I wanted to confirm that btrfs will continue to work on raid1 when one
of devices will be gone.
dd if=/dev/null of=img0 bs=1 seek=2G
dd if=/dev/null of=img1 bs=1 seek=2G
mkfs.btrfs -d raid1 -m raid1 img0 img1
losetup /dev/loop1 img0
losetup /dev/loop2 img1
mkdir dir
mount -t btrfs /dev/loop1 dir
btrfs device scan
mount -t btrfs /dev/loop1 dir
echo abc > dir/a.txt
umount dir
losetup -d /dev/loop2
btrfs device scan
mount -t btrfs /dev/loop1 dir
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
am I missing some nuance?
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