| 冗余SCSI路径驱动程序的设计与实现 |
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| 引用本文： | 谭毓安,曹元大.冗余SCSI路径驱动程序的设计与实现[J].北京理工大学学报,2002,22(5):604-607. |
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| 作者姓名： | 谭毓安 曹元大 |
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| 作者单位： | 北京理工大学,计算机科学与工程系,北京,100081 |
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| 摘 要： | 研究在Unix系统和NT系统中RDP设备驱动程序的设计原理和实现方法.采用了分层结构设计RDP驱动程序,将RDP置于磁盘驱动程序层次之上,避免了直接操作具体的硬件设备.通过对磁盘I/O请求的挂接和处理,实现故障切换和负载均衡.在路径发生故障时由RDP驱动程序将I/O切换到其他路径,以提高系统的可用性.实现了3种算法,通过将I/O负载均衡分布在各SCSI路径,以增加系统I/O处理能力.
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| 关 键 词： | 容错 高可用性 负载均衡 小型计算机系统接口 |
| 文章编号： | 1001-0645(2002)05-0604-04 |
| 收稿时间： | 2001/11/9 0:00:00 |
| 修稿时间： | 2001年11月9日 |
Design and Implementation of Redundant SCSI Path Device Driver |
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| TAN Yu-an and CAO Yuan-da.Design and Implementation of Redundant SCSI Path Device Driver[J].Journal of Beijing Institute of Technology(Natural Science Edition),2002,22(5):604-607. |
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| Authors: | TAN Yu-an and CAO Yuan-da |
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| Institution: | Dept. of Computer Science and Engineering, Beijing Institute of Technology, Beijing100081, China;Dept. of Computer Science and Engineering, Beijing Institute of Technology, Beijing100081, China |
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| Abstract: | An RDP device driver for UNIX and Windows NT operating systems is designed and implemented. By using a multi-layered device driver approach, an RDP driver on top of a disk device driver is implemented, and the problem of direct communication with disk hardwares is solved. To hook and process the disk I/O requests, RDP driver isolates the path failure and balances the I/O requests between paths. The I/O requests of the failure path is switched to the survival path, so the system is more reliable. The driver dispatches the I/O requests to multiple paths via three different algorithms, to increase the system's I/O throughput capacity. |
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| Keywords: | fault tolerance high availability load balance small computer system interface |
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