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тАО12-09-2002 10:36 AM
тАО12-09-2002 10:36 AM
DLT rewind problems
Q: Is there anything that can be done to prevent this behaviour? Can DLT drive be configured to not rewind itself, anything in HPUX that can be made? I have already configured EMS to not poll the drive.
Regards,
Henrik
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тАО12-09-2002 12:15 PM
тАО12-09-2002 12:15 PM
Re: DLT rewind problems
I am not sure about NetBackup but as you describe the problem I assume NetBackup uses norewinding device files, (for example /dev/rmt/0mn). The first thing to check is that nothing is wrong with the device file.
I don't think it is possible to change the drive behavior at SCSI reset.
What is the problem if the tape is rewinded ?
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тАО12-09-2002 01:03 PM
тАО12-09-2002 01:03 PM
Re: DLT rewind problems
These are general errors that you could receive, when there is a SCSI reset or timeout.
Do you have more than one DLT 7000 on a single chain?
If so, this could be your problem. DLT7000 and DLT8000 should never be shared on the same SCSI chain.
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тАО12-09-2002 11:01 PM
тАО12-09-2002 11:01 PM
Re: DLT rewind problems
Michael is right, if you have "several" DLT7000s connected to a single L2000, most probably you have 2 or more drives sharing a SCSI chain. If so, then this can cause a SCSI reset, especially if the drives on the same chain are working at the same time.
SCSI resets can also occur when you have a faulty cable or terminator. Check those as well (bent pins, overall quality of the cable etc.)
Mechanical damage on your tape drive might also result in a SCSI reset.
HTH,
Vince
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тАО12-11-2002 05:46 AM
тАО12-11-2002 05:46 AM
Re: DLT rewind problems
Q again, does anyone know if it's possible to change the behaviour of the DLT drive to not rewind upon a SCSI reset?
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тАО12-15-2002 07:24 AM
тАО12-15-2002 07:24 AM
Re: DLT rewind problems
In some cases unexpected rewinds are also caused by application conflicts. This is very common in SAN environments, where multiple hosts have access to a common tape drive. For example, if any application on unix (e.g. make_net_recovery or diskinfo on a tape device file), accesses a device file with the rewind-on-close bit set.
If this is not in a SAN, then I would suggest looking at the logtool output and also viewing the drive's last N events log to see what errors are logged (if any) in the drive. The latter can be done using HP Library & Tape tools on UX or Windows (see www.hp.com/support/tapetools).
I can help you interpret any errors in the drive logs.
Regarding bus problems, ensure that the cable lengths are in-spec, terminators are good, thumbscrews are tight, etc.
Does the problem just happen on one DLT7000 drive, or on more them one?
Lastly, what version of firmware are you using? The DLT7000 standalone drive from HP is on V101.