Shows the total number of On/Off CoD memory units that were activated but have not been reclaimed by the managed system since the On/Off CoD request expired. As long as these memory units are assigned to partitions, unreturned memory days are recorded at the beginning of each 24-hour period. You will be charged for these unreturned memory days at the end of the On/Off CoD billing cycle. To make the memory available to be reclaimed by the managed system, you need to remove the memory units from the partition to which they are assigned. In some cases, you might want to delete the specific partition to which the memory units were assigned.