Marc MERLIN posted on Fri, 12 Feb 2016 19:28:46 -0800 as excerpted: > btrfs send lets you keep COW blocks within a subvolume. > But if I have lots of backups where subvolumes have shared data, and I > need to migrate this to a new filesystem, is there a decent way? > > I know I can btrfs device add new drive as raid1, but I'm trying to > migrate off an old filesystem that likely wasn't created well. Is there > a way to do that? > I guess ideally I'd need btrfs send on a volume level, not subvolume > level. Unless I'm mistaken, what you're looking for is btrfs send -c. You're still sending a subvolume, but the -c says to consider the supplied clone- src parameter for just that, cloned, aka shared, sources, and unlike -p parent, multiple such -c cloned-src options are allowed, so... -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
