XCP-ng上で、FreeBSD 11.2のVMを作って、Disk追加して、追加したDiskをzfs の vdev=diskで作成しようとした。

# zpool create -O atime=off -O normalization=formD zdata disk /dev/ada1
cannot open 'disk': no such GEOM provider
must be a full path or shorthand device name

なぜ？どうして？ ちっともわからなかったのだが、ふと

# zpool create -O atime=off -O normalization=formD zdata /dev/ada1

で成功する。

なんでこんなところのI/Fがman pageと違うんだ？

     zpool create [-fnd] [-o property=value] ...
           [-O file-system-property=value] ... [-m mountpoint] [-R root]
           [-t tempname] pool vdev ...
....
   Virtual Devices (vdevs)
     A "virtual device" (vdev) describes a single device or a collection of
     devices organized according to certain performance and fault
     characteristics. The following virtual devices are supported:

     disk    A block device, typically located under /dev.  ZFS can use
             individual slices or partitions, though the recommended mode of
             operation is to use whole disks. A disk can be specified by a
             full path to the device or the geom(4) provider name. When given
             a whole disk, ZFS automatically labels the disk, if necessary.

どこにも vdev を省略可能なんて書いてねーぞ!