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1. 发明授权

US5375232A Method and system for asynchronous pre-staging of backup copies in a data processing storage subsystem 失效
标题翻译：数据处理存储子系统中备份副本的异步预分析方法和系统
公开(公告)号：US5375232A
公开(公告)日：1994-12-20
申请号：US949665
申请日：1992-09-23
申请人： Vernon J. Legvold , William F. Micka , Kenneth M. Nagin , Yoram Novick , Pnina A. Vortman , Elfraim Zeidner
发明人： Vernon J. Legvold , William F. Micka , Kenneth M. Nagin , Yoram Novick , Pnina A. Vortman , Elfraim Zeidner
IPC分类号： G06F11/14 , G06F11/00
CPC分类号： G06F11/1466
摘要： A method and system are disclosed for transferring a backup copy of designated datasets stored in a plurality of storage subsystems to a host system via a data channel during concurrent execution of an application. Upon receiving a request for a backup copy, execution of an application is temporarily suspended. A dataset logical-to-physical storage system address concordance for the designated datasets is formed and execution of the application is resumed thereafter. Any application initiated updates to affected portions of the designated datasets which occur prior to generation of a backup copy of the affected portions of the datasets are processed by buffering the updates, copying the affected portions to storage subsystem memory, updating the address concordance and writing the updates to the affected portions of the dataset. The remaining portions of the designated datasets are then copied to storage system memory from the storage subsystem on an asynchronous basis and an attention signal is transmitted to the host system when a lower threshold level is achieved. If an upper threshold level within the storage subsystem memory is achieved, the asynchronous copying of the designated datasets is temporarily suspended. The stored portions of the designated datasets are then transferred from storage subsystem memory to the host system at channel speeds, greatly enhancing the efficiency of data transfer.
摘要翻译：公开了一种方法和系统，用于在并行执行应用程序期间经由数据通道将存储在多个存储子系统中的指定数据集的备份副本传送到主机系统。在接收到备份副本的请求时，应用程序的执行被暂停。形成指定数据集的数据集逻辑到物理存储系统地址一致性，然后恢复应用程序的执行。对生成数据集的受影响部分的备份副本之前发生的指定数据集的受影响部分的任何应用程序启动的更新将通过缓存更新来处理，将受影响的部分复制到存储子系统存储器，更新地址一致性以及写入对数据集的受影响部分的更新。指定数据集的剩余部分然后以异步方式从存储子系统复制到存储系统存储器，并且当实现较低的阈值电平时，将注意信号发送到主机系统。如果达到存储子系统存储器内的上限阈值，则指定数据集的异步复制暂时中止。指定数据集的存储部分然后以信道速度从存储子系统存储器传送到主机系统，大大提高了数据传输的效率。

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