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Repositioning Scsi Tapes

By jp-mattenet ·
Hi,
We are traying to do incremental backups using dump, on a scsi tape unit from HP. The problem is that is always rewinding the tape to the begining, no mater what we do to position the tape before.
Any Ideas?


Thanks,
JP

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Repositioning Scsi Tapes

by Hasse MCSE/Brainbench In reply to Repositioning Scsi Tapes

Hi!

I think this is a problem with your backup software and not the tape backup itself.

You didn't day what software you use for backups.

/Hasse

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Repositioning Scsi Tapes

by jp-mattenet In reply to Repositioning Scsi Tapes

Hasse,
We are using the dump command, but we also tried with cpio and tar with the same results. It is possible as you say that there is a problem with the software, but I'm sure there should be a way arround. Some unix (Sinix?) have different devices to specify no_rewind..

Regards,
JP

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Repositioning Scsi Tapes

by andries_burger In reply to Repositioning Scsi Tapes

JP,

Whether you can position the SCSI tape to a preset position would depend on the device driver you are using. Under SINIX, later known as Reliant UNIX, there were specific device files, prefixed with 'n'. Using these devices allowed one to usethe 'mt' utility to forward a tape to a specific tape block, and then since you specified the no_rewind tape device, the device stays put, allowing any other software to start writing at that specific position. You will have to see if your device has installed a no_rewind device option. Which version of Linux are you using?

Let me know the answer on the no_rewind device question. Maybe there is away around it. Will check my Mandrake system for more information.

Best,
Andries

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Repositioning Scsi Tapes

by jp-mattenet In reply to Repositioning Scsi Tapes

Andries,
Yes, RedHat 6.2 has such devices, and mt work as expected.
Thanks,
JP

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Repositioning Scsi Tapes

by jp-mattenet In reply to Repositioning Scsi Tapes

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