Here is the output of my backup when I try to run it:
|------------------------------------------------
| Doing level 0 backup of all using dump
| Retensioning tape...
| Rewinding & erasing tape...
| Found index key 200203111033.53, next file is 3
| Deleting record for file 0
| Deleting record for file 1
| Deleting record for file 2
| Creating index key 200203111058.50
| Tape #0
| Filesystems = / /boot
|------------------------------------------------
At block 0.
|------------------------------------------------
| File number 1, index key 200203111058.50
| Backup of: /
| Date of this level 0 backup: Mon Mar 11 10:59:46 2002
| Date of last level 0 backup: the epoch
|------------------------------------------------
| (dump -0 -b 10 -a -f - / | gzip -4) | buffer -m 3m -s 10k -u 100 -t -p 75 -B \
| -o /dev/nst0
|------------------------------------------------
DUMP: Date of this level 0 dump: Mon Mar 11 10:59:46 2002
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/sda6 (/) to standard output
DUMP: Label: none
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 4788845 tape blocks.
DUMP: Volume 1 started at: Mon Mar 11 11:00:13 2002
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
buffer (writer): write of data failed: Input/output error
bytes to write=10240, bytes written=-1, total written 1060K
DUMP: Broken pipe
DUMP: The ENTIRE dump is aborted.
|------------------------------------------------
| Backup start: Mon Mar 11 10:59:46 2002
| Backup end: Mon Mar 11 11:01:47 2002
|------------------------------------------------
At block 0.
|------------------------------------------------
| File number 2, index key 200203111058.50
| Backup of: /boot
| Date of this level 0 backup: Mon Mar 11 11:01:57 2002
| Date of last level 0 backup: the epoch
|------------------------------------------------
| (dump -0 -b 10 -a -f - /boot | gzip -4) | buffer -m 3m -s 10k -u 100 -t -p \
| 75 -B -o /dev/nst0
|------------------------------------------------
DUMP: Date of this level 0 dump: Mon Mar 11 11:01:57 2002
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/sda1 (/boot) to standard output
DUMP: Label: none
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 2911 tape blocks.
DUMP: Volume 1 started at: Mon Mar 11 11:01:58 2002
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: Volume 1 completed at: Mon Mar 11 11:02:05 2002
DUMP: Volume 1 took 0:00:07
DUMP: Volume 1 transfer rate: 414 KB/s
DUMP: 2903 tape blocks (2.83MB)
DUMP: finished in 5 seconds, throughput 580 KBytes/sec
DUMP: Date of this level 0 dump: Mon Mar 11 11:01:57 2002
DUMP: Date this dump completed: Mon Mar 11 11:02:05 2002
DUMP: Average transfer rate: 414 KB/s
DUMP: DUMP IS DONE
buffer (writer): write of data failed: Input/output error
bytes to write=10240, bytes written=-1, total written 0K
|------------------------------------------------
| Backup start: Mon Mar 11 11:01:57 2002
| Backup end: Mon Mar 11 11:02:05 2002
|------------------------------------------------
At block 0.
|------------------------------------------------
| Rewinding...
|------------------------------------------------
Any ideas? As far as I know, both the tape drive and the tapes are perfectly ok (the machine used to have NT4 on it, and the backups worked perfectly there).