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dd, potential bug when writing to tape drive?
From: |
Jason Foat |
Subject: |
dd, potential bug when writing to tape drive? |
Date: |
20 May 2002 17:03:22 -0700 |
Hi,
I think I've found a bug in dd, or at the very least
I'm having trouble using it to write to my tape drive.
In particular, I'm attempting to use a combination of ssh/dump/dd
to back up remote systems to a tape drive on my local linuxbox.
I'm using dd 4.1 with Linux 7.2, on an i686 architecture. For example,
#ssh LINUXBOX /sbin/dump -0 -f - /dev/sda2 | dd of=/dev/nst0
yields the following sequence:
DUMP: Date of this level 0 dump: Thu May 16 21:03:40 2002
DUMP: Dumping /dev/sda2 (/) to standard output
DUMP: Exclude ext3 journal inode 8
DUMP: Label: /
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 10472849 tape blocks.
DUMP: Volume 1 started with block 1 at: Thu May 16 21:03:53 2002
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: 2.40% done at 837 kB/s, finished in 3:23
DUMP: 4.84% done at 844 kB/s, finished in 3:16
DUMP: 7.24% done at 842 kB/s, finished in 3:12
DUMP: 9.64% done at 841 kB/s, finished in 3:07
DUMP: 12.03% done at 839 kB/s, finished in 3:02
DUMP: 14.41% done at 838 kB/s, finished in 2:58
dd: writing `/dev/nst0': Invalid argument
3156720+41 records in
3156740+0 records out
Note the 'Invalid argument' error that comes up 15% of
the way through the dump.
I can also generate a similar error by attempting to
write a simple file to the tape:
# echo `date` | dd of=/dev/nst0
yields
dd: writing `/dev/nst0': Invalid argument
0+1 records in
0+0 records out
For a truley bizaare twist to this, if I issue a simliar
dump command to a SOLARISBOX, the dump completes just fine.
Is this a bug, or am I doing something wrong?
Thanks,
Jason Foat
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