IBM System Storage TS3500, Введение и руководство по планированию

Страница: 67 / 290

Using multiple logical libraries
To maximize your investment, you can use multiple logical libraries to share the
physical TS3500 Tape Library between applications or to support mixed drive
types for any application. The sections that follow give guidelines for both
processes.
You can create multiple logical libraries by partitioning the physical library's
storage slots and tape drives into two or more logical libraries. Each logical library
consists of:
v
Tape drives
v
Storage slots
v
Input/Output (I/O) slots
v
Cartridge accessor
Each logical library has its own control path. A control path is a logical path into
the library through which a server sends standard SCSI Medium Changer
commands to control the logical library. For frames that contain Ultrium tape
drives and frames that contain 3592 tape drives, each logical library control path is
available to servers through logical unit number (LUN) 1 of the first drive that is
defined within that logical library. A LUN is a number used by a server to identify
a drive.
In a TS3500 Tape Library with ALMS, a logical library can share the tape drives
and storage slots of another logical library. The library also shares the I/O slots
and the cartridge accessor on a first-come, first-served basis. However, a logical
library cannot include both LTO and 3592 elements. That is, you must configure
LTO and 3592 elements (drives, storage slots, I/O slots, and grippers) into separate
logical libraries.
A frame that uses Ultrium tape drives can be partitioned into up to 12 logical
libraries. A frame that uses 3592 tape drives can also be partitioned into up to 12
logical libraries.
Note: When naming logical libraries, developing an enterprise-wide library
naming convention leads to easier management of the libraries. See the appropriate
section in the
IBM System Storage TS3500 Tape Library with ALMS Operator Guide for
more information.
Certain configuration prerequisites exist when using encryption in your library. For
an overview of these rules, see “Configuration prerequisites for encryption” on
page 219.
To create or change the configurations for your TS3500 Tape Library, see the IBM
System Storage TS3500 Tape Library with ALMS Operator Guide .
With automatic cleaning, any appropriate cleaning cartridge can be used to clean a
drive in any configured logical library, even if the cartridge resides in a different
logical library.
The following sections describe two uses for multiple logical libraries.
Using multiple logical libraries for library sharing
Multiple logical libraries are an effective way for the TS3500 Tape Library to
simultaneously back up and restore data from heterogeneous applications. For
example, you can partition the library so that it processes commands from
Chapter 1. Introduction
43