You need to do this before you create a volume.
.Pp
Device specific options must come before corresponding devices, e.g.
-.Dl bcachefs format --group=ssd /dev/sda --label=hdd /dev/sdb
+.Dl bcachefs format --label=ssd /dev/sda --label=hdd /dev/sdb
.Bl -tag -width Ds
.It Fl b , Fl -block Ns = Ns Ar size
block size, in bytes (e.g. 4k)
.El
.It Nm Ic device Ic evacuate Ar device
Move data off of a given device
-.It Nm Ic device Ic set-state Oo Ar options Oc Ar device Ar new-state
+.It Nm Ic device Ic set-state Oo Ar options Oc Ar new-state Ar device
.Bl -tag -width Ds
+.It Ar new-state Ns = Ns ( Ar rw | ro | failed | spare )
.It Fl f , Fl -force
Force, if data redundancy will be degraded
.El