Les Mikesell wrote:
On Wed, 2005-12-21 at 12:30, Marty wrote:
That brings up another question for anyone here -- does cp -al work
(within the filesystem) on the pool, or on the cpool, or is it also
prohibitively time-consuming? If it works (and you don't run out of
inodes) then it seems you could use it to take an snapshot for the
above scripts to work from, to minimize backuppc server downtime.
You'd need -aH to do hardlinks,
Are you sure? If that's true, then all my backup scripts are wrong!
From man cp (Debian):
-H follow command-line symbolic links
I've never used that option, but I've always assumed that it means
replace symbolic links with the files they reference.
but it doesn't really help you
to have copied the data under the pooled names anyway. When
you rsync the pc directories it will copy all the data under
the new name since it has no way to connect that to the pooled
name without the time/memory-intensive step of including the
pool in the rsync run.
Sorry, I think I asked the wrong question. In the original question,
substitute the pc directory for the pool/cpool directory. Then you
have your snapshot, right? The pool file is handled by the script,
but it's much fast the second time around.
There is a linux program called 'hardlink' that will do a
brute-force matchup of indentical files under the specified
directories and convert to hardlinks. I'm not sure how
fast it is but I'd expect it to be slower than something
that knows the backuppc name conventions.
I've used it. Same problem as the other methods. It took a day or so
to replicate a small pool (about 40 GB).
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