Operating instructions

SEPTEMBER 2005 MAGNUM 1X7 LTO AUTOLOADER
3-1
3
IMPLEMENTING SCSI
OPERATIONS
This chapter provides information about performing the following common
SCSI operations:
 Resetting the autoloader
 Setting element addresses
 Using the cartridge inventory
 Moving cartridges
 Reserving elements
 Inquiring about the status of a specific operation
 Performing diagnostic tests
 Copying microcode
For detailed information about the SCSI commands that the autoloader uses to
perform these operations, refer to Chapter 4 through Chapter 25.
3.1 DISCONNECTING FROM THE SCSI BUS
The autoloader disconnects from the SCSI bus to process a command that
requires a lengthy amount of time, thereby freeing the SCSI bus to allow
another I/O process to occur. The autoloader can disconnect from the SCSI bus
only if it has been granted permission to do so by the initiator.
While disconnected from the SCSI bus, processing a command, or trying to
reconnect to the initiator, the autoloader returns Busy status or Check
Condition status (Not Ready) to other initiators requesting commands other
than REQUEST SENSE (03h) and INQUIRY (12h). If the same initiator selects
the autoloader to request another command, the autoloader returns Check
Condition status (Overlapped Commands).