Help adding a disk to a mirror under Big Sur, w/ encryption

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Help adding a disk to a mirror under Big Sur, w/ encryption

Postby jordancurve » Mon Jun 20, 2022 1:29 pm

I'm trying to add a disk to a mirror under Big Sur. The mirror was created under an earlier version of macOS. Its disks use corestorage encryption, following https://openzfsonosx.org/wiki/Encryption . However, when I try to prepare the new disk with `diskutil coreStorage convert`, I get: `diskutil: did not recognize coreStorage verb "convert"`. Any suggestions?
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Re: Help adding a disk to a mirror under Big Sur, w/ encrypt

Postby Sharko » Tue Jun 21, 2022 3:51 pm

Well, thank you for bringing this everyone attention: it appears that Corestorage no longer has encryption capability as of Big Sur. I found this short stackexchange discussion about the problem:

https://apple.stackexchange.com/questio ... on-big-sur

Also Apple Discussions:

https://discussions.apple.com/thread/253810870

The discussion on Apple discussions mentions running Catalina in a VM as a possible solution.

I can confirm that the verb 'convert' no longer exists as an option in the man page for diskutil under Monterey.
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Re: Help adding a disk to a mirror under Big Sur, w/ encrypt

Postby jordancurve » Tue Jun 21, 2022 6:16 pm

Luckily, my Big Sur mac can still read the existing encrypted mirror disks. I only noticed an issue when I tried to add another disk to the mirror. I'd be happy to convert the existing corestorage disks in the mirror to use encrypted APFS, if anyone knows how to do that. Or maybe I could just create the new disk as encrypted APFS, as long as I can still add it to the mirror.
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Re: Help adding a disk to a mirror under Big Sur, w/ encrypt

Postby FadingIntoBlue » Tue Jun 28, 2022 6:20 pm

Any suggestions?


I just wondered if you had considered native ZFS encryption?
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