公开(公告)号：US5606679A

公开(公告)日：1997-02-25

申请号：US396038

申请日：1995-02-28

申请人： Oded Cohn ,  William F. Micka ,  Yosef Moatti ,  Kenneth Nagin ,  Yoram Novick ,  Efaim Zeidner

发明人： Oded Cohn ,  William F. Micka ,  Yosef Moatti ,  Kenneth Nagin ,  Yoram Novick ,  Efaim Zeidner

IPC分类号： G06F3/06 ,  G06F13/14 ,  G06F12/02

CPC分类号： G06F3/0601 ,  G06F2003/0692

摘要： A method and apparatus for improving storage controller throughput and reducing unit control block contention when selecting a Utility Volume for servicing non-specific read requests. Throughput is increased by enabling the storage controller to service non-specific read requests issued against a Utility Volume which is not the same as the device associated with the data that the non-specific read is requesting. The Utility Volume is dynamically selected by considering the current loads on the available devices for both specific and non-specific processing. A Penalty Index is assigned to each volume, wherein the Penalty Index is a weighted average of the specific and non-specific processing. The device having the lowest Penalty Index is selected as the Utility Volume for a session. A Penalty Index evaluation is made at a Reference Point which is further enabled by a random clock to ensure that sessions do not likely pick the same Utility Volume.

摘要翻译： 一种用于在选择用于服务非特定读请求的实用程序卷时改进存储控制器吞吐量并减少单元控制块争用的方法和装置。 通过使存储控制器能够服务于与非特定读取请求的数据相关联的设备不相同的公用程序卷发布的非特定读取请求来增加吞吐量。 通过考虑可用设备上的特定和非特定处理的当前负载来动态选择实用程序卷。 罚款指数被分配给每个卷，其中惩罚指数是特定和非特定处理的加权平均值。 选择具有最低罚款指数的设备作为会话的实用程序卷。 在参考点进行惩罚指数评估，该参考点通过随机时钟进一步启用，以确保会话不太可能选择相同的实用程序卷。