On Tue, Dec 07, 2010 at 01:07:50PM -0500, Jeffrey J. Kosowsky wrote:
> 2. More importantly, there is no fast way
No, there really isn't.
> that I know of checking whether a pc entry with more than one link
> is in the pool. You first need to read in the 1st MB of each file,
> calculate the partial file md5sum, then see if it is present in
> the pool and then if there is a chain of files with the same
> partial md5sum, you need to compare the files individually. All
> the pieces to do that are in my various posted routines and code
> snippets, it's just not wrapped with one big for loop to go
> through the pc directory.
BackupPC_fixLinks is very close; I posted my changes seperately. To
productionalize them they should be tied to an option flag, because
yeah, *SLOW*. But I've apparently lost some hundreds of GiB this
way (because that's how big the tarPCCopy file was when I ran out of
space -_-), and I want it back.
> Still, blindly traversing the entire pc tree will generally be an
> order of magnitude slower or more than traversing the pool
> assuming that you have a lot of current and incrementals. If you
> are satisfied just going through the latest backup then it might
> be more manageable...
Unfortunately, no. And yes, just doing this one customer is going
to take days. Plural.
> In fact, it was for applications like this that I had suggested a
> while back adding the partial md5sum to the attrib file so that
> the reverse lookup can be done more cheaply
That would, in fact, be fantastic.
> (the need for all of this will be obviated when Craig finishes the
> next version :P )
Oh? How's that looking?
-Robin
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