On 01.06.2015 15:03, Neal Becker wrote: > So I think what I need to do is: > > 1. boot off some rescue media > 2. mount the target btrfs volume (e.g., /mnt/sysimage/root) > 3. mv exising home (mv /mnt/sysimage/home /mnt/sysimage/oldhome) > 4. create new subvolume (btrfs subvolume create /mnt/sysimage/home) > 5. move all the files from /mnt/sysimage/oldhome /mnt/sysimage/home - not > sure easiest way to do this step > 6. edit /mnt/sysimage/etc/fstab to mount new /home > > I have another machine, setup more or less this way: > UUID=7246327b-1905-4fe2-9b6b-b9376017264f / btrfs > subvolid=5,subvol=root00 0 0 > UUID=2c04be93-34c1-4016-ba41-60fd9fd90616 /boot ext4 > defaults 1 2 > UUID=7246327b-1905-4fe2-9b6b-b9376017264f /home btrfs > subvol=home 0 0 > > > > Vytautas D wrote: > >> as far as I know, you can't do this, you need to temporary move /home >> somewhere else, create /home subvolume and copy everything back. >> >> - >> Vytas >> >> On Mon, Jun 1, 2015 at 1:36 PM, Neal Becker <ndbecker2@xxxxxxxxx> wrote: >>> I have everything under /: >>> >>> sudo btrfs subvolume list / >>> ID 257 gen 65795 top level 5 path root >>> >>> I want to move /home onto it's own subvolume. I hope I can do this while >>> the root device is mounted. >>> >>> What is the procedure? >>> >>> I tried first to create a subvolume for /home at the top-level, but >>> couldn't figure out the syntax: >>> >>> [nbecker@nbecker2 ~]$ sudo btrfs subvolume create /home >>> [sudo] password for nbecker: >>> ERROR: '/home' exists >>> i think you can speed up step 5 there by not using mv but cp --reflink=auto and deleting the old copy once you are done. reflinks are shared between subvolumes. justus
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