基于SAN的虚拟化系统元数据组织策略

SAN(storage area netw ork)结构的实现使得多服务器平台可以共享多种存储设备,为了有效利用存储空间并提高数据存储的可靠性,提出一种基于SAN的虚拟化系统元数据分布策略,并将这种分布策略在I/O节点机的SCS I(sm a ll com pu ter system in terface)目标器中间层用软件的方法实现。通过映射位图方式将设备端的存储资源虚拟化,为光纤网络前端的各种异构平台服务器提供统一的存储资源视图。同时对元数据进行分布冗余存储提高系统可靠性。实验与结果表明:该设计减小了对物理存储设备的需求,使存储设备得到可靠且有效的利用。     

Design and Implementation of a Fibre Channel Target Driver Supporting SCSI

Fibre channel storage area networks (FC-SAN) are effective solutions to address storage management problems caused by very large volumes of data. But the expense of fibre channel devices limits FC-SAN applications. The use of IP networks instead of fibre channel networks will reduce SAN cost, but will also reduce the performance. Therefore, small computer system interface (SCSI) devices were considered to replace FC disks to reduce the SAN cost. A driver for the FC network adapter and the FC target, designed and implemented to support this structure, obeys the SCSI protocol and works in target mode with 200 MB/s bandwidth. The FC target architecture and implementation were compared with the FC initiator.The SCSI command transfer process in the FC layer was described. The performance test results show that the maximum I/O throughput reachs 167 MB/s for read requests and 196 MB/s for write requests (FC bandwidth is 200 MB/s), verifying that the FC target is very efficient. The modularization, efficiency, and low cost of the FC target will enable SAN and fibre channel to be more widely used in applications.     

并行逻辑语言PARLOG顺序编译系统的设计

ＰＡＲＬＯＧ语言是一种适合于并行逻辑程序设计的语言，广泛应用于人工智能及并行处理等领域。从 ＰＡＲＬＯＧ的语义描述出发．结合与／或树计算模型及进程调度算法．介绍了 ＳＵＮ工作站上设计实现的一个实用的并行逻辑设计环境——ＰＡＲＬＯＧ顺序编译系统（ＰＳＣＳ）。该系统采用中间抽象机结构．以Ｃ语言为目标语言，不仅具有高效率的执行代码．而且易于移植。