HP LTO 4 SAS, LTO 4 FC Backup software, Resetting drives, Resetting via the ACI Reset command

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”

50 Supporting Ultrium features

HP restricted