Newly replaced disk in 2 disk Mirror appears to have been Striped

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Hmmm. I know the option is there in 12.0; perhaps it only shows up when your pool is mirrors rather than single disks. So in that case, you’re going to need to do it from the CLI. So let’s suppose I want to remove da2 from my pool. First, I need to find the gptid for da2:

root@freenas[~]# glabel status
                                      Name  Status  Components
gptid/03fc8bdc-7ad0-11ec-89be-5183cd5b8f47     N/A  da0p1
                           iso9660/FREENAS     N/A  cd0
gptid/9429193d-7ad3-11ec-bc7b-e584edbb2f19     N/A  da1p2
gptid/9c89e19d-7ad2-11ec-bc7b-e584edbb2f19     N/A  da2p2

Then run zpool remove with that gptid:

root@freenas[~]# zpool remove tank gptid/9c89e19d-7ad2-11ec-bc7b-e584edbb2f19
root@freenas[~]#

Monitor the status using zpool status tank:

root@freenas[~]# zpool status tank
  pool: tank
 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(5) for details.
remove: Evacuation of /dev/gptid/9c89e19d-7ad2-11ec-bc7b-e584edbb2f19 in progress since Fri Jan 28 10:24:07 2022
	1.55G copied out of 2.20G at 32.3M/s, 70.14% done, 0h0m to go
config:

	NAME                                          STATE     READ WRITE CKSUM
	tank                                          ONLINE       0     0     0
	  gptid/9c89e19d-7ad2-11ec-bc7b-e584edbb2f19  ONLINE       0     0     0
	  gptid/9429193d-7ad3-11ec-bc7b-e584edbb2f19  ONLINE       0     0     0

errors: No known data errors
root@freenas[~]#

Once it completes, go back to the pool status page, click the kebab menu next to da1, and select extend:
image
Select da2 as the new disk:
image
And then click Extend. The new disk will be added as a mirror:
image

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