Excerpts from obviously's message of Fri May 13 08:32:05 -0400 2011:

> So my question, how does Bacula do this? Cause I remove the file
> during the backup and flush the cache frequently...

Bacula holds the file open so even though it's removed as far as other
processes are concerned[1], the kernel doesn't free it until the
reference count drops to 0 (eg: when bacula calls fclose()).  These
are standard unix/posix filesystem semantics.

If you were to run lsof -p $pidofbacula-fd, you'd seen an entry for
that file with '(deleted)' beside it.

Flushing the cache won't affect this.

Thanks
-Ben

[1] On many systems it is possible to restore this file as long as
    some process holds it open:
    
http://prefetch.net/blog/index.php/2009/02/25/how-to-undelete-any-open-deleted-file-on-linux-solaris/
--
Ben Walton
Systems Programmer - CHASS
University of Toronto
C:416.407.5610 | W:416.978.4302


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