Hello, I am experimenting with BTRFS and RAID1 on my Debian Wheezy (with backported kernel 3.12-0.bpo.1-amd64) using a a motherboard with UEFI. However I haven't managed to make the system boot when the removing the first hard drive. I have installed Debian with the following partition on the first hard drive (no BTRFS subsystem): /dev/sda1: for / (BTRFS) /dev/sda2: for /home (BTRFS) /dev/sda3: for swap Then I added another drive for a RAID1 configuration (with btrfs balance) and I installed grub on the second hard drive with "grub-install /dev/sdb". If I boot on sdb, it takes sda1 as the root filesystem If I switched the cable, it always take the first hard drive as the root filesystem (now sdb) If I disconnect /dev/sda, the system doesn't boot with a message saying that it hasn't found the UUID: Scanning for BTRFS filesystems... mount: mounting /dev/disk/by-uuid/c64fca2a-5700-4cca-abac-3a61f2f7486c on /root failed: Invalid argument Can you tell me what I have done incorrectly ? Is it because of UEFI ? If yes I haven't understood how I can correct it in a simple way. As extra question, I don't see also how I can configure the system to get the correct swap in case of disk failure. Should I force both swap partition to have the same UUID ? Many thanks in advance ! **************************************************** Here are some outputs for info: btrfs filesystem show Label: none uuid: 743d6b3b-71a7-4869-a0af-83549555284b Total devices 2 FS bytes used 27.96MB devid 1 size 897.98GB used 3.03GB path /dev/sda2 devid 2 size 897.98GB used 3.03GB path /dev/sdb2 Label: none uuid: c64fca2a-5700-4cca-abac-3a61f2f7486c Total devices 2 FS bytes used 3.85GB devid 1 size 27.94GB used 7.03GB path /dev/sda1 devid 2 size 27.94GB used 7.03GB path /dev/sdb1 blkid /dev/sda1: UUID="c64fca2a-5700-4cca-abac-3a61f2f7486c" UUID_SUB="77ffad34-681c-4c43-9143-9b73da7d1ae3" TYPE="btrfs" /dev/sda3: UUID="469715b2-2fa3-4462-b6f5-62c04a60a4a2" TYPE="swap" /dev/sda2: UUID="743d6b3b-71a7-4869-a0af-83549555284b" UUID_SUB="744510f5-5bd5-4df4-b8c4-0fc1a853199a" TYPE="btrfs" /dev/sdb1: UUID="c64fca2a-5700-4cca-abac-3a61f2f7486c" UUID_SUB="2615fd98-f2ad-4e7b-84bc-0ee7f9770ca0" TYPE="btrfs" /dev/sdb2: UUID="743d6b3b-71a7-4869-a0af-83549555284b" UUID_SUB="8783a7b1-57ef-4bcc-ae7f-be20761e9a19" TYPE="btrfs" /dev/sdb3: UUID="56fbbe2f-7048-488f-b263-ab2eb000d1e1" TYPE="swap" cat /etc/fstab # <file system> <mount point> <type> <options> <dump> <pass> UUID=c64fca2a-5700-4cca-abac-3a61f2f7486c / btrfs defaults 0 1 UUID=743d6b3b-71a7-4869-a0af-83549555284b /home btrfs defaults 0 2 UUID=469715b2-2fa3-4462-b6f5-62c04a60a4a2 none swap sw 0 0 cat /boot/grub/grub.cfg # # DO NOT EDIT THIS FILE # # It is automatically generated by grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then load_env fi set default="0" if [ "${prev_saved_entry}" ]; then set saved_entry="${prev_saved_entry}" save_env saved_entry set prev_saved_entry save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z "${boot_once}" ]; then saved_entry="${chosen}" save_env saved_entry fi } function load_video { insmod vbe insmod vga insmod video_bochs insmod video_cirrus } insmod part_msdos insmod btrfs set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set=root c64fca2a-5700-4cca-abac-3a61f2f7486c if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 load_video insmod gfxterm insmod part_msdos insmod btrfs set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set=root c64fca2a-5700-4cca-abac-3a61f2f7486c set locale_dir=($root)/boot/grub/locale set lang=fr_FR insmod gettext fi terminal_output gfxterm set timeout=5 ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### insmod part_msdos insmod btrfs set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set=root c64fca2a-5700-4cca-abac-3a61f2f7486c insmod png if background_image /usr/share/images/desktop-base/joy-grub.png; then set color_normal=white/black set color_highlight=black/white else set menu_color_normal=cyan/blue set menu_color_highlight=white/blue fi ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### menuentry 'Debian GNU/Linux, with Linux 3.12-0.bpo.1-amd64' --class debian --class gnu-linux --class gnu --class os { load_video insmod gzio insmod part_msdos insmod btrfs set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set=root c64fca2a-5700-4cca-abac-3a61f2f7486c echo 'Chargement de Linux 3.12-0.bpo.1-amd64 ...' linux /boot/vmlinuz-3.12-0.bpo.1-amd64 root=UUID=c64fca2a-5700-4cca-abac-3a61f2f7486c ro quiet echo 'Chargement du disque mémoire initial ...' initrd /boot/initrd.img-3.12-0.bpo.1-amd64 } menuentry 'Debian GNU/Linux, with Linux 3.12-0.bpo.1-amd64 (mode de dépannage)' --class debian --class gnu-linux --class gnu --class os { load_video insmod gzio insmod part_msdos insmod btrfs set root='(hd1,msdos1)' search --no-floppy --fs-uuid --set=root c64fca2a-5700-4cca-abac-3a61f2f7486c echo 'Chargement de Linux 3.12-0.bpo.1-amd64 ...' linux /boot/vmlinuz-3.12-0.bpo.1-amd64 root=UUID=c64fca2a-5700-4cca-abac-3a61f2f7486c ro single echo 'Chargement du disque mémoire initial ...' initrd /boot/initrd.img-3.12-0.bpo.1-amd64 } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_linux_xen ### ### END /etc/grub.d/20_linux_xen ### ### BEGIN /etc/grub.d/30_os-prober ### ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### ### BEGIN /etc/grub.d/41_custom ### if [ -f $prefix/custom.cfg ]; then source $prefix/custom.cfg; fi ### END /etc/grub.d/41_custom ### -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html