I was replacing disks on file server and changed ufs to zfs.
I'm restoring from ufs disk to zfs disks by dump & restore as follow.
% uname -a
FreeBSD onion.ish.org 12.2-RC2 FreeBSD 12.2-RC2 r366553 GENERIC amd64
# cd /media
# dump 0af - /dev/ada4p1 | restore rf -
DUMP: Date of this level 0 dump: Thu Oct 15 08:59:56 2020
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/ada4p1 to standard output
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 3755618369 tape blocks.
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
warning: ./music: File exists
warning: ./tmp: File exists
warning: ./video: File exists
warning: ./backup: File exists
DUMP: 0.38% done, finished in 22:08 at Fri Oct 16 07:13:35 2020
DUMP: 0.78% done, finished in 21:12 at Fri Oct 16 06:23:01 2020
DUMP: 1.19% done, finished in 20:46 at Fri Oct 16 06:02:19 2020
DUMP: 56.47% done, finished in 9:41 at Fri Oct 16 07:17:28 2020
DUMP: 56.76% done, finished in 9:39 at Fri Oct 16 07:19:30 2020
DUMP: 57.06% done, finished in 9:35 at Fri Oct 16 07:21:11 2020
DUMP: DUMP: 3755618304 tape blocks
DUMP: finished in 85596 seconds, throughput 43876 KBytes/sec
DUMP: DUMP IS DONE
The timeest() didn't show after 57.06% of dump.
I checked disks after about 30 minutes of 57.06%.
% zfs list
NAME USED AVAIL REFER MOUNTPOINT
onion 3.07T 25.1T 153K none
onion/ROOT 289M 25.1T 153K none
onion/ROOT/default 289M 25.1T 289M /
onion/media 2.10T 25.1T 12.3M /media
onion/media/backup 43.3G 25.1T 43.3G /media/backup
onion/media/music 188G 25.1T 188G /media/music
onion/media/tmp 153K 25.1T 153K /media/tmp
onion/media/video 1.88T 25.1T 1.88T /media/video
It seems that dump doesn't show timeest() after dumping 2TB.
Some counter are overflowing ?