For anybody else interested, if you want your system to automatically
boot a degraded btrfs array, here are my crib notes, verified working:
***************************** boot degraded
1. edit /etc/grub.d/10_linux, add degraded to the rootflags
GRUB_CMDLINE_LINUX="rootflags=degraded,subvol=${rootsubvol}
${GRUB_CMDLINE_LINUX}
2. add degraded to options in /etc/fstab also
UUID=bf9ea9b9-54a7-4efc-8003-6ac0b344c6b5 / btrfs
defaults,degraded,subvol=@ 0 1
3. Update and reinstall GRUB to all boot disks
update-grub
grub-install /dev/vda
grub-install /dev/vdb
Now you have a system which will automatically start a degraded array.
******************************************************
Side note: sorry, but I absolutely don't buy the argument that "the
system won't boot without you driving down to its physical location,
standing in front of it, and hammering panickily at a BusyBox prompt" is
the best way to find out your array is degraded. I'll set up a Nagios
module to check for degraded arrays using btrfs fi list instead, thanks...
On 01/03/2014 06:06 PM, Freddie Cash wrote:
Why is manual intervention even needed? Why isn't the filesystem
"smart" enough to mount in a degraded mode automatically?
--
Freddie Cash
fjwc...@gmail.com <mailto:fjwc...@gmail.com>
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
