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9840 Troubleshooting and Recovery
Forcing a Diagnostic Dump (Reset Drive)
This is a RESET operation. It works the same as an initial program load (IPL), but also
forces a diagnostic dump of the present state of the machine. A forced diagnostic
dump is usually done in response to an Engineering request to identify drive status at
any time during drive operation.
Forcing a diagnostic dump resets the drive and writes the dump to the EEPROM. The
EEPROM can accumulate approximately 12 dumps, depending on compression.
Dumps remain in the EEPROM until it is full. If EEPROM lacks sufficient space for an
additional dump, all previous dumps are erased and only the newest dump remains in
the EEPROM.
Note. New dumps are appended to earlier dumps already on the tape.
To force an immediate diagnostic dump from the operator panel to the EEPROM:
1. Press the Menu and Unload switches for one second to dump present drive status
from memory to EEPROM. Dump data collection begins when "CHK FFFF" is
displayed and the Power indicator begins to flash.
2. Observe the Service indicator. When the dump data collection is complete, the
Service indicator flashes.
3. The drive automatically performs an IPL and returns to online: The display
alternates between the corporate ID and FFFF:DmpYY until any normal drive
activity is started.
Writing the Diagnostic Dump Tape to File
The dump data on a dump tape can be accessed and read as data. To do so, write-
protect the dump tape and load it into a drive. The drive recognizes the dump tape, but
because it is write protected, does not go into automatic diagnostic dump operation.
Instead, it waits for a read command from the host.
To copy the EEPROM dump data to tape:
1. Take the drive to offline.
2. Remove any tape cartridge from the drive.
3. Insert a write-enabled dump tape in a drive: Data is automatically written to the
tape from the drive EEPROM. While data is copied to the tape, the Activity
indicator flashes. When the copy is done, the tape ejects.
Note. If the tape is file-protected, operation will not take place and the tape will not eject.
Note. If "DmpWrFailx" displays (where x = 1 or 2), refer to
Messages,
on page 2-7 for instructions on how to handle this error condition.
4. When finished, return the drive to online, or replace as necessary.
9840 Tape Drive Operations Guide— 429596-002
A- 4
Forcing a Diagnostic Dump (Reset Drive)
Table 2-4, Operator Panel
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