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Tandberg Data Troubleshooting
Tandberg LTO HH Installation and User Manual 31
6.6.9 Cleaning LED Is ON
The Cleaning LED will go ON 100 hours after the last cleaning operation or after an unrecoverable
read or write error. Unrecoverable read or write errors may have been caused by debris on the
read/write head. If the Cleaning LED was switched ON by the 100 hours function, the drive will
function as normal with the Cleaning LED is on. Cleaning is always recommended when the Cleaning
LED is ON.
1. Run cleaning operation with cleaning tape.
The Cleaning LED indicates that the drive needs cleaning due to elapse of 100 hours since last
cleaning or a hard Write /Read error occurred that may be caused by debris on the head(s).
2. If the Cleaning LED is still On after running the cleaning operation, check for expired cleaning
tape.
A cleaning tape can be used 50 times. If an expired cleaning tape is used, the drive ejects the
cleaning tape and the Cleaning LED stays lit.
6.6.10 Incorrect Data Compression
1. Check if data is already compressed
Data may have been compressed by software in the host computer.
In some cases data will actually expand when subjected to the compression. This may for
instance be the case when sending already compressed data to the drive and the compression
option is enabled. In this case the drive automatically turns compression on and off to optimize
the data storage.
Important: Tandberg LTO HH has compression ON by default. The compression can be turned
OFF by using the SCSI Mode Select command.
2. Turn OFF any software compression in use.
The compression is done in the Tandberg 200LTO, LTO-2 HH`s hardware. Therefore any other
compression software in the host or on the host bus adapter should be turned off.
The data is compressed using the SLDC (Streaming Lossless Data Compression) algorithm that is
based on ALDC (Adaptive Lossless Data Compression). The SLDC format is defined in the
ECMA-321 standard. Two enhancements are introduced:
• Uses two methods to reduce expansion of uncompressible data.
• Uses embedded code words.
6.6.11 Slow Performance
1. Check that the software driver used for the Tandberg LTO HH is the latest version.
Running without or with wrong software driver can cause the drive to run with low performance
due to wrong block size and buffer usage.
2. Clean the tape drive.
3. Perform a Drive Diagnostics test (
see Section 6.4).
6.6.12 Intermittent Failures
If the drive fails intermittently:
1. Clean the tape drive.
2. Check the SCSI termination on the SCSI Bus.
3. Check the operating system logs for any errors.