KEYWORDS: Data storage, Data modeling, Data transmission, Data processing, Reliability, Detection and tracking algorithms, Optimization (mathematics), Computing systems, Bridges, Performance modeling
RAID systems provide both improved capacity and performance as compared to single disk by striping data to multiple
disks, and improve reliability efficiently by redundancy techniques, now RAID becomes key storage device for massive
storage system. There are two ways to implement the RAID system: the first is to implement as a software subsystem
under PC platform, the second is to implement as a hardware controller. The second one is more common. We have
designed and implemented a RAID hardware controller, which called DSDM-FC2000. This paper discusses three kinds
of bottlenecks of the DSDM-FC2000 RAID hardware controller: PCI transmission bottleneck, memory access bottleneck
and CPU computation bottleneck, and then presents an optimized hardware XOR algorithm which can improve the
RAID performance efficiently. Finally this paper gives some advises on designing new generation RAID controller
hardware.
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