On-Line Extraction of SCSI Disk Drive Parameters

Worthington, Bruce L. ; Ganger, Gregory R. ; Patt, Yale N. ; Wilkes, John

HP Development Company

关键词: SCSI disk drives;    parameters;    automatic measurement;   

RP-ID  :  HPL-97-02

学科分类：计算机科学（综合）

美国|英语

来源: HP Labs

【 摘 要 】

Sophisticated disk scheduling algorithms require accurate and detailed disk drive specifications, including information on mechanical delays, on-board caching and prefetching algorithms, command processing and protocol overheads, and logical-to-physical block mappings. Comprehensive disk models used in storage subsystem design require similar levels of detail. This report describes a suite of general-purpose techniques and algorithms for acquiring the necessary data from SCSI disks via the ANSI-standard interface. The accuracy of the extracted information is demonstrated by comparing the behavior of a configurable disk simulator against actual disk drive activity. Detailed measurements extracted from several SCSI disk drives are provided.