On 2016-04-18 01:22, David Alcorn wrote:
Debian's default installer (1) can not create a BTRFS raid array
during installation, and (2) installs to the default subvol of the
BTRFS target. The default subvol is 5 (BTRFS root) unless (i) prior
to installation a BTRFS file-system was created, (ii) the default
subvol is set to something other than 5, and (iii) you do not format
the installation target during install. This perspective benefits from
https://aykevl.nl/2015/11/debian-btrfs-subvolume.
Can Debian install BTRFS to a pre-existing BTRFS RAID 6 array? If the
array's default is set to ,say subvolid 257, can I install to array
subvolume 257? The goal is to install to a subvolume on the array
without disturbing date on other array subvolumes.
This is really something you should be asking on the Debian mailing
list, or on one of their IRC channels. That said, based on my limited
knowledge of the current state of the Debian installer, I think it
should work, but I"m not certain. I don't really use Debian much
anymore except on a couple of Raspberry Pi's at work, so I really can't
give a much better answer (Ironically, limitations like this in the
installer are part of why I switched to Gentoo).
I erred and shutdown my NAS during a balance. Grub lost track of my
root. Root was on RAID 6 array subvolid 257. I can boot a different
root from a USB flash drive but neither update-grub not install-grub
sees my old root on array subvolid 257. I am happy to either recover
or lose array subvolid 257 but do not want to lose data on other array
subvol's. I prefer to have my root on the array rather than a flash
drive. The balance completed successfully after I booted from the
flash drive.
I am running a debian back-ported 4.4.0 kernel with btrfs-progs v4.4
on both my flash drive and array subvolid 257. Both installs are
UEFI.
It's rather refreshing to see somebody using an up to date kernel and
userspace for once. The issue with GRUB is however likely an issue with
GRUB itself though (or possibly with something it uses for detecting
filesystems), which brings up the question: How recent is the version of
GRUB you're trying to install? I would not be surprised if their
current support for BTRFS raid5 and raid6 is not particularly good,
especially considering that their support for BTRFS raid1 was kind of
shoddy at first (and it still has occasional issues, like not working
right half the time if one of the devices is missing).
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