Sun Microsystems StorageTek Modular Library System SL500 - Manual (Page 182)

Partitions and Library Resources
150 SL500 User’s Guide • July 2008 Revision: KA • 96116
SCSI element numbering uses a single integer to identify each library resource. SCSI
element numbering within partitioned libraries is continuous for each partition, even if
cell locations for the partition are not adjacent. SCSI element addresses for a partition
start at the lowest module, row, and column within the partition, then proceed by row
until the end of the column, then increment by column until the end of the module.
When additional resources are allocated to an existing SCSI partition, the original
resources are not renumbered. This helps to minimize disruption to the SCSI host.
SCSI Element Address Examples
If a library’s base and storage expansion modules are allocated to Partition 1 and the
drive module is allocated to Partition 2, SCSI element numbering is as follows:
■
Numbering for Partition 1 begins at the first available storage cell in the Base
Module and continues through the last available cell in the storage module cell.
■
Numbering for Partition 2 begins with the first available storage cell in the drive
module PRC Address and ends with the last available cell in that module.
Storage Cells and Drives
All storage cells, tape drives, and cartridges allocated to a partition are owned
exclusively by the assigned host and cannot be accessed by other hosts. For example, if
a group of tape drives is allocated to a partition, only the host assigned to that partition
can use those drives.
Storage cells and drives that are not allocated to any partition cannot be accessed at all.
For example, you can leave an area of cells unallocated in preparation for a planned
future partition.
On the SL Console screens and reports, storage cells and drives appear in any of the
following states:
■
Allocated—Assigned to the current partition.
■
Unallocated (or Unassigned)—Not assigned to any partition; available to be assigned
to any current partition.
■
Unavailable—Assigned to another partition.
■
Not accessible—Not available for host operations; for example, cells reserved for
diagnostic cartridges, cells that are physically blocked.
Note – HandBots are shared resources and cannot be allocated exclusively to a
partition.
To display partition assignments for storage cells and drives, see
“Partitions—Reports—Cartridge Cell and Media Summary” on page 229 .