公开(公告)号：US4603382A

公开(公告)日：1986-07-29

申请号：US584053

申请日：1984-02-27

申请人： David C. Cole ,  Scott M. Fry ,  Harry O. Hempy ,  Phuoc D. Phan

发明人： David C. Cole ,  Scott M. Fry ,  Harry O. Hempy ,  Phuoc D. Phan

IPC分类号： G06F12/08 ,  G06F3/00 ,  G06F12/00

CPC分类号： G06F12/08

摘要： A peripheral data storage system employing a data buffer connected to a plurality of data storage devices, such as tape recorders, dynamically reallocates data buffer storage segments among the various data storage devices. A normalized elapsed-time period is established based upon the number of accesses to the data storage devices. When the number of accesses reaches a threshold the need for dynamic reallocation is examined. During the elapsed-time period the system monitors which of the allocated buffer segments have any data transfer activity at all and also measures the intensity of the activity for the respective buffer segments. In a peripheral system, the intensity is indicated by the number of channel command retries submitted to a connected host processor for the respective allocated buffer segment. Based upon the allocation status of the buffer segments and intensity of activities of the respective buffer segments, the buffer allocations are selectively reallocated among the data storage devices.

摘要翻译： 采用数据缓冲器的外围数据存储系统，连接到多个数据存储装置，例如磁带录音机，动态地重新分配各种数据存储装置之间的数据缓冲存储段。 基于对数据存储装置的访问次数建立归一化的经过时间段。 当访问次数达到阈值时，将检查对动态重新分配的需求。 在经过时间段期间，系统监视哪个分配的缓冲区段完全具有任何数据传输活动，并且还测量相应缓冲区段的活动强度。 在外设系统中，强度由对相应分配的缓冲区段提交给连接的主机处理器的通道命令重试次数指示。 基于缓冲区段的分配状态和相应缓冲区段的活动强度，缓冲区分配被选择性地重新分配在数据存储设备中。