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1. 发明授权

US4445176A Block transfers of information in data processing networks 失效
标题翻译：阻止数据处理网络中的信息传输
公开(公告)号：US4445176A
公开(公告)日：1984-04-24
申请号：US107806
申请日：1979-12-28
申请人： John L. Burk , Roger L. Cormier , Michael H. Hartung , Ray A. Larner , Donald J. Lucas , Kenneth R. Lynch , Brian B. Moore , Howard L. Page , David H. Wansor , Carl Zeitler, Jr.
发明人： John L. Burk , Roger L. Cormier , Michael H. Hartung , Ray A. Larner , Donald J. Lucas , Kenneth R. Lynch , Brian B. Moore , Howard L. Page , David H. Wansor , Carl Zeitler, Jr.
IPC分类号： G06F13/00 , G06F13/12 , G06F15/167
CPC分类号： G06F15/167 , G06F13/122
摘要： Secondary storage subsystems exchange messages and data with host data processing systems and also forward messages between host systems. Host systems thereby communicate with each other in addition to having access to data in subsystem storage. Access to subsystem storage is initiated by a "request" sent from a host to the subsystem. Each request is a message containing an array of one or more commands, each command specifying a transfer of data or a control function to be performed by the subsystem. A subsystem may process more than one request at a time. It also may process the commands in a request in an arbitrary sequence suited to the availability of subsystem resources and data links to host systems. After all commands in a request have been processed the subsystem transmits an associated "completion" message to the host system which originated the request. The completion message indicates the status of completion or abnormal termination of each command in the associated request. An "adapter" processor associated with each host and subsystem operates on an asynchronous basis to transfer messages and data relative to the associated host or subsystem. One or more processing "engines" in each adapter communicates with one or more CPU's in the associated host or subsystem through an associated "adapter store". A portion of each adapter store is used as a buffer pool for constructing "subchannel control spaces" to control transers of messages and data. Elements of each subchannel control space are returned to free status as soon as they are not needed for sustaining associated transfers.
摘要翻译：辅助存储子系统与主机数据处理系统交换消息和数据，并在主机系统之间转发消息。因此，主机系统除了能够访问子系统存储器中的数据之外还相互通信。通过从主机发送到子系统的“请求”启动对子系统存储的访问。每个请求是包含一个或多个命令的数组的消息，每个命令指定要由子系统执行的数据传送或控制功能。子系统可以一次处理多个请求。它还可以以适合于子系统资源的可用性和到主机系统的数据链路的任意顺序处理请求中的命令。在处理请求中的所有命令之后，子系统向发起请求的主机系统发送关联的“完成”消息。完成消息指示相关请求中的每个命令的完成状态或异常终止。与每个主机和子系统相关联的“适配器”处理器在异步的基础上操作以相对于相关联的主机或子系统传送消息和数据。每个适配器中的一个或多个处理“引擎”通过相关联的“适配器存储”与相关主机或子系统中的一个或多个CPU进行通信。每个适配器存储的一部分用作缓冲池，用于构建“子信道控制空间”来控制消息和数据的传输。每个子通道控制空间的元素一旦不需要维持相关的传输就返回到空闲状态。

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