5190/5194 Modular Tape Subsystem Manual

Operating the Cartridge Tape Drive and ACL
5190/5194 Modular Tape Subsystem Manual—426878-002
4-23
Controls on the Drive Front Panel
Operator Buttons
The drive front panel has five operator buttons: SHIFT, TEST, START, UNLOAD, and
RESET. These buttons let you load cartridges, unload cartridges, and rewind tape.
Confirmation messages appear on the message panel after you press a button.
Table 4-4 on page 4-9 shows common operations performed with these buttons.
Specific operations are described later in this section.
Message Panel
The message panel on the drive front panel can display up to eight alphanumeric
characters or symbols. These combine to form status messages. For examples of
status messages, see Understanding Operator Messages on page 4-28.
Status Indicator LEDs
Three LEDs located to the left of the message panel (ATTN, SEL, and COMP) indicate
operating conditions. Table 4-6 summarizes their functions.
For more information on compression and the COMP (compression) LED, see
Controlling Data Compression (5190 Tape Drive) on page 4-44.
Tape Position LEDs
Seven amber LEDs form a horizontal line at the top of the tape drive front panel and
indicate the tape position. The BOT (beginning-of-tape) LED lights when the tape is
completely rewound. As tape moves through the drive, neighboring LEDs to the right
light sequentially to indicate the tape position. For a 5190 tape drive, all seven LEDs
are lit when the drive senses the end-of-tape (EOT) position.
When all seven LEDs are lit on a 5194 tape drive, the tape is near the end of the reel.
At this point, the 5194 tape drive reverses and continues writing 18-track data back to
the physical beginning of the tape. When the 5194 tape drive is at EOT, the tape is
Note. Normal operation does not require use of the SHIFT and TEST operator buttons, which
are reserved for factory diagnostics. You can perform operator diagnostics using TMDS,
COUP, PUP, or SCF commands; see Starting and Testing the Tape Drives (NonStop Himalaya
K-Series Servers) on page 3-45 or Starting and Testing the Tape Drives (NonStop Himalaya
S-Series Servers) on page 3-46.
Table 4-6. 5190 and 5194 Tape Drive CRU Front-Panel Status Indicator LEDs
LED Function
ATTN (Attention) Not used (always unlit)
SEL (Selected) Flashes on and off when the drive formatter is polling the drive
COMP (Compression) Lights when the drive reads or writes compressed data