extlinux and btrfs RAID-1

[Hugo Mills <hugo@carfax.org.uk>]

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   I'm trying to get a system booting, and I'm having something of a
hard time with it. I'd like to check whether anyone's managed to do
what I'm attempting, and whether I'm doing something silly, or just
need to upgrade something.

   I've got two disks, /dev/sda and /dev/sdb, each partitioned the
same way, with GPTs. The second partition on each is part of a RAID-1
(data and metadata) btrfs, with no compression.

# btrfs fi show
Label: 'amelia'  uuid: cba252b5-af1b-4f31-9f8f-191ef66f777d
	   Total devices 2 FS bytes used 1.03GB
	   devid    1 size 275.48GB used 3.04GB path /dev/sda2
	   devid    2 size 275.48GB used 3.03GB path /dev/sdb2

   I have the gptmbr.bin from extlinux installed on the boot sector of
each device:

# cat /usr/lib/syslinux/gptmbr.bin >/dev/sda
# cat /usr/lib/syslinux/gptmbr.bin >/dev/sdb

   I've attempted to install extlinux from a chroot:

# extlinux --install /boot/extlinux

   This is extlinux 4.05, which claims (on the syslinux website) to
support btrfs.

   When I boot the machine from its disks, I'm being told that
extlinux only supports single-disk btrfs. Is this still the case? Or
am I just using a version that's far too old? (Looks like there's a
v6.01 available). I can't see a list of the limitations and
capabilities of syslinux and btrfs on the syslinux website.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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