On Fri, Jul 31, 2015 at 11:50 AM, James <wirel...@tampabay.rr.com> wrote: > > As many know, I have made many failed attempts to get btrfs in raid 1 working > on gentoo, and have to this date, failed. >
Interesting. I've never had any problems with it. I boot using grub2+dracut with root on a single-device btrfs, and /usr on a multi-device raid1 btrfs (and dracut mounts both). As long as you pass a valid root= dracut should just find and mount all the devices for your root. Note that it will attempt to read /etc/fstab and remount your root using whatever is in that, so make sure it is valid. Some relevant config: from grub.cfg: linux /root1/boot/vmlinuz-3.18.19 root=UUID=7d9f3772-a39c-408b-9be0-5fa26eec8342 ro rootflags=subvol=root1 init=/usr/lib/systemd/systemd video=1920x1080-32@60 crashkernel=64M net.ifnames=0 libahci.ignore_sss=1 initrd /root1/boot/initramfs-3.18.19.img from fstab: /dev/disk/by-uuid/7d9f3772-a39c-408b-9be0-5fa26eec8342 / btrfs noatime,ssd,nodiscard,compress=none 0 0 /dev/disk/by-uuid/cd074207-9bc3-402d-bee8-6a8c77d56959 /data btrfs noatime,compress=none 0 0 Compression is transparent - the mount option only affects future writes to the device, and you don't need anything to correctly mount the drive. -- Rich
