vgroup_id	IN:	Vgroup identifier returned by Vattach
	attr_name	IN:	Name of the attribute
	data_type	IN:	Data type of the attribute
	count	IN:	Number of values the attribute contains
	values	IN:	Buffer containing the attribute values

	Purpose	Attaches an attribute to a vgroup.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	Vsetattr attaches an attribute to the vgroup identified by the parameter vgroup_id. The attribute name is specified by the parameter attr_name and the attribute data type is specified by the parameter data_type. The values of the attribute are specified by the parameter values, and the number of values in the attribute is specified by the parameter count. Refer to Table 1A in Section I of this manual for a listing of all valid data types.
		If the attribute already exists, the new values will replace the current ones, provided the data type and the number of attribute values have not been changed. If either the data type or the order have been changed, Vsetattr will return FAIL (or -1).

	FORTRAN	integer vfsnatt(vgroup_id, attr_name, data_type, count, values)
		integer vgroup_id, data_type, count
		<valid numeric data type> values(*)
		character*(*) attr_name
		integer vfscatt(vgroup_id, attr_name, data_type, count, values)
		integer vgroup_id, data_type, count
		character*(*) attr_name, values(*)