8,
containing the SSA adapter)
System I/0 Bus identifier
Expansion adapter position
Expansion drawer
Appendix A. Additional Information for RISC Systems
255
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