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Using Special Features in Libraries 43
Using Special Features in
Libraries
Get Drive Status Enhancements
Cartridge Present Indicator
The position and meaning of the Cartridge Present indicator have changed
from ACI 4.0 to ACI 4.1. The old Cartridge Present indicator still exists in bit 0
of byte 0 of the Get Drive Status RDATA and it still functions the same as in
ACI 4.0, but the bit has been renamed to Ready Load. There is a new
indicator in bit 6 of byte 0, which is called Cartridge Present. This takes
advantage of a new cartridge present sensor added to the tape drive
mechanism. The new Cartridge Present indicator becomes active when the
tape drive detects the trailing edge of a cartridge within 50 mm of the front
panel (that is within 55 mm of the front of the tape drive chassis).
Cartridge Type Field
When the tape drive contains a cartridge, this field indicates the type of
cartridge present.
CDB Waiting Indicator
When active, this flag indicates that the tape drive has received a CDB on a
Surrogate SCSI LUN. The automation controller can retrieve the CDB using the
Get SCSI CDB command. The tape drive will not activate this flag unless the
automation controller has configured the tape drive for Surrogate SCSI
operation.
TapeAlert Indicator
When active, this flag indicates that one or more TapeAlert flags have
changed state. The automation controller can retrieve the TapeAlert flags
using a SCSI
LOG SENSE
command with page code of 2Eh encapsulated
within a Send SCSI command.
Support for Write/Read Attributes for MAM (Media Auxiliary
Memory)
An automation controller may access the MAM of a cartridge by
encapsulating a SCSI
READ ATTRIBUTE
or
WRITE ATTRIBUTE
command inside of
an ACI Send SCSI command. An automation controller has the same MAM
access rights as a host.
When loading a cartridge solely to gain MAM access, we recommend that
the automation controller turn off the auto-thread configuration and, if using
the ACI Load command, leave the Thread bit off. This configuration will