IBM System Storage TS3500, Введение и руководство по планированию

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Application 1 (about Department A) in Logical Library 1, commands from
Application 2 (about Department B) in Logical Library 2, and commands from
Application 3 (about Department C) in Logical Library 3. In this configuration, the
storage slots and drives in each logical library are dedicated to that library and are
not shared among other libraries. Commands issued by the applications travel to
the library through three unique control paths. Thus, the data processing for
Department A is confined to the storage slots and drives in Logical Library 1,
processing for Department B is confined to the storage slots and drives in Logical
Library 2, and so forth.
Using multiple logical libraries for mixed drive types
For applications that do not support mixed drive types and media in the same
logical library, the TS3500 Tape Library can use partitioning and multiple logical
libraries to keep them separate. For example, you can partition Ultrium 5, Ultrium
4, Ultrium 3, Ultrium 2, and Ultrium 1 tape drives and their media into multiple
and separate logical libraries.
Using multiple control paths
With the TS3500 Tape Library, in addition to creating multiple logical libraries, you
can also configure any logical library to have more than one control path. When
you configure additional control paths, additional library sharing configurations
and availability options are made possible. Access to the logical library is on a
first-come, first-served basis and each control path for a logical library can accept
commands while the library is in use by another control path.
Note:
Microsoft Windows 2000 Removable Storage Manager (RSM) does not
support multiple control paths within a logical library. IBM recommends that you
disable RSM to use this feature.
To add or remove additional control paths, see the IBM System Storage TS3500 Tape
Library with ALMS Operator Guide .
The sections that follow describe two potential uses for multiple control paths.
Using multiple control paths for IBM i attachment
The use of control paths for IBM Power Systems
™
running IBM i and the System
i
®
, iSeries
®
, and AS/400
®
servers is unique. In general, every IBM i, System i, and
iSeries input/output processor (IOP)-based adapter must “see” the control path
that is associated with the drives to which it is connected. The following list
presents possible scenarios:
v
For a high voltage differential (HVD) small computer system interface (SCSI)
Ultrium 1 tape drive, IBM supports single drive configurations so that every
HVD Ultrium 1 tape drive must have a control path when connected to the
System i or iSeries server.
v
For HVD and low voltage differential (LVD) SCSI Ultrium 2 tape drives, the
System i or iSeries server supports multiple drives that are connected per the
IOP-based adapter. One of the drives must have a control path.
v For the Fibre Channel-attached drives, OS/400
®
V5R1 supports only one drive
per IOP-based adapter and every drive requires a control path.
v
For an OS/400 V5R2 and later Fibre Channel connection, the IOP-based adapter
supports multiple drives per adapter, so that only one control path for the group
of drives is required.
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IBM System Storage TS3500 Tape Library with ALMS: Introduction and Planning Guide