Supporting Ultrium features50
HP restricted
Resetting drives
The tape drive can be reset by the automation controller via the ACI Reset command or, in ACI
mode, by pulling the ACI_RST_L line low (see “Rear Panel and Connectors”, Chapter 7 of the
Hardware Integration Guide, Volume 1 of the HP LTO Ultrium Technical Reference Manual).
Resetting via the ACI Reset command
Two levels of reset via the Automation Interface are provided, namely ACI Reset and Drive Reset. The
former resets the Automation Interface port and all SCSI parallel/Fibre Channel ports. The latter is
equivalent to a power-on reset. Either reset method will interrupt the interface between the drive and
host, with the Drive Reset potentially resulting in no End of Data written to tape.
It is therefore strongly recommended that an ACI reset command is not sent unless all other recovery
methods have failed. Note that certain ACI commands (see Table 2 on page 43) can be queued
behind outstanding SCSI commands giving the impression that the drive has stopped responding
over the Automation Interface bus. (All command packages will be still be ack'ed even though the
command will be queued.)
A SCSI interface reset will not affect the Automation interface.
NOTE: Following an upgrade of the drive firmware via either tape or SCSI, the drive will be reset
as if it had been powered up.
The implementation details are beyond the scope of this document currently.
Resetting using the ACI_RST_L line
The behavior when the ACI-RST_L line is activated depends on whether the drive is in ACI or ADI
mode. In ACI mode activating this line will produce a power-on reset. Activating the ACI_RST_L in
ADI mode will simply logout the ADT port.
Further details
• For more information about ACI, see “Automation Control Interface (ACI)” in Chapter 1, “Ultrium
Features”, of Background to Ultrium Drives, Volume 6 of the HP Ultrium Technical Manual.
• For more details of hardware integration, see Chapter 5, “Automating Drives”, of Hardware
Integration, Volume 1 of the HP Ultrium Technical Manual.
Backup software
You need backup application software that supports your Ultrium drive and tape library. For the
latest list of appropriate backup packages, contact your tape library supplier.
Suitable backup applications include driver software that establishes the interface between the tape
drive and the software. Applications usually recognize tape drives by their manufacturers’ ID string
rather than their model number:
LTO 4 SCSI drive “HP Ultrium 4-SCSI”
