A week ago, I made my first pool with all current features enabled. All my Linux computers, (miniature desktop, 2 x laptops and miniature media server), have Grub restricted root pools and an additional pool for the rest of the storage. In general the extra pools also has limited features enabled.
When I bought my newer laptop, (going on 3 or 4 years now), I replaced it’s cheap 2.5" 500GB HDD with a 1TB SSD, (and added a 1TB NVMe for mirror). The 500GB HDD got put in the box that the 1TB SATA SSD came in, and forgotten. About few weeks ago it came back to my attention when I looked for a mouse. I then started using it for yet more backups, (of just the OSes for my computers).
So, I was surprised when I ran my second backup and saw this:
pool: Backup500gb
state: ONLINE
scan: scrub repaired 0B in 00:38:13 with 0 errors on Wed Oct 29 11:16:13 2025
config:
NAME STATE READ WRITE CKSUM
Backup500gb ONLINE 0 0 0
sdc1 ONLINE 0 0 0
errors: No known data errors
No complaint about new features that could be enabled, but are not at present. That usually takes up quite a few lines:
pool: rpool
state: ONLINE
status: Some supported and requested 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.
Hopefully I won’t regret using all current ZFS features on this backup disk. I certainly won’t add any new features any time soon. Probably not for years.
Have you any pools that have all the current ZFS features?
And if so, has it bitten you, ever?