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Sony DDS4 hangs

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I'm having trouble with my Sony SDT 11000 DDS 4 drive. The drive backs up fine but then hangs during verification (Retro shows no progress, busy light blinks on dds4, mac is crashed - cursor/mouse moves but there is no functionality. Must force restart). It also hangs if I do a test restore, so I don't know if I actually have a valid backup. I thought this might be due to a bad scsi cable, but I bought a new one (plus a new (active) terminator) and they didn't help. I first had this problem while using Retro Desktop 4.2 with the ADK. Dantz told me to upgrade to 5.0, which I did. No change.






Mac G3 B&W, OS 9.2.2


ATTO EPCI Dual channel UW scsi adaptor, firmware 1.6.6


Retrospect 5


Sony SDT 11000 at end of scsi chain (after 2 removeable seagate cheetah drives in a kingston rack enclosure)




This hardware worked together flawlessly for 6 or 8 months prior to this. I haven't had any problems with the seagate drives. Just the DDS 4.




Any Ideas???









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If the mouse moves, but the Mac is hung up, it's most likely that your SCSI bus is hung, and you have a SCSI problem. If the mouse doesn't move, that means that the Mac's processor is hung, and you should look at System Software and extensions. More often than not, you will find that the mouse moves and you can force quit the program (at which point the Mac may or may not completely crash).




A SCSI hang can be caused by one or more of the following:


1) a dirty tape drive or bad tape. Try another tape. If other tapes work, then you just have a tape with a spot that's bad enough to crash your backup.




2) another device on your SCSI bus is interfering with the tape drive's communication. Make sure your SCSI ID numbers are set correctly. Turn off your Mac and the SCSI devices. 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 Macintosh 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.




The steps above are the essential outline of our SCSI troubleshooting here at Dantz. Hands on testing of device issues is really still the best method and even getting SCSI logging information is usually only to confirm empirical testing. Note that concluding something is a bad device is the LAST thing we assume after all other components and variables have been ruled out.




"SCSI voodoo", as they call the nebulous symptoms that can plague a SCSI bus, can often lead one to false assumptions of the cause of problems. It's important that once a variable is tested that it be tested more than once for consistency's sake to rule out dumb luck. For example, SCSI voodoo accounts for why a tape drive may work fine for many months without proper termination but then suddenly fail in some way later. Although customers will often cite that nothing has changed with their SCSI bus configuration in months and that it was all working before, this is really a hallmark inconsistency of SCSI voodoo.




The quickest and most conclusive test for most devices is to test it on more than one computer as the only device on the bus and with a different SCSI cable. If the problems can be reproduced on multiple computers, it's more than likely a hardware problem with the device itself.




Of course there a myriad of other specific issues having to do with a device's own hardware settings like with internal jumper cables, dip switches or internal termination that has to be sorted out with the device's manual and/or vendor or manufacturer of the drive but the kernel of SCSI troubleshooting above is a good general guideline.



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