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zpool upgrade?

I have a pair of SATA spinning disks set up as a zfs mirrored pair.

This is NOT my boot volume which is an NVME volume. I use it for
my data archive, seen via

john@M21:~$ ls /m21z/m21store
2offload  archive  extraset  mainset  OEDback  temp
4Gramps   dvdprep  JOHN      MARY     tcfiles  versioned

When I check the status I get:

john@M21:~$ zpool status
  pool: m21z
 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.

	m21z        ONLINE       0     0     0
	  mirror-0  ONLINE       0     0     0
	    sda     ONLINE       0     0     0
	    sdb     ONLINE       0     0     0

errors: No known data errors

My question is whether there is any significant risk to doing the
zpool upgrade.

I have noticed that fslint and czkawka don't see the /m21z/m21store/ directory, and
when I manually enter it in the search set, I get
Directories:  Provided folder path must exist, ignoring ⁨/m21z/m21store/⁩
Included Directory ERROR: Not found even one correct path to included which is required

There are a few other apps that can't seem to access the zfs file system.

Any advice?

John Nash

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