IBM System Storage TS3500, Introduction And Planning Manual

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Library sharing
This section describes ways that you can configure the TS3500 Tape Library into
one or more logical libraries that can be shared by multiple applications.
The default configuration for the TS3500 Tape Library allows a single application
to operate the library through a single control path. Often, however, it is
advantageous to be able to share a single library between heterogeneous or
homogeneous applications. Some applications (and some servers) do not allow for
sharing a library between systems. With the TS3500 Tape Library, however, you can
create configurations that enable the library to process commands from multiple
heterogeneous applications (such as an IBM pSeries
®
application and a Windows
application) and multiple homogeneous applications (for example, the same
application run by several pSeries servers).
From the library's web interface or operator panel, you can perform the following
actions:
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 (see example
1
in Figure 11 on page 42) requires no
special capabilities from the server or application.
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, there are several
ways to set up this type of configuration. Three typical ways include:
– Configuring one server (mainframe host) to communicate with the library
through a single control path; all other servers send requests to that server
through a network (see example
2
in Figure 11 on page 42). 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 (see example
3
in Figure 11 on page 42). This
configuration is used in high-availability environments such as
High-Availability Cluster Multi-Processing (HACMP
™
) from IBM and Systems
Management Server and Clustered Server Environments from Microsoft.
Multi-initiator configurations are only supported 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 (see example
4
in
Figure 11 on page 42) requires that you add control paths. It is used by
Backup, Recovery, and Media Services.
Your library configuration is not limited to the examples shown in Figure 11 on
page 42. Many configurations are possible, and you can design them according to
your business needs.
Chapter 1. Introduction
41