IBM 7226 Manual page 197

The drive must be in maintenance mode to run drive diagnostics or maintenance functions. To place the unit in maintenance
mode:
1. Make sure that no cartridge is in the drive.
2. Press the Unload Button 3 times within 2 seconds. A 0 appears in the Single-character Display (SCD), and the Fault LED
turns amber.
Note: If a cartridge is in the tape drive, it will eject the first time that you press the Unload Button and the drive will not be
placed in maintenance mode. To continue placing the drive in maintenance mode, perform the preceding step. While in
Maintenance Mode, the drive will not accept a cartridge unless the drive requests it. The SCD will display a flashing C to
indicate a cartridge needs to be inserted.
Maintenance functions cannot be performed concurrently with read or write operations. While in maintenance mode, the drive
does not receive commands from the server.
Exiting Maintenance Mode
The drive must be in maintenance mode to run drive diagnostics or maintenance functions. To exit maintenance mode:
1. Press the Unload Button once per second until 0 displays. Press and hold the Unload Button for 3 or more seconds; then
release the button to take the drive out of maintenance mode. If no error is detected, 0 temporarily appears in the SCD,
then goes blank. The drive then exits maintenance mode and the Status LED will return to Green.
2. If an error is detected, the SCD shows an error code but still exits maintenance mode. To determine the error, locate the
code in Error Codes and
Note: The drive also exits maintenance mode automatically after it completes a maintenance function or after 10 minutes if no
action has occurred.
Function Code 0: Maintenance Mode
Function Code 0 makes the drive available for running drive diagnostics or maintenance functions (see
Mode and Exiting Maintenance
The drive exits Maintenance Mode automatically after it completes a maintenance function or after 10 minutes if no action has
occurred.
Function Code 1: Run Drive Diagnostics
Function Code 1 runs tests that determine whether the drive can properly load and unload cartridges and read and write data.
This test runs 10 loops with each loop taking approximately 20 minutes to complete.
Once you begin this test, the diagnostics begin the loop sequence. Time the first loop by pressing the Unload Button once to
stop the diagnostics after the completion of the first loop, then record the time it takes for the test to complete. Compare the
recorded time with the Approximate Run Time above. If the test runs successfully but the execution time is significantly longer
than the Approximate Run Time, run
media and exit maintenance mode.
Attention: For this test, insert only a scratch (blank) data cartridge or a cartridge that may be overwritten. During the test, the
drive overwrites the data on the cartridge.
Note: If you inserted an invalid tape cartridge (Gen1 or WORM media, for example), error code 7 appears in the SCD. If you
inserted a write-protected cartridge, or the media has read-only compatibility (Gen2 media, for example), error code P appears
in the SCD. In either case, the tape drive unloads the cartridge and exits Maintenance Mode after the cartridge is removed.
Steps to Execute Run Drive Diagnostics:
1. Place the drive in Maintenance Mode. For instructions, see
186 IBM 7226 Model 1U3 Storage Device Enclosure
Messages. To clear the error, turn the power off, then on again.
Mode).
Function Code F: Write Performance Test. If the Write Performance Test fails, replace the
Entering Maintenance Mode.
Entering Maintenance