I have installed OpenZFSonOsX2.1.0Big.Sur-11-arm64 and it doesn't work with Monterey
A few things to check, terminal first:
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boris@iMac24R ~ %sysctl -a | grep kext
zfs.kext_version: 2.1.0-1
That should tell you whether the kernel extension is loaded and the right one
If you don't get output along these lines then you will need to approve the kernel extension
On an M1 this is a more difficult process in some respects than on Intel, due to its more opaque security
If you have installed over a previous version, the old kernel may not have been removed by the install process - see this:
https://openzfsonosx.org/wiki/FAQ#Q.29_Uninstalling_on_Big_Sur_and_laterApproving kexts occurs in the Security & Privacy Control Panel, General tab and shows up during the install process
That should give you a few pointers, I can assure you that the arm64 version of zfs works well on Monterey with an M1; I am using it on both a laptop and an iMac, the latter as I write this.