On Fri, Dec 21, 2012 at 01:16:59PM -0500, Gene Czarcinski wrote: > I am new at this btrfs stuff! > > As I understand it, you can add a physical disk or partition and > have data spread into the new space. You can also move data off a > disk or partition and then remove it. > > Has any though been given to being able merge to existing > (separate) btrfs "volumes" into a single volume?
This would be difficult to do in kernel space -- you'd have to change the UUIDs on all the metadata on at least one of the filesystems, plus handle (correctly) all of the numberspace clashes correctly -- subvolume trees, virtual address space, and probably a load that I've forgotten as well. Given what I'm about to say, I can't see this happening any time soon. > Alternatively, how about at tool for transfering a subvolume from > one pool to another? I tried using fsarchiver but that did not work > out too well. You want send/receive. It's in the mainline kernel, and you'll need a recent userspace, but it allows you to transfer subvolumes cleanly and losslessly between filesystems. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- "You are not stuck in traffic: you are traffic." ---
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