RAID APPARATUS, CONTROL UNIT FOR RAID APPARATUS, AND WRITE-BACK CONTROL METHOD FOR RAID APPARATUS

摘要

PROBLEM TO BE SOLVED: To improve write-back efficiency when a RAID apparatus supporting a RAID 4/a RAID 5/a RAID 6 supports a RAID level other than the RAID 4/the RAID 5/the RAID 6. SOLUTION: A buffer management part 19 manages the number of buffer acquisition waiting and, when dirty data are data of the RAID 4/the RAID 5/the RAID 6 and the number of buffer acquisition waiting is not equal to or smaller than a prescribed number N, a write-back schedule part 42 does not write back the dirty data. COPYRIGHT: (C)2009,JPO&INPIT