Set up a transparent provider on the given devices. If the operation succeeds, the new provider should appear with name /dev/<dev.nop>. The kernel module geom_nop.ko will be loaded if it is not loaded already.
Configure existing transparent provider. At the moment it is only used for changing failure probability. The kernel module geom_nop.ko will be loaded if it is not loaded already.
Debug level of the NOP GEOM class. This can be set to a number between 0 and 2 inclusive. If set to 0 minimal debug information is printed, and if set to 2 the maximum amount of debug information is printed.