| 摘要 |
PROBLEM TO BE SOLVED: To provide a DAS system that sufficiently protects the integrity of cached data and that overcomes limitations of known cache coherency solutions used in DAS systems.SOLUTION: A DAS system that implements RAID technology is provided in which an array of solid state disks (SSDs) that is external to the DAS controllers of the DAS system is used by the DAS controllers as WB cache memory for performing WB caching operations. Using the external SSD array as WB cache memory allows the DAS system to be fully cache coherent without significantly increasing the complexity of the DAS system and without increasing the amount of bandwidth that is utilized for performing the caching operations. In addition, using the external SSD array as WB cache memory obviates the need to mirror the DAS controllers. |
