Preliminary
4-24
September 21, 1999
BENCHMARK
T A P E
S Y S T E M S
4.6.3.3 CHANGE
MODE
Your DLT7 Autoloader is capable of operating in either Random-Access or Sequential-
Access modes.
When in Random-Access mode, the DLT7 Autoloader allows software selection of
any
data
cartridge in
any
order. You can logically divide cartridge usage to satisfy particular data
storage needs. For example, you can assign one or more cartridges to specific data
functions, such as certain directories or network servers, or you can assign specific
cartridges to individual users or groups, such as Sales or Engineering.
When in Sequential-Access mode, all cartridges present are considered to be a single
volume. The DLT7 Autoloader firmware predefines the selection of the cartridges. After
initialization, the firmware always loads the first cartridge found, counting from 1 through 7,
into the drive. After the backup software has filled the first cartridge and issued an eject
command the DLT7 Autoloader automatically unloads the drive, returns the cartridge to its
storage slot, and then loads the next cartridge in order. Empty storage slots are ignored.
Your DLT7 Autoloader continues this process until it has used the last cartridge in the
sequence. It is important to note that while in Sequential-Access mode, your DLT7
Autoloader robotics are not logically connected to the SCSI bus and do not respond to SCSI
commands.
To change modes, follow these steps:
1. After entering the
DIAG MENU
, press and hold the
MODE
button until
CHG MOdE
appears on the LCD panel.
2. Press
the
SELECT
button to display the current mode.
3. Press
the
NEXT
or
PREVIOUS
button to toggle the mode between
SEQUENTIAL
and
RANdOM
.
4. Press
the
SELECT
button.
LdR REAdY
appears on the LCD panel.
When in Sequential-Access mode, your DLT7 Autoloader replaces the
LdR REAdY
message with a
SEQ REAdY
message.
If you press the
MODE
button while the DLT7 Autoloader is in Sequential-Access mode, the
STOP SEQ
menu appears on the LCD. If you press the
SELECT
button while in this menu,
the
SEQ ENdING
message replaces the
LdR REAdY
message and Sequential mode ends
after the autoloader unloads the current cartridge. Pressing the
MODE
button after the
cartridge is unloaded returns your DLT7 Autoloader to the normal menu structure.
When the
SEQ ENdING
message appears on the LCD panel, pressing the
MODE
button
before the current cartridge is unloaded displays the
RESUME SEQ
menu. Pressing the
SELECT
button while in this menu cancels the previous
STOP SEQ
request and Sequential
mode continues with the current cartridge as if you had never requested
STOP SEQ
.
When the last cartridge in the volume has been filled, the
SEQ dONE
message replaces the
SEQ REAdY
message on the LCD panel.
When the
SEQ dONE
message appears on the LCD panel, pressing the
MODE
button
displays the
START SEQ
menu. Pressing the
SELECT
button while in this menu restarts
Sequential mode. Pressing the
MODE
button while in this menu returns your DLT7
Autoloader to the normal menu structure.
