IBM RS6000 Service Guide - Page 119
P2-Z1-A3.1 LUN 1 at SCSI ID 3 on integrated SCSI bus 1 from Planar 2 - system rack
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Specifically, the format of a location code is defined as follows: pn[.n][- or /]pn[.n][- or /]... Where p is a defined alpha location type prefix, n is a location instance number, and [.n] is a sub-location instance number (where applicable). Sub-location notation is used only for location types which have clearly defined and limited expansion sites; for example, memory SIMMs slots on a memory card. Primarily, the [.n] sub-location notation is intended for use as an abbreviation of the location code in cases where: 1. Based on the device structure, the abbreviated sub-location code conveys the same information in a more concise form than an additional level of location identifier -- for example: P1-M1.4 (pluggable module 4 on Memory Card 1 on Planar 1), rather than P1-M1-M4 P1-C1.1 (pluggable CPU 1 on CPU Card 1 on Planar 1), rather than P1-C1-C1 P2-Z1-A3.1 (LUN 1 at SCSI ID 3 on integrated SCSI bus 1 from Planar 2), rather than P2-Z1-A3-A1 2. The sub-location is either a basic physical extension or sub-enclosure of the base location, but does not represent additional function or connectivity; for example, a drawer in a rack (U1.2) or a riser card on an I/O board (P2.1). Chapter 3. Error Code to FRU Index 3-47