User's Manual

Configuring and Operating the DLT2700 Mini-Library
DLT2000/DLT2500/DLT2700 Cartridge Tape Subsystem 5-7
5.4.2 Automatic Mode
This is the default or normal mode of the DLT2700 subsystem. This mode allows the
DLT2700 to load and unload cartridges as needed during backup procedures.
When the user engages the Automatic Mode a SCSI ‘unload’ command is issued, not
only is the currently loaded cartridge unloaded from the drive and restored to its
position in the magazine, the next higher-numbered cartridge is loaded into the drive.
A SCSI ‘load’ command is unnecessary, except to load the lowest-number cartridge
upon inserting the magazine.
When you copy data to the tape, operations stop if one of the following happens:
• Storage capacity of the last tape cartridge is exceeded
• No tape cartridge is in the next sequential slot in the magazine
To lock the DLT2700 subsystem into its normal operating position in the enclosure, but
leave the receiver unlocked, set the Mode Select key to Automatic mode.
The following results of setting the Mode Select key to Automatic mode are:
•= The OCP pushbuttons are enabled.
•= SCSI media changer commands are enabled.
•= Cartridge are sequentially loaded by the SCSI ‘unload’ command, but the lowest-
numbered cartridge is not automatically loaded upon magazine insertion. Behavior
in this mode is modified by the EEPROM parameters ENALDRAUTOLD (1) and
DISLDRAUTOLDMC (0), which enable both sequential and random-access
functionality.
5.4.3 Manual Mode
Automatic loading and unloading of cartridges does not occur in this mode. You must
press the Load/Unload button to move each cartridge. This mode is most useful for, but
not restricted to, copying specific files to or from tape. Basically, only the OCP
pusbuttons are enabled, as SCSI commands are disabled.
To lock the DLT2700 subsystem into the enclosure, set the Mode Select key to Manual
mode.
The following results of setting the Mode Select key to Manual mode are:
•= The receiver is unlocked and can be opened.
•= SCSI move media commands are disabled
•= SCSI load/unload commands are disabled.