Working With Logical Libraries; Automatically Creating Logical Libraries - IBM System Storage TS3310 Setup And Operator Manual

communicate with a tape drive at a specific SCSI ID, but that SCSI ID might
already have been configured for use in another logical library.
Note: SCSI tape drives use SCSI IDs that are limited to a numerical value between
For more information on drive IDs, refer to "Determining SCSI and Fibre Channel
IDs" on page 2-4

Working with Logical Libraries

Logical libraries are virtual sections within a library that present the appearance of
multiple, separate libraries for purposes of file management, access by multiple
users, or dedication to one or more host applications. By default, the library has
one logical library, which includes all of the library's resources.
There are two ways to create logical libraries:
v Automatically - where the library divides the available resources equally among
v Manually - where an administrative user assigns the number of slots per logical
Note: When changing the logical library mode from online to offline, all host
Administrative users can create, modify, delete, and control access to all logical
libraries. Users can be given access to only certain logical libraries and denied
access to others.
At a minimum, a logical library consists of one tape drive and one slot. The tape
drive or slot cannot be shared with another logical library (an exception to the
sharing restrictions are cleaning cartridges, which can be shared among all logical
libraries). I/O Station slots and cleaning slots are shared between all logical
libraries.
Each logical library is specific to a tape drive interface (for example, SCSI or Fibre
Channel). Mixed media is allowed within logical libraries. For example, a logical
library can contain LTO 2 and LTO 3 tape cartridges.

Automatically Creating Logical Libraries

When the library automatically creates logical libraries, the available resources are
divided equally among the number of logical libraries created. Prior to creating
logical libraries, it is important to first designate the desired number of cleaning
slots and I/O slots (if an expansion module is present). This is necessary because
the Automatic Create Logical Library function will divide all available storage slots
among the chosen number of logical libraries.
From the Operator Panel, all remaining available resources are divided among the
number of automatically created logical libraries. Use the Web User Interface (UI)
to manually create logical libraries.
5-4
TS3310 Tape Library Setup and Operator Guide
0-15. Fibre Channel tape drives use Loop IDs that are limited to a numerical
value between 0-125.
the number of logical libraries chosen.
library. (This is only done through the Web User Interface.)
application commands in progress at the start of the mode change are
completed.