A simulation model to measure direct access storage device (DASD) performance

K. M. Hibson, C. Ebeling
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Abstract

With the vast amounts of data being collected, analyzed and stored for today's information highway, the type and quantity of computer equipment storage media has become critical to the cost of operating a computer data service center. Processor storage is obviously the most desirable medium from a performance perspective, however, it is also the most costly. The other extreme is off-line storage such as a tape cartridge system which is the most inexpensive method but leaves much to be desired with respect to user response time. A reasonable alternative is DASD. In fact, in many installations the "DASD farm" is comparable in cost to the Central Processing Unit (CPU) configuration. The Department of Defense (DOD) is in the process of reducing costs and improving productivity by migrating and consolidating existing application software onto state-of-the-art computer hardware. Integral to this effort is: the Government's attempt to optimize the hardware data storage configurations required to support its users. Through simulation modeling, the BMC manager can analyze alternative configurations without actually incurring the associated expense. The simulation effort discussed in this paper describes an approach taken to model the DASD subsystem. A model was built using the SLAM simulation language.
一个测量直接存取存储设备(DASD)性能的仿真模型
随着当今信息高速公路需要收集、分析和存储大量数据,计算机设备存储介质的类型和数量已成为计算机数据服务中心运营成本的关键。从性能的角度来看,处理器存储显然是最理想的介质,然而,它也是最昂贵的。另一个极端是离线存储,如磁带盒系统,这是最便宜的方法,但在用户响应时间方面还有很多需要改进的地方。一个合理的替代方案是DASD。实际上,在许多安装中,“DASD场”的成本与中央处理单元(CPU)配置相当。美国国防部(DOD)正在通过迁移和整合现有的应用软件到最先进的计算机硬件上来降低成本和提高生产率。这项工作的组成部分是:政府努力优化支持其用户所需的硬件数据存储配置。通过仿真建模,BMC管理器可以分析备选配置,而不会实际产生相关费用。本文所讨论的仿真工作描述了一种对DASD子系统进行建模的方法。采用SLAM仿真语言建立模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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