Dump failure

From: Simon (ask_at_me.com)
Date: 12/30/04 

Date: Thu, 30 Dec 2004 14:28:20 +0000

I'm attempting to dump my entire /usr filesystem to a mounted disk, but it
keeps failing - apparently at the same point. The filesystem is big - 21GB
- but the mounted disk has plenty of capacity for the task. Here's how it
goes :

dump -0uan -L -f /mnt/<backupname> /usr

  DUMP: Date of this level 0 dump: Thu Dec 30 13:52:42 2004
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping snapshot of /dev/ad0s1f (/usr) to /mnt/usr301204
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 21741832 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: 2.36% done, finished in 3:26
  DUMP: 5.78% done, finished in 2:43
  DUMP: 9.91% done, finished in 2:16
  DUMP: 14.80% done, finished in 1:55
  DUMP: write error 4194340 blocks into volume 1
                   
Broadcast Message from root
        (/dev/ttyp0) at 14:17 GMT...
                   
Message from the dump program to all operators
                   
DUMP: NEEDS ATTENTION: write error 4194340 blocks into volume 1
DUMP WRITE ERROR!

Other filesystems (much smaller) backed-up just fine using the same syntax.

/usr is a live, mounted filesystem, but I thought that would not be an issue
if -L was specified.

Is there anything obvious I've missed or explanations for this failure?

Thanks for your help.

Simon

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