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Re: [dm-devel] change tracking with block-level granularity using md

On Wed, Dec 18, 2013 at 09:04:17AM +0100, Thomas Knauth wrote:
> Hello list,
> I am the author of the following paper
> https://www.usenix.org/conference/lisa13/technical-sessions/papers/knauth

I've been working on a similar problem.  There's a new target called
dm-era taking shape here:


It uses bloom filters to track changed blocks.  Userland tools will
access snapshots of the metadata via a metadata snapshot.  I expect to
post the finished code to dm-devel some time in Jan.

More information about what I'm trying to do can be found here:


BTW: If you're using dm-thin your backup scenario is trivial.  Just
take a snapshot of the volumes you want to back up.  Take a metadata
snap.  Examine the metadata to see which blocks have changed since you
last backed up.  Copy data.  All you need is already written.

- Joe

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