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Date:      Fri, 7 Aug 1998 22:07:20 -0700
From:      Jeff Kletsky <Jeff@Wagsky.com>
To:        freebsd-questions@FreeBSD.ORG
Subject:   multi-session dump on single tape
Message-ID:  <l03110701b1f189096690@[192.168.6.3]>

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I am running 2.2.6-STABLE and have an Archive Python DAT drive:

ahc0 <Adaptec aic7850 SCSI host adapter> rev 1 int a irq 11 on pci0:13:0
ahc0: aic7850 Single Channel, SCSI Id=7, 3 SCBs
ahc0: Host Adapter Bios disabled.  Using default SCSI device parameters
ahc0 waiting for scsi devices to settle
(ahc0:5:0): "ARCHIVE Python 25501-XXX 5.45" type 1 removable SCSI 2
st0(ahc0:5:0): Sequential-Access density code 0x13, 512-byte blocks,
write-enabled

which seems to work fine for tar and a single dump, but I have not been
able to determine the "magic" required to place multiple dump sessions on a
single tape.

I have tried the following, then using restore -t, restore -t -s 1, restore
-t -s 2, with mt rewind and mt fsf thrown in liberally and in various
combinations to see if the dump is there.

mt erase
dump -0au /

works,
but any of the following seem to leave only a single session on the tape

mt erase
dump -0au /
dump -0au /var

mt erase
dump -0au /
mt weof
dump -0au /var
mt weof

mt erase
dump -0au /
mt eod
mt weof
dump -0au /var
mt eod
mt weof

The drive is known to be working as expected by Dantz Retrospect (Mac) and
NT Backup, as well as tar (though I don't recall trying multiple sessions
before).

Any suggestions would be most welcome.  With 3.0 coming down the pipe, I'd
like to have a *real* backup instead of tar...

Jeff Kletsky







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