HP Q153090901 Abort handling

•A UNIT ATTENTION condition is set, based on the type of reset

The drive will respond to INQUIRY, TEST UNIT READY, REPORT LUNS and REQUEST SENSE within

250 ms of the reset line being released. The first command from any initiator (other than INQUIRY, REQUEST SENSE and REPORT LUNS) will result in CHECK CONDITION status with UNIT ATTENTION sense data for the reset. Note that all commands will receive BUSY status until the drive has completed its internal reset.

The Reset button on the front panel and the ACI_RESET_L line on the Automation Controller Interface are both connected to the Power-Up Reset interrupt on the processor. The effect is equivalent to power-cycling the drive. The contents of the tape and cartridge memory may not be consistent after the action and any data in the drive buffer will be lost.

Abort handling

If an abort condition is detected before a command phase completes, the bus is set to bus free and the command is not executed.

If an abort condition is detected between the end of the command phase and the start of the status phase, the bus is set to bus free and the processing below is carried out.

If an abort condition is detected during status phase, the bus is set to bus free.

If a command (other than INQUIRY for standard data or REQUEST SENSE) is received after the abort but before the drive is ready to process the command, the behavior depends on whether Disconnects are allowed.

•If disconnects are allowed, the drive will disconnect and wait until the abort processing has completed before executing the command.

•If disconnects are not allowed, a BUSY response will be returned.

	Command	Abort Processing
	ERASE	Long erase is aborted as quickly as possible without corrupting the tape
		format. Short erase completes.
	INQUIRY	None
	LOAD/UNLOAD	Load completes and logically positions the tape at BOT.
		Unload is aborted leaving the logical position at BOT unless the operation
		is past the “point of no return” in which case the tape is ejected.
	LOCATE	The logical position is set back to that at the start of the operation.
	LOG SELECT	If data transfer is complete, the command is completed, otherwise no action
		is taken
	LOG SENSE	None
	MODE SELECT	If data transfer is complete, the command is completed, otherwise no action
		is taken.
	MODE SENSE	None
14 Interface Implementation