| Nowadays information storage has become more and more important, and all of this poses new challenges of storage capacity of hardware and software, high reliability, efficiency. RAID (Redundant Array of Independent Disk) technology played an important role in the field of information storage. Dual-controller RAID is an important technology to improve RAID reliability. If one single controller fails, the system can still provide continuous service, and avoid user data loss or corruption.During dual-controller RAID in the working process, one controller needs to maintain additional mirrored cache data of the other controller, and this involves a great amount of data transfer, so the high-speed data synchronization channel between RAID controllers plays a vital role in the Dual-controller RAID system.We design the high-speed transfer plan for the data synchronization channel of dual-controller RAID system. Data synchronization channel transfers the controller's cache data in the Linux kernel mode. This includes two different communication implementations. The first implementation is based on TCP / IP protocol, and data is transferred through 10 Gigabit Ethernet channel. In the second implementation, process connects to remote memory segment and maps into its address space, and transfers data through PCIe channel, the hardware devices used are DXH510 host adapters and CX4 copper cable.Performance test shows that the 10 Gigabit Ethernet channel and the PCIe channel both has reached high performance, and the 10 Gigabit Ethernet approach with jumbo frames technology has reached 90% performance. |
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