Victor Sudakov wrote:

Right now I am watching a dump:

[EMAIL PROTECTED] ~] dump -b64 -5Lau /home
  DUMP: Connection to established.
  DUMP: Date of this level 5 dump: Sat Aug 18 14:02:16 2007
  DUMP: Date of last level 0 dump: Sun Aug 12 11:10:56 2007
  DUMP: Dumping snapshot of /dev/ad0s2f (/home) to /dev/nsa0 on host big
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 3249348 tape blocks.

at the same moment:

[EMAIL PROTECTED] ~] snapinfo -v /home
/dev/ad0s2f mounted on /home
        no snapshots found
[EMAIL PROTECTED] ~] ll /home/.snap/
total 0

Is this normal? Does it mean that dump is not really dumping a
snapshot though it says it is?

man dump (the section regarding -L) says
"The snapshot is unlinked as soon as the dump starts, and is thus removed when the dump is complete." What this means to you is that the snapshot is only visible on the file system for as long as it takes dump to start reading from it, dump will have an open filehandle to the snapshot so it can be unlinked from the filesystem and as soon as dump closed its handle then the snapshot is removed. Similar to when you delete a large logfile a program has open and forget to HUP/stop/restart the program, the logfile's diskspace isnt released until the the program closes its file handle.

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