Method to manage path failure thresholds
First Claim
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1. A method to minimize performance degradation during communication path failure in a data processing system, the data processing system comprising a host computer, a storage controller and a plurality of physical paths in communication with the host computer and the storage controller, the method comprising:
- establishing a threshold communication path error rate via a failure threshold command;
determining an (i) th actual communication path error rate for an (i) th physical communication path, wherein said (i)th physical communication path is one of said plurality of physical communication paths in communication with said host computer and said storage controller;
discontinuing use of said (i)th physical communication path if said (i)th actual communication path error rate is greater than said threshold communication path error rate; and
whereinthe host computer comprises at least one channel path identifier (CHPid); and
,the failure threshold command enables provision of path failure threshold rules to determine when a CHPid has reached a failed state condition;
the failure threshold command includes parameters that contain path failure threshold rules; and
,the storage controller uses the path failure threshold rules to determine when a CHPid has reached a failed state;
the path failure threshold rules are maintained in a storage controller CHPid information data structure;
the failure threshold command enables a host to have control over path failures detected by the storage controller; and
,the failure threshold command enables path failure threshold rules to be set up equally for all CHPid, equally for all CHPid that comprise a path group, differently for each CHPid, or a combination based on a number of paths available at a time of a path failure detection.
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Abstract
A failure threshold host command that provides a host with the capability to tune a storage controller path failure threshold based on the host application performance requirements. The failure threshold host command comprises path failure threshold rules that the storage controller uses to determine when a CHPid has reached a failed state condition.
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Citations
10 Claims
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1. A method to minimize performance degradation during communication path failure in a data processing system, the data processing system comprising a host computer, a storage controller and a plurality of physical paths in communication with the host computer and the storage controller, the method comprising:
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establishing a threshold communication path error rate via a failure threshold command; determining an (i) th actual communication path error rate for an (i) th physical communication path, wherein said (i)th physical communication path is one of said plurality of physical communication paths in communication with said host computer and said storage controller; discontinuing use of said (i)th physical communication path if said (i)th actual communication path error rate is greater than said threshold communication path error rate; and
whereinthe host computer comprises at least one channel path identifier (CHPid); and
,the failure threshold command enables provision of path failure threshold rules to determine when a CHPid has reached a failed state condition; the failure threshold command includes parameters that contain path failure threshold rules; and
,the storage controller uses the path failure threshold rules to determine when a CHPid has reached a failed state; the path failure threshold rules are maintained in a storage controller CHPid information data structure; the failure threshold command enables a host to have control over path failures detected by the storage controller; and
,the failure threshold command enables path failure threshold rules to be set up equally for all CHPid, equally for all CHPid that comprise a path group, differently for each CHPid, or a combination based on a number of paths available at a time of a path failure detection.
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2. A method to minimize performance degradation during communication path failure in a data processing system, the data processing system comprising a host computer, a storage controller and a plurality of physical paths in communication with the host computer and the storage controller, the method comprising:
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establishing a threshold communication path error rate via a failure threshold command; determining an (i)th actual communication path error rate for an (i)th physical communication path, wherein said (i)th physical communication path is one of said plurality of physical communication paths in communication with said host computer and said storage controller; discontinuing use of said (i)th physical communication path if said (i)th actual communication path error rate is greater than said threshold communication path error rate; and
whereinthe host computer comprises at least one channel path identifier (CHPid); and
,the failure threshold command enables provision of path failure threshold rules to determine when a CHPid has reached a failed state condition; the failure threshold command includes parameters that contain path failure threshold rules; the storage controller uses the path failure threshold rules to determine when a CHPid has reached a failed state; and
,the threshold rules defined by the failure threshold host command are based on desired application performance. - View Dependent Claims (3)
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4. An apparatus to minimize performance degradation during communication path failure in a data processing system, the data processing system comprising a host computer, a storage controller and a plurality of physical paths in communication with the host computer and the storage controller, the apparatus comprising:
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means for establishing a threshold communication path error rate via a failure threshold command; means for determining an (i)th actual communication path error rate for an (i)th physical communication path, wherein said (i)th physical communication path is one of said plurality of physical communication paths in communication with said host computer and said storage controller; means for discontinuing use of said (i)th physical communication path if said (i)th actual communication path error rate is greater than said threshold communication path error rate; and
wherein,the host computer comprises at least one channel path identifier (CHPid); and
,the failure threshold command enables provision of path failure threshold rules to determine when a CHPid has reached a failed state condition; the failure threshold command includes parameters that contain path failure threshold rules; the storage controller uses the path failure threshold rules to determine when a CHPid has reached a failed state; the failure threshold command control over path failures detected by the storage controller; and
,the failure threshold command enables path failure threshold rules to be set up equally for all CHPid, equally for all CHPid that comprise a path group, differently for each CHPid, or a combination based on a number of paths available at a time of a path failure detection. - View Dependent Claims (5, 6, 7)
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8. A data processing system comprising
a host computer, a storage controller; - a plurality of physical paths in communication with the host computer and the storage controller; and
,a system for minimizing performance degradation during communication path failure in a data processing system, the system comprising instructions for; establishing a threshold communication path error rate via a failure threshold command; determining an (i)th actual communication path error rate for an (i)th physical communication path, wherein said (i)th physical communication path is one of said plurality of physical communication paths in communication with said host computer and said storage controller; discontinuing use of said (i)th physical communication path if said (i)th actual communication path error rate is greater than said threshold communication path error rate; and
whereinthe host computer comprises at least one channel path identifier (CHPid); and
,the failure threshold command enables provision of path failure threshold rules to determine when a CHPid has reached a failed state condition; the failure threshold command includes parameters that contain path failure threshold rules; the storage controller uses the path failure threshold rules to determine when a CHPid has reached a failed state; the path failure threshold rules are maintained in a storage controller CHPid information data structure; the failure threshold command control over path failures detected by the storage controller; and
,the failure threshold command enables path failure threshold rules to be set up equally for all CHPid, equally for all CHPid that comprise a path group, differently for each CHPid, or a combination based on a number of paths available at a time of a path failure detection. - View Dependent Claims (9, 10)
- a plurality of physical paths in communication with the host computer and the storage controller; and
Specification
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Current AssigneeInternational Business Machines Corporation
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Original AssigneeInternational Business Machines Corporation
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InventorsHathorn, Roger G., Coronado, Juan A., Holley, Bret W., Valencia, Clarisa
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Primary Examiner(s)Wong; Xavier Szewai
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Application NumberUS12/241,836Publication NumberTime in Patent Office1,022 DaysField of SearchNoneUS Class Current370/241CPC Class CodesG06F 11/0727 in a storage system, e.g. i...G06F 11/076 by exceeding a count or rat...
