Just to be clear, I did not remove any disk from the said pool, and I don't know why I would??
As you said, I would have thought that if 1 disk goes bad, then all the data is still there on the other disk, but in my case , it it missing completely. Only 3 folders exist on the disk now
The other 2 pools are fine and all fine and the data is there.
I have only copied the history from before I upgraded to TrueNAS 13.0, and all the data was on the disks.
2022-06-12.09:34:46 zpool import 2390377312181417493 Backup_Data
2022-06-12.09:34:46 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-06-12.09:35:03 zfs snapshot Backup_Data/.system/samba4@wbc-1655022898
2022-06-12.09:40:08 zpool import 2390377312181417493 Backup_Data
2022-06-12.09:40:08 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-06-12.09:40:25 zfs snapshot Backup_Data/.system/samba4@wbc-1655023220
2022-06-28.20:41:37 zfs destroy Backup_Data/.system/
samba4@update--2021-08-06-07-34--12.0-U4.1
2022-06-28.20:41:42 zfs snapshot Backup_Data/.system/
samba4@update--2022-06-28-19-41--12.0-U8.1
2022-06-28.20:44:25 zpool import 2390377312181417493 Backup_Data
2022-06-28.20:44:25 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-06-28.20:44:38 zfs set acltype=off Backup_Data/.system
2022-06-28.20:44:41 zfs snapshot Backup_Data/.system/samba4@wbc-1656445480
2022-07-09.23:15:37 zpool import 2390377312181417493 Backup_Data
2022-07-09.23:15:38 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-07-09.23:15:53 zfs snapshot Backup_Data/.system/samba4@wbc-1657404952
2022-07-10.12:01:59 zpool import 2390377312181417493 Backup_Data
2022-07-10.12:01:59 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-07-10.12:02:14 zfs snapshot Backup_Data/.system/samba4@wbc-1657450933
2022-07-10.13:01:58 zpool import 2390377312181417493 Backup_Data
2022-07-10.13:01:58 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-07-10.13:02:13 zfs snapshot Backup_Data/.system/samba4@wbc-1657454533
2022-07-10.13:13:29 zpool import 2390377312181417493 Backup_Data
2022-07-10.13:13:29 zpool set cachefile=/data/zfs/zpool.cache Backup_Data
2022-07-10.13:13:43 zfs snapshot Backup_Data/.system/samba4@wbc-1657455223
root@freenas:~ # glabel status
Name Status Components
gptid/258dc84a-823c-11e9-be50-0cc47a0c1eef N/A ada0p1
gptid/3deb57ca-820a-11e9-ac36-001f16a89eef N/A ada1p1
gptid/459c45ee-4792-11e6-a4b6-0cc47a0c1eef N/A da0p2
gptid/464e7612-4792-11e6-a4b6-0cc47a0c1eef N/A da1p2
gptid/ce563f3f-528e-11e6-9216-0cc47a0c1eef N/A da2p2
gptid/cf115aaa-528e-11e6-9216-0cc47a0c1eef N/A da3p2
gptid/434eb5fb-4792-11e6-a4b6-0cc47a0c1eef N/A da4p2
gptid/44db1bfb-4792-11e6-a4b6-0cc47a0c1eef N/A da5p2
gptid/441279f9-4792-11e6-a4b6-0cc47a0c1eef N/A da6p2
gptid/d647d843-4792-11e6-a4b6-0cc47a0c1eef N/A da7p2