From: David Alcorn <nroclaed@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Install to or Recover RAID Array Subvolume Root?
Date: Mon, 18 Apr 2016 13:22:34 +0800 [thread overview]
Message-ID: <CALq5X_gB0YkRMZx7Af+gAYdYRhojiKSCV9r3g8YPG6_8YR+9DQ@mail.gmail.com> (raw)
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.
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. df -h reports:
Filesystem Size Used Avail Use% Mounted on
udev 10M 0 10M 0% /dev
tmpfs 790M 8.6M 781M 2% /run
/dev/sdb3 3.8G 1.1G 2.4G 31% /
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sdb1 93M 311K 93M 1% /boot/efi
/dev/sde 22T 4.9T 13T 29% /lit
next reply other threads:[~2016-04-18 5:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-18 5:22 David Alcorn [this message]
2016-04-18 12:31 ` Install to or Recover RAID Array Subvolume Root? Austin S. Hemmelgarn
2016-04-18 15:12 ` Chris Murphy
2016-04-18 15:15 ` Austin S. Hemmelgarn
2016-04-18 15:39 ` Chris Murphy
2016-04-18 15:52 ` Austin S. Hemmelgarn
2016-04-18 16:18 ` Chris Murphy
2016-04-18 20:34 ` Nicholas D Steeves
2016-04-19 11:14 ` Austin S. Hemmelgarn
2016-04-19 21:43 ` Nicholas D Steeves
2016-04-18 20:42 ` Nicholas D Steeves
2016-04-19 3:06 ` David Alcorn
2016-04-19 20:53 ` Nicholas D Steeves
2016-04-22 10:44 ` David Alcorn
2016-04-25 19:38 ` Nicholas D Steeves
2016-04-26 9:23 ` David Alcorn
2016-04-27 12:03 ` Nicholas D Steeves
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