Hi everyone, first of all, I want to say that I'm learning how to use BTRFS and I really enjoy all the subvolume and the snapshot features. Also, I'm a backup freak :P Basically, I have 4 questions : 1. I would like to know what is the best way to install a Linux distribution inside a BTRFS partition ? I mean, do I install it directly inside the subvolid=0 or I create a subvolume for exemple @root to leave the subvolid=0 clean and without any data, of course only subvolume and then I install my distro inside the @root subvolume ? I'm asking that, because I saw that Ubuntu 11.04 use the subvolume @ and @home to install the distribution files so, the subvolid=0 is clean. I saw that because at boot time, the /boot/grub/grub.cfg use this param with Grub2 : rootflags=subvol=@ 2. I would like to know if this Live backup method is correct ? +++++ My /dev/sda2 contains a @root subvolume that contains my distribution, my /home directory is inside an another subvolume that is at the same level that @root. # mkdir /mnt/disklayout # mount /dev/sda2 /mnt/disklayout -o subvolid=0 # cd /mnt/disklayout # btrfs subvolume snapshot @root snapshot-@racine-live # btrfs subvolume snapshot @home snapshot-@home-live # mount /dev/sdb1 /mnt/backup -o subvol=@backup # time rsync -aHA --del --force --stats --progress snapshot-@racine-live/ /mnt/backup/funtoo # time rsync -aHA --del --force --stats --progress snapshot-@home-live/ /mnt/backup/funtoo/home # time rsync -aHA --del --force --stats --progress /boot/ /mnt/backup/funtoo/boot # cd /mnt/disklayout # btrfs subvolume delete snapshot-@root-live # btrfs subvolume delete snapshot-@home-live # cd / # umount /mnt/disklayout Creation of the snapshot : # cd / # umount /mnt/backup # mount /dev/sdb1 /mnt/backup -o subvolid=0 # cd /mnt/backup # btrfs subvolume snapshot @backup @snap-20110502 # btrfs subvolume list . # cd /mnt/backup # ls -la # cd @snap-20110502 # ls -la # cd / # umount /mnt/backup ------ 3. Is there any objection to use a snapshot name or a subvolume that start with a @ ? 4. Finally,I would like to know if we can rename subvolume ? The best example is this : I crash my box but I made earlier a snapshot that is named @snap-20110502 inside my subvolid=0. Now that my @root is brain dead, I would like to delete it and rename the @snap-20110502 to @root ? Is this possible and if so, can I use the mv command or something else ? I'm sure that I will need to boot with a LiveCD to do so, but for the rest, is this possible ? Thanks you very much !!! -- Salut alp Sylvain -- 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
