According to the btrfs document[1], adding another disk to the existing
btrfs file system is equivalent to create a raid with Raid 1 on Meta,
Raid 0 on Data group (mkfs.btrfs -m raid1 -d raid0).
So when wiping one of the disks out, it will corrupt the data but the meta
should be OK:
# btrfs fi show
Label: none uuid: 3e7e0fb5-5fec-4938-bc20-0e5dfdf466ff
Total devices 2 FS bytes used 128.00KiB
devid 1 size 512.00MiB used 88.00MiB path /dev/loop0
*** Some devices missing
This behaviour in this test case has been changed in the kernel with
commit 4330e183c9537df20952d4a9ee142c536fb8ae54, we should be able to
mount the drive with 'rw' in degraded mode, unless the data chunk was
destroyed.
[1]
https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices
** Changed in: ubuntu-kernel-tests
Assignee: (unassigned) => Po-Hsu Lin (cypressyew)
** Changed in: ubuntu-kernel-tests
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1809870
Title:
2365dd3ca02bbb6d3412404482e1d85752549953 in ubuntu_btrfs_kernel_fixes
failed on B
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