DR_UNIT_BASE

   (Alpha only) DR_UNIT_BASE specifies the base value from which
   unit numbers for DR devices (DIGITAL StorageWorks RAID Array 200
   Family logical RAID drives) are counted.

   DR_UNIT_BASE provides a way for unique RAID device numbers to
   be generated. DR devices are numbered starting with the value of
   DR_UNIT_BASE and then counting from there. For example, setting
   DR_UNIT_BASE to 10 produces device names such as $1$DRA10,
   $1$DRA11, and so on.

   Setting DR_UNIT_BASE to appropriate, nonoverlapping values on all
   cluster members that share the same (nonzero) allocation class
   ensures that no two RAID devices are given the same name.

   DR_UNIT_BASE is a GEN parameter.