anything which involved copy_file_range syscall (which is a LOT of things) will fail if it is on ZFS.
https://github.com/openzfs/zfs/issues/15930
https://github.com/zabbly/zfs/commit...ccbd0012920af4
particularly it will kill things like PHP. ruby and most of other scripting stuff.
example from strace of php:
Code:
copy_file_range(5, NULL, 6, NULL, 9223372036854775807, 0) = -1 EOPNOTSUPP (Operation not supported)
at least, this is what I see on 6.8.0-22-generic.