This object indicates the amount of data unit replaced in the
last one hour in DRE cache. DRE stores the actual data as data
units in the cache data block. If new data units have to be
stored in the cache, the older data units in the cache are
evicted in First-In-First-Out (FIFO) order. This object would
also indicate how much new data units have been stored in the
DRE cache in the past one hour.