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44 Using Special Features in Libraries
minimize the length of time required to complete the load because the tape
drive will not thread the media. Typically, non-threading loads complete in
approximately one second.
Set/Get Time
The Set Time and Get Time commands provide a mechanism to synchronize
the time stamps used in the tape drive’s logs with those used in the automation
controller’s logs. Generation 1 HP Ultrium tape drives use a 32-bit time stamp
that rolls over every 19 hours. Generation 2 drives use a 48-bit time stamp
that rolls over once in approximately 140 years.
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 Reference Manual.
Configuring Autoload and ACI-Controlled Loads
HP Ultrium tape drives can be configured so that loads either occur
automatically or under the control of the ACI. A SCSI
MODE SELECT
command
can set the Autoload field to do this. The field is byte 5, bits 0–2 of the Control
Mode page, 0Ah.
If the Autoload field = 0, Autoload is set and the drive automatically loads a
cartridge when it is inserted and threads the tape so that it is ready for use.
If the Autoload field = 1 or 2, the drive pulls the cartridge into the drive but
does
not
thread the tape. In this position, the LTO-Cartridge Memory can be
read. The drive requires a Load command to thread the tape and make it
ready for use.
Cartridge Positions During Load and Unload
The following diagram shows the positions of importance during load and
unload.