While migrating our file server to a ZFS file system with rsync -avxHAXS ...
I get errors like:
rsync: [generator] set_acl: sys_acl_set_file(path/to/file, ACL_TYPE_ACCESS): Operation not supported (95)
I've already configured ZFS ACL settings with:
zfs set aclmode=passthrough aclinherit=passthrough pool/home
Apparently this error can occur in rsync 3.2.3 (https://github.com/WayneD/rsync/issues/109), but upgrading to the patched 3.2.4 did not solve my issue.