[ILUG] dumping multiple volumes to tape?

[Paul Reilly]

Hi,

I'm using dump/restore with a 40GB DLT tape. I want to backup three
volumes of 3GB,  11GB, and 5 GB. However dump defaults to assuming a tape
length of 2300 feet, and 1600 BPI (bytes/inch) ==> 27600 inches x 1600
BPI == 43 MB. So anything larger than 43 MB and it asks you to put in a
new tape! Okay, so you fool it by giving it the -s and -d options to
specify a density and tape length which would allow your volume to fit on
the tape, and away it goes. However it takes much longer than it should to
write the data to the tape. ie it just keeps running the tape until it
gets the EOT (end of tape) at the end, by which time it's too late to
dump the other two volumes on the tape!?! How can I get it to stop when
it's dumped the volume, so I can dump the next one?

Thanks,

Paul


# dump -0u -s 60000 -d 6250 -f /dev/nst0 /
  DUMP: Date of this level 0 dump: Thu Nov 23 17:18:21 2000
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/sda5 (/) to /dev/nst0
  DUMP: Label: none
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 2873545 tape blocks on 0.69 tape(s).
  DUMP: Volume 1 started at: Thu Nov 23 17:18:25 2000
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: 45.55% done, finished in 0:05
  DUMP: 92.25% done, finished in 0:00
  DUMP: Closing /dev/nst0
  DUMP: Volume 1 completed at: Thu Nov 23 17:29:42 2000
  DUMP: Volume 1 took 0:11:17
  DUMP: Volume 1 transfer rate: 4506 KB/s
  DUMP: DUMP: 3050618 tape blocks on 1 volumes(s)
  DUMP: finished in 677 seconds, throughput 4506 KBytes/sec
  DUMP: level 0 dump on Thu Nov 23 17:18:21 2000
  DUMP: DUMP: Date of this level 0 dump: Thu Nov 23 17:18:21 2000
  DUMP: DUMP: Date this dump completed:  Thu Nov 23 17:29:42 2000
  DUMP: DUMP: Average transfer rate: 4506 KB/s
  DUMP: DUMP IS DONE