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error -102

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First, what I'm using:


hardware: Overland, DLT1


tapes: Sony DLTtapeIV


software: Retro Workgroup for Windows NT




When trying to retreive a file from a particular DLT tape, a folder is created in the destination location, the interface indicates that Retrospect is "Locating" the file and I can tell that it is communicating with the drive. But after several minutes, I get "error -102 trouble communicating". But it only does it with this DLT tape, I tried other tapes and they worked fine.




Please help





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If all other tapes work fine under any other conditions except this one tape, then it sounds like you have a bad tape.




Error 102 trouble communicating




This error occurs when the CPU loses contact with the backup device. The most common cause is improper SCSI termination. But it can also be caused by other issues on the bus. It is necessary to go through the SCSI troubleshooting outline below.




If a new tape works, then the tape you are seeing the error with is bad. If


you see the error on all tapes, you can look into the following possibilities:




1) a dirty tape drive. Clean the drive with a cleaning cartridge. Most manufacturers recommend cleaning the unit once for every 8-10 hours of run time. Once a week is often enough for most people.




2) another device on your SCSI bus may be interfering with the tape drive's communication. Turn off your computer and the SCSI devices. Make sure your SCSI ID numbers don't conflict. Disconnect all SCSI devices except for the tape drive.




3) you have a bad cable. Replace the SCSI cable that connects the tape drive to the computer after removing other devices and cables from the SCSI chain.




4) you are missing a terminator or have a bad terminator. The last device and ONLY the last device in your SCSI chain needs to be terminated. Try replacing the terminator if you already have one on the chain.




5) the computer may be having a problem. Install Retrospect on another computer and try the tape drive there as the lone SCSI device.




6) the drive may be defective. If you have implemented all of the preceding steps and get failures on multiple tapes after changing cables, terminators and computers, then the drive, being the only factor that has not changed, is the culprit--send it back to your vendor for repairs.




In the event that your tape is bad, you can determine what was on that tape by clicking on Configure:Backup Sets, selecting the Backup Set to which it belongs and marking all tapes other than the damaged tape "missing." Then go through the motions of a search and retrieval (Immediate:Restore:Search) and click on searching when you have selected the Backup Set and a destination drive. Make sure you're searching for "file name contains


(BLANK)," and let the search proceed. Click on files chosen. Files with black diamonds next to their names are on the other tapes. The damaged tape's files will not show black diamonds.




Transferring files from a bad tape is another matter. If there is a bad spot on the tape (a manufacturing defect or a spot damaged by human error), a tape to tape or tape to hard drive transfer will not work. You can transfer the data up to the bad spot, but due to the linear nature of tape, you will not be able to proceed any further.



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