I'm going to amend what I wrote earlier. The problem with the seed device method, it won't let you change the leafsize. And that means you'll need to go with a new volume with mkfs, and migrate data with btrfs send receive instead.
And to clarify, you don't need to thin out subvolume to start out with on the existing volume. Do the thinning as part of the send/receive strategy. Keep the old raid1 mirror as a read only archive until you're clear you don't need it as much as you need a new backup volume. I wouldn't combine archive and backup in a single device. Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
