IBM B-Series, Maintenance Information

Page: 129 / 648

Library Configurations
Models B02, B12 and B22 may operate in Base Configuration or Split Configuration as selected in the
operator menus. Models B01, B11 and B21 do not support Split Configuration.
AS/400 Notes:
1. If attached to an AS/400 system, when switching between Base and Split configuration, the I/O
processor must be reloaded. To reload the I/O processor, vary off and on with reset, or use STRSST
to IPL the I/O processor.
2. If the Magstar MP Model B02, B12 or B22 is in Split Configuration, microcode update is not supported
using the PTF process. The service representative must update the Magstar MP using an FMR tape
according to the instructions in the maintenance information manual.
Base Configuration
In a Base Configuration, all magazine cells are accessible to all hosts (initiators) on the bus. The library
mode of operation is selected at the operator panel for drive 1 only, but it applies to the entire library. For
dual drive libraries on a single host the drives must have unique addresses. Multiple host attachments
may have unipue or identical addresses.
Random Mode - Base Configuration:
See “Random Mode” on page LIBRARY-5 for an
overview of this mode. Magstar MP acts as a self-contained library of up to 19 cartridges with additional
access to a 20th cartridge through the priority cell. In models with 2 drives, the source and destination
elements of a move can indicate either drive. (Both drives can be used.) See “SCSI Medium Changer
Addressing for Base and Split Configurations” on page LIBRARY-8.
Automatic Mode - Base Configuration:
See “Automatic (Sequential) Mode” on
page LIBRARY-6 for an overview of this mode. In models with 2 drives, only drive 1 is used for this mode.
Drive 2 is unused. The library processes all cartridges that are in import positions sequentially, beginning
at the rightmost priority cell position, then proceeding from right to left across both magazines as viewed
from the library front.
Manual Mode - Base Configuration:
See “Manual (Sequential) Mode” on page LIBRARY-6 for
an overview of this mode. In models with 2 drives, only drive 1 is used for this mode. Drive 2 is unused.
The library processes all cartridges that are in import positions sequentially, beginning at the rightmost
priority cell position, then proceeding from right to left across both magazines as viewed from the library
front.
Split Configuration
It is advantageous to be able to share a single library between host systems. Unfortunately, some
applications (and some systems) do not allow for sharing devices between systems. Split Configuration
allows for a single library to be used by multiple systems by having the library manage this ‘sharing’. This
is accomplished by having the library appear as two separate half-size libraries on each of two SCSI
busses. Two SCSI busses are created when the SCSI Bus Jumper is removed between the drive 1 and
drive 2 SCSI ports.
Split Configuration is created by logically dividing one physical library into two virtual libraries.
Virtual Library 1 consists of:
Drive 1,
LIBRARY
Library
LIBRARY-7