Sun Microsystems StorageTek SL500, User Manual

Page: 181 / 436

Partitions and Library Resources
96116 • Revision: KA Chapter 6 Library Partitioning 149
Partitions and Library Resources
Library Resource Addresses
Resource addresses uniquely identify each resource (storage cells, drives, and CAP
cells) within the library. The SL500 library and attached hosts use the following
addressing schemes:
■
Library Internal Address
■
Host SCSI Element Address
Each partition appears to a host as a separate library; this is reflected in the partition
address.
Library Internal Address
The library internal address is used by the SL500 library controller and the SL Console
device tree to identify the physical location of each resource. The addressing scheme
used by the SL500 is a four-digit, comma-separated value, specifying the library,
module, row, and column, as viewed from inside the library, facing the drive bays. This
addressing scheme is commonly referred to as the LMRC address.
The format of the SL500 LMRC address is l , m , r , c where:
■
l = library or partition number. In partitioned libraries, l is the partition ID (1–8). In
non-partitioned libraries, l is always “0”.
■
m = module number (1–5). The Base Module is 1, additional drive expansion and
storage expansion modules are 2–5.
■
r = row number. Numbered consecutively from the top, down, with row 1 at the top.
■
c = column number, as follows:
■
Base module, left side of library = 1–4
■
Base module, right side of library = 5–8
■
DEM (Drive Expansion Module) drive column, rear of library = 9
■
CEM (Cartridge Expansion Module) columns, rear of library = 9–11
Internal Address Examples
■
If the entire Base Module is allocated to Partition 1, the internal address for a
cartridge in row 8, column 1 in the Base Module is: 1, 1, 8, 1.
■
If the entire CEM is allocated to Partition 2, the internal address for a cartridge in
row 10, column 1 is: 2, 2, 10, 1.
Host SCSI Element Address
The element address is used by hosts to uniquely identify each library resource
available to the host.