DISK ARRAY SYSTEM INCLUDING A DUAL-PORTED STAGING MEMORY AND CONCURRENT REDUNDANCY CALCULATION CAPABILITY

摘要

The present invention is directed to memory subsystems that use redundant arrays of inexpensive disks (RAID). The subsystem (400) enables dual concurrent accesses to the parity information associated with data being transferred between the host (402) and disk drives (410), by including a dual-ported staging memory (418) where the host and disk drives are coupled to one port and the RAID engine to the other port. Positioning the RAID engine (422) on the opposite side of the staging memory in relation to the host and disk drives allows for pipelined asynchronous memory subsystem operation, improving system throughput.