Installation Planning; Determining The Number Of Logical Libraries (Partitions); Basic Guidelines; Library Sharing - IBM TS3100 Setup, Operator, And Service Manual

Installation planning

Before installing your library, take time to review the following information.

Determining the number of logical libraries (partitions)

You can partition the library into as many logical libraries as there are drives in the library.

Basic guidelines

v Each logical library must contain at least one drive.
v A library configuration of exactly one logical library equals the entire physical library.
v The library issues a warning to the user if media is moved across logical libraries.

Library sharing

The library's default configuration allows a single application to operate the library through a single
control path. Often, it is advantageous to share a single library between heterogeneous (dissimilar) or
homogeneous (similar) applications. Some applications (and some servers) do not allow for sharing a
library between systems. Configurations are created that enable the library to process commands from
multiple heterogeneous applications (such as an IBM System p application and a Windows NT
application) and multiple homogeneous applications (, the same application that is run by several System
p servers).
From the library's Web User Interface or Operator Control Panel, the following actions are completed:
v Configure the library so that it is partitioned into separate logical libraries that independently
communicate with separate applications through separate control paths. This configuration requires no
special capabilities from the server or application. See "Multiple logical libraries for library sharing."
v Configure any single logical library (including the entire physical library) so that it is shared by two or
more servers that are running the same application. Depending on the capabilities of the server and
application, several ways to set up this type of configuration are available. Three typical ways include:
– Configuring one server (host) to communicate with the library through a single control path; all
other servers send requests to that server through a network. This configuration is used by Tivoli
Storage Manager (TSM).
– Configuring all of the servers to communicate with the library through a single, common control
path. This configuration is used in high-availability environments such as IBM's High Availability
Clustered Microprocessing (HACMP) and Microsoft Systems Management Server (SMS) and
Clustered Server Environments. Multi-initiator configurations are supported only by certain adapters
and independent software vendors (ISVs). Check with your ISV.
– Configuring a single logical library to communicate with multiple servers through multiple control
paths. This configuration requires that control paths be added (see "Multiple control paths" on page
28). It is used by Backup Recovery and Media Services (BRMS).
Library configuration is not limited to these examples. Many configurations are possible, and can be
designed according to your business needs. Refer to your host application documentation.

Multiple logical libraries for library sharing

Multiple logical libraries are an effective way for the library to simultaneously back up and restore data
from heterogeneous applications. For example, the library is partitioned so that it processes:
v Commands from Application A (about Department X) in Logical Library 1
v Commands from Application B (about Department Y) in Logical Library 2
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