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Sense data
When a drive encounters an error, it provides sense data as a response to the host.
Refer to the IBM TS4300 Tape Library SCSI Reference for library sense data information. Refer to the IBM
LTO Ultrium Tape Drive SCSI Reference for tape drive sense data information.
In addition, you can use the IBM Tape Diagnostic Tool (ITDT) to further examine data and determine
errors. See "IBM Tape Diagnostic tool (ITDT)" on page 112.
Drive Error Codes: Single-character display (SCD)
SCD drive error codes give descriptions of the errors and messages that pertain to the drive.
If you encounter problems while the tape drive is running, refer to Chapter 5, "Troubleshooting," on page
91.
The SCD display appears on the inside back of an installed library and can be seen through the front
window of an expansion unit. It is seen on the lower center of a full-height drive. Each drive has a status
light and single-character display, that when visible provides drive informational and error conditions. The
single-character display shows either a single character, a dot (in the lower right of the display), or both.
Note: The SCD can be seen through the windows of expansion units, and for full-height drives only. If you
have a base unit without expansion units, or if you have half-height drives, the SCD cannot be seen.
"Single-character display (SCD) codes" on page 145 lists the codes for error conditions and informational
messages. If multiple errors occur, the code with the highest priority (represented by the lowest number)
displays first. When the error is corrected, the code with the next highest priority displays until no errors
remain.
The SCD is blank during normal operation.
Single-character display (SCD) codes
Table 49 on page 145 gives descriptions of the errors and messages that pertain to the drive. For
troubleshooting tips, see "Troubleshooting Guide" on page 103.
• Make note of the SCD error code before a cartridge is removed or the SCD error code is cleared.
• If an error occurred with a cartridge in the drive, eject the cartridge from the drive with the library
Management GUI (see "Locating Management functions" on page 79).
Attention: If the drive detects a permanent error and displays an error code other than SCD
automatically runs a drive dump. If you force a drive dump, the existing dump is overwritten and
data can be lost. After you force a drive dump, do not turn OFF the power to the drive or you might
lose the dump data.
Table 49. Error codes on the single-character display
Error code
No error occurred and no action is required. This code displays when diagnostics finish
running and no error occurred.
Note: The single-character display is blank during normal operation of the tape drive.
Temperature problem. The tape drive detected that the recommended operating
temperature was exceeded.
Power problem. The tape drive detected that the externally supplied power is outside
the specified voltage limits (the tape drive is not operating).
Firmware problem. The tape drive determined that a firmware error occurred
Note: Do not force a new dump; the tape drive already created one.
Meaning
Chapter 5. Troubleshooting 145
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Troubleshooting
