https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244656
--- Comment #1 from Peter Eriksson <p...@lysator.liu.se> ---
Oh, after many hours it seems to have finished:
# zpool status DATA2
pool: DATA2
state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(7) for details.
scan: resilvered 152K in 0 days 06:07:55 with 0 errors on Sat Mar 7 19:20:01
2020
config:
..
diskid/DISK-7PH8GJTG AVAIL
errors: No known data errors
(The reason it didn't have all features enabled was that I upgraded this server
from 11.3-p6 till 12.1-p2 as one of way to try to fix the problem...
# zpool list
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH
ALTROOT
DATA2 435T 390T 44.8T - - 23% 89% 1.00x ONLINE -
DATA3 145T 75.5T 69.5T - - 11% 52% 1.00x ONLINE -
zroot 113G 35.5G 77.5G - - 56% 31% 1.00x ONLINE -
and now zfs commands don't hang any more...
Now, a wild guess is that it was busy destroying defered-destroyed snapshots.
Since before I restarted this server we had many thousands of those "deleted"
with "zfs destroy -d FS@SNAPSHOT". Hmm.. I wonder if it would be possible to
make this more visible somehow - perhaps a "destroyed-snapshots" counter via a
sysctl or something? And/or have some way to pause the snapshot-deletion thread
(similar to "zfs scrub -p").
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