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 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 control paths for System i, iSeries, and AS/400
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This section describes using multiple control paths for System i® and iSeries® servers.
The use of control paths for the System i, iSeries, and AS/400® servers is unique. In
general, every 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:
•
For a High Voltage Differential (HVD) 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.
•
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 IOP-based adapter,
and one of the drives must have a control path.
•
For the Fibre-Channel-attached drives, OS/400® V5R1 supports only one drive per
IOP-based adapter and every drive requires a control path.
•
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.
•
For V6R1 and Power 6 hardware using the IOP-less (Smart IOA), the adapter has
two Fibre Channel ports and supports multiple devices per port. At least one control
path is required per IOA and per set of drives within a library partition.
•
For V7R1 and Power 6 or Power 7 hardware using the IOP-less (Smart IOA), the
adapter has two Fibre Channel ports and supports multiple devices per port. At least
one control path is required per IOA port and per set of drives within a library partition.
Parent topic:
Using multiple control paths for control path failover
