Sun Microsystems SL500 manual Partitions and Library Resources, Library Resource Addresses

Partitions and Library Resources

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.

96116 • Revision: KA Chapter 6 Library Partitioning 149