From: Joe Thornber <thornber@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: change tracking with block-level granularity using md
Date: Fri, 20 Dec 2013 16:35:06 +0000 [thread overview]
Message-ID: <20131220163505.GA15982@debian> (raw)
In-Reply-To: <CABhLV00aksW6BzyNswVeytfUQ+q_7PWag1njYs-E=acqqbXoVA@mail.gmail.com>
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:
https://github.com/jthornber/linux-2.6/blob/era/drivers/md/dm-era-target.c
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:
http://device-mapper.org/blog/2013/11/12/retaining-cache-coherency-with-external-snapshots/
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
prev parent reply other threads:[~2013-12-20 16:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-18 8:04 change tracking with block-level granularity using md Thomas Knauth
2013-12-18 8:35 ` Hannes Reinecke
2013-12-20 16:35 ` Joe Thornber [this message]
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