| Nowadays, the I/O performance of a network server, which becomes the key issue in future server technology, is driver by the continuous development in network technology. This paper focuses to design a I2O based RAID system and to implement its Hardware Device Module, which not only have a positive impact on server's I/O performance via RAID technology, but also relieve host CPU from I/O interrupt by I2O technology. Besides, the device driver model provided by I2O specification will remarkably simplify the developing procedure of device drivers.Firstly, the I2O specification and its system structure will be introduced as basic knowledge. And IxWorks, chosen as an I2O embedded system for this paper, will be introduced in detail on its characteristics, services and integrated developing environment Tornado. Secondly, after a systematic introduction on background knowledge, a structural design of an I2O based RAID system will be delivered both on hardware structure and software one. The detailed functions of each module will also be defined as the foundation for further implementation. The implementation process of Hardware Device Module will also be described step by step, including the establishment of RAM Disk, the establishment of Module Parameter Block, Parameter Groups and Message Handlers. Also, several key functions will be listed to reveal the details of implementation. Finally, the Hardware Device Module will be installed and tested to prove its functionality. And IOMeter will be used to evaluate the I/O performance of the I2O based RAID system to prove that the system has a great advantage on I/O performance compared with traditional I/O devices. |
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