On 6/27/20 11:40 PM, Tom Seewald wrote:
On Sat, Jun 27, 2020 at 7:32 PM Garry T. Williams <gtwilliams(a)gmail.com> wrote:
Just a PSA: btrfs raid1 does not have a concept of automatic degraded
mount in the face of a device failure. By default systemd will not
even attempt to mount it if devices are missing.
Is this hopefully seen by upstream as a bug that will be fixed? This removes the system availability benefits of raid, and I've never heard of another system that would behave like this, whether that's zfs, md, or hardware raid.
I agree that it's useful and common for data but booting from degraded
RAID is not universally supported (I think it depends on the boot
manager). Having said that, the flip side of it is that automatic
degraded mount results in a non-redundant system, requiring manual
intervention to restore proper redundancy, anyway.
In other words, we still need a mechanism to notify and ensure that the
raid is rebuilt---too much automation could lead people into false sense
of security.
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