USB removable drive as dump device?

Mike Loiterman mike at
Tue Jan 17 19:00:02 PST 2006

Using 6.0-RELEASE

I'm trying to use a USB removable drive as a dump device.

The device is recognized and working corectly:
Jan 17 18:12:55 eisenhower kernel: da0 at umass-sim0 bus 0 target 0 lun 0 
Jan 17 18:12:55 eisenhower kernel: da0: <Maxtor 6Y160P0 YAR4> Fixed Direct
Access SCSI-2 device 
Jan 17 18:12:55 eisenhower kernel: da0: 40.000MB/s transfers 
Jan 17 18:12:55 eisenhower kernel: da0: 156334MB (320173056 512 byte
sectors: 255H 63S/T 19929C) 

These are the commands I used to create the device:
# dd if=/dev/zero of=/dev/da0 bs=1k count=1 
# bsdlabel -Bw da0 auto 
# bsdlabel -e da0
# newfs -d0 /dev/da0a 
# mkdir -p /backup
# vi /etc/fstab               # added an entry for /dev/da0a
# mount /backup

The device mounts correctly and I can write to /backup without problems.

The issue is when I try to dump to the device:
# dump 0uafL /dev/da0 / 
   DUMP: Date of this level 0 dump: Tue Jan 17 19:04:22 2006 
   DUMP: Date of last level 0 dump: the epoch 
   DUMP: Dumping snapshot of /dev/ar0s1a (/) to /dev/da0 
   DUMP: mapping (Pass I) [regular files] 
   DUMP: mapping (Pass II) [directories] 
   DUMP: estimated 79952 tape blocks. 
   DUMP: Cannot open output "/dev/da0". 
   DUMP: Do you want to retry the open?: ("yes" or "no") no 
   DUMP: The ENTIRE dump is aborted. 

The same thing happens with:
# dump 0uafL /backup / 

Any ideas?

Mike Loiterman
Tel: 630-302-4944
Fax: 773-442-0992
Email: mike at
PGP Key: 0xD1B9D18E

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