IBM Power Series Handbook page 78

Note: In location codes, the U is a constant digit; however, the numbered positions following the U are
variables and are dependent on your server. Each column defines the numbers that follow the U in the
beginning of the location code.
Machine type and model number in a location code
Utttt.mmm.sssssss-A1
The leftmost code is always U.
tttt represents the unit type of the enclosure (drawer or
node).
mmm represents the model of the enclosure.
sssssss represents the serial number for the enclosure.
Note: The mmm or ccc number might not be displayed on all location codes for all servers. If the mmm value is not
displayed, the location code is displayed in one of the following forms:
v Utttt.sssssss-A1
v Uffff.sssssss-A1
The location code is hierarchical; that is, each location identifier in the string represents a physical part.
The order (from left to right), in which each identifier is shown, allows you to determine which parts
contain other parts in the string.
The dash (-) separator character represents a relationship between two components in the unit. In the
example of the fan, whose location code is Un-A1, the dash shows that the fan (A1) is contained in the
base unit (or Un). Modules, adapters, cables, and devices are all parts that are plugged into another part.
Their location codes always show that they are plugged into another part as components of the server.
Another example follows:, Un-P1-C9 is a memory DIMM, with memory DIMM (C9) plugged into a
backplane (P1), which is inside the unit (Un).
Note: For devices, certain error conditions might cause an IBM i device to display the device location in
an AIX format.
Table 19. Unit type and locations
Unit type (Utttt.mmm)
U78C0.001
Location code labels
The location code label represents a physical part of the server. The following table describes the prefixes
of location code labels.
Note: These labels apply to system units only.
Table 20. Prefixes of location code labels for system units
Prefix Description
A Air-moving device
C Card connector
D Device
E Electrical
L Logical path SAS target
N Horizontal placement for an empty rack location
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Finding parts, locations, and addresses
Link to location information
9117-MMB or 9179-MHB Locations
Feature codes and sequence numbers in a location code
Uffff.ccc.sssssss-A1
The leftmost code is always U.
ffff represents the feature code of the enclosure (drawer
or node).
ccc represents the sequence number of the enclosure .
sssssss represents the serial number of the enclosure.
Example
Fan, blower
IOP, IOA, DIMM, processor card
Diskette, control panel
Battery, power supply, ac charger
Integrated drive electronics (IDE) address, Fibre
Channel LUN