The easy fix here is to change:
GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol}
${GRUB_CMDLINE_LINUX}"
to:
GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol},degraded
${GRUB_CMDLINE_LINUX}"
in /etc/grub.d/10_linux.
Any time your root filesystem is on btrfs, attempting to boot in a degraded
state is the best choice to help recovery. You can't rebuild your btrfs raid
without swapping disks and running a balance.
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https://bugs.launchpad.net/bugs/1229456
Title:
Provide way to pass rootflags=degraded (for btrfs)
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