Deferred resource recovery

• US 5,386,551 A
• Filed: 04/16/1993
• Issued: 01/31/1995
• Est. Priority Date: 04/16/1993
• Status: Expired due to Term

• Current Assignee: Storage Technologies Corporation (Oracle Corporation)
• Original Assignee: Storage Technologies Corporation (Oracle Corporation)
• Inventors: Chikira, JoEtta S., Hill, Fletcher L., Jurestovsky, Nancy R.
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): Decady, Albert
• Application Number:
  US08/049,029
• Time in Patent Office: 655 Days
• Field of Search: 395/575, 395/650, 371/29.1, 371/21.1, 371/7, 371/8.1, 364/230.3, 364/246.3, 364/246.8
• US Class Current: 714/46
• CPC Class Codes: G06F 11/1402 Saving, restoring, recovering or retrying
• CPC Class Codes: G06F 11/16 Error detection or correction of the data by redundancy in hardware
• CPC Class Codes: G06F 11/22 Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing

Abstract

The resource management system first fences all autonomous resources, then shared resources required for a first activity. The first activity is then executed and the domain for the next activity examined to identify common fencing requirements. If the shared resource fencing is unaltered between successive activities, then to resource modification is required and the second activity is immediately executed. Otherwise, the shared resources of the first activity are returned to functional use and the shared resources required for the second activity are then fenced. Release of the autonomous resources is deferred to enable the immediate execution of the second activity. Once the last activity in the work stream is completed, all fencing is removed and all resources returned to functional use.

Claims

1. Apparatus in a customer system, which performs customer operations, which customer system includes a plurality of redundant operational elements, each interconnected to at least one other operational element via an interconnection path, for controllably isolating operational elements in said customer system to perform a non-customer. operation concurrently with the execution of customer operations in said customer system, comprising:

means for storing data identifying said operational elements and said interconnection paths in said customer system;

means, responsive to receipt of a request to execute a non-customer operation, for retrieving a portion of said data from said storing means to identify a set of said operational elements and said interconnection paths connected to said set of operational elements that are required to execute said non-customer operation comprising;

means responsive to receipt of said request to execute said non-customer operation for mapping said requested non-customer operation into a series of operational sequences of customer system operation that correspond to said requested non-customer operation;

means for selectively disabling the use of said set of operational elements, as identified by said retrieving means, by said customer system for customer operations;

means for executing said non-customer operation concurrently with customer operations, using said set of operational elements;

means, responsive to completion of said non-customer operation, for restoring said set of operational elements to an idle state; and

means for enabling the use of said set of operational elements by said customer system for customer operations.

2. The apparatus of claim 1 wherein said plurality of operational elements comprise a predetermined number of types of elements, said retrieving means comprises:

means for translating each said operational sequence that corresponds to said requested non-customer operation into a definition of a subset of said types of elements required to implement said non-customer operation; and

means for selecting a one of said operational elements in each type defined in said subset.

3. Apparatus in a customer system, which performs customer operations, which system includes a plurality of redundant operational elements, each interconnected to at least one other operational element via an interconnection path, for controllably isolating operational elements in said customer system to perform a non-customer operation concurrently with the execution of customer operations in said customer system, comprising:

means for storing said operational elements and said interconnection paths in said customer system;

means, responsive to receipt of a request to execute a non-customer operation, for retrieving a portion of said data from said storing means to identify a set of said operational elements and said interconnection paths connected to said set of operational elements that are required to execute said non-customer operation, comprising;

means for translating said non-customer operation into a definition of a subset of said types of elements required to implement said non-customer operation; and

means for selecting a one of said operational elements in each type defined in said subset;

means for selectively disabling the use of said set of operational elements, as identified by said retrieving means, by said customer system for customer operations;

means for executing said non-customer operation concurrently with customer operations, using said set of operational elements;

means, responsive to completion of said non-customer operation, for restoring said set of operational elements to an idle state; and

means for enabling the use of said set of operational elements by said customer system for customer operations.

4. The apparatus of claim 3 wherein said retrieving means further comprises:

means for verifying that selection of a one of said operational elements in each type defined in said subset does not reduce the number of said operational elements in each type defined in said subset below a predetermined minimum number.

5. The apparatus of claim 3 wherein said retrieving means further comprises:

means for verifying that at least one of said operational elements exists in said customer system for each type defined in said subset.

6. The apparatus of claim 3 wherein said retrieving means further comprises:

means, responsive to data contained in said non-customer operation request identifying specific operational elements, for assigning said identified specific operational elements to said corresponding types in said subset.

7. The apparatus of claim 3 wherein said storing means stores data indicative of the autonomous and shared resource nature of said operational elements, said retrieving means further comprises:

means, responsive to receipt of a plurality of non-customer operation requests, for queuing said plurality of requests;

means for examining said plurality of queued requests to identify types of autonomous operational elements common to at least two of said plurality of queued requests; and

wherein said selecting means assigns a single autonomous operational element to said common type in said at least two queued requests.

8. The apparatus of claim 7 wherein said retrieving means further comprises:

means for queuing said non-customer operations by common single autonomous operational element.

9. The apparatus of claim 3 wherein said selective disabling means comprises:

means for verifying that each selected operational element in each type defined in said set is not in use;

means, responsive to said set of operational elements not being in use, for identifying all said interconnection paths connected to said set of operational elements; and

means for writing data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements into a memory to prevent customer operations from selecting any of said identified set of operational elements.

10. The apparatus of claim 9 wherein said restoring means comprises:

means for verifying that each selected operational element in each type defined in said set is not in use;

means, responsive to said set of operational elements not being in use, for identifying all said interconnection paths connected to said set of operational elements; and

means for deleting data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements from said memory to enable customer operations from selecting any of said identified set of operational elements.

11. The apparatus of claim 10 further comprising:

means for suspending non-customer operation by temporarily erasing said written data from said memory that identifies at least one selected operational element to enable said customer operations to utilize said at least one operational element.

12. The apparatus of claim 3 wherein said storing means stores data indicative of the autonomous and shared resource nature of said operational elements, said selectively disabling means comprises:

means for discontinuing customer operations in each autonomous element of said set of operational elements;

means for discontinuing customer operations in each shared element of said set of operational elements;

means, responsive to said set of operational elements not being in use, for identifying all said interconnection paths connected to said set of operational elements; and

means for writing data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements into a memory to prevent customer operations from selecting any of said identified set of operational elements.

13. The apparatus of claim 12 wherein said restoring means comprises:

means for verifying that each selected operational element in each type defined in said set is not in use;

means, responsive to said set of operational elements not being in use, for identifying all said interconnection paths connected to said set of operational elements; and

means for deleting data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements from said memory to enable customer operations from selecting any of said identified set of operational elements.

14. The apparatus of claim 12 further comprising:

means for suspending non-customer operation by temporarily erasing said written data from said memory that identifies at least one selected operational element to enable said customer operations to utilize said at least one operational element.

15. A method in a customer system, which performs customer operations, which customer system includes a plurality of redundant operational elements, each interconnected to at least one other operational element via an interconnection path, for controllably isolating operational elements in said customer system to perform a non-customer operation concurrently with the execution of customer operations in said customer system, comprising the steps of:

storing in a resource memory data identifying said operational elements and said interconnection paths in said customer system;

retrieving, in response to receipt of a request to execute a non-customer operation, a portion of said data from said resource memory to identify a set of said operational elements and said interconnection paths connected to said set of operational elements that are required to execute said non-customer operation, comprising;

mapping, in response to receipt of said request to execute said non-customer operation, said requested non-customer operation into a series of operational sequences of customer system operation that correspond to said requested non-customer operation;

selectively disabling the use of said set of operational elements, as identified by said step of retrieving, by said customer system for customer operations;

executing said non-customer operation concurrently with customer operations, using said set of operational elements;

restoring, in response to completion of said non-customer operation, said set of operational elements to an idle state; and

enabling the use of said set of operational elements by said customer system for customer operations.

16. The method of claim 15 wherein said plurality of operational elements comprise a predetermined number of types of elements, said step of retrieving comprises:

translating each said operational sequence that corresponds to said requested non-customer operation into a definition of a subset of said types of elements required to implement said non-customer operation; and

selecting a one of said operational elements in each type defined in said subset.

17. A method in a customer system, which performs customer operations, which customer system includes a plurality of redundant operational elements, each interconnected to at least one other operational element via an interconnection path, for controllably isolation operational element in said customer system to perform a non-customer operation concurrently with the execution of customer operations in said customer system, comprising the steps of;

storing in a resource memory data identifying said operational elements and said interconnection paths in said customer system;

retrieving, in response to receipt of a request to execute a non-customer operation, a portion of said data from said resource memory to identify a set of said operational elements and said interconnection paths connected to said set of operational element that are required to execute said non-customer operation, comprising;

translating said non-customer operation into a definition of a subset of said types of elements required to implement said non-customer operation; and

selecting a one of said operational elements in each type defined in said subset;

selectively disabling the use of said set of operational elements, as identified by said step of retrieving, by said customer system for customer operations;

executing said non-customer operation concurrently with customer operations, using said set of operational elements;

restoring, in response to completion of said non-customer operation, said set of operational elements to an idle state; and

enabling the use of said set of operational elements by said customer system for customer operations.

18. The method of claim 17 wherein said step of retrieving further comprises:

verifying that selection of a one of said operational elements in each type defined in said subset does not reduce the number of said operational elements in each type defined in said subset below a predetermined minimum number.

19. The method of claim 17 wherein said step of retrieving further comprises:

verifying that at least one of said operational elements exists in said customer system for each type defined in said subset.

20. The method of claim 17 wherein said step of retrieving further comprises:

assigning, in response to data contained in said non-customer operation request identifying specific operational elements, said identified specific operational elements to said corresponding types in said subset.

21. The method of claim 17 wherein said resource memory stores data indicative of the autonomous and shared resource nature of said operational elements, said step of retrieving further comprises:

queuing, in response to receipt of a plurality of non-customer operation requests, said plurality of requests;

examining said plurality of queued requests to identify types of autonomous operational elements common to at least two of said plurality of queued requests; and

wherein said step of selecting assigns a single autonomous operational element to said common type in said at least two queued requests.

22. The method of claim 21 wherein said step of retrieving further comprises:

queuing said non-customer operations by common single autonomous operational element.

23. The method of claim 17 wherein said step of selective disabling comprises:

verifying that each selected operational element in each type defined in said set is not in use;

identifying, in response to said set of operational elements not being in use, all said interconnection paths connected to said set of operational elements; and

writing data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements into a memory to prevent customer operations from selecting any of said identified set of operational elements.

24. The method of claim 23 wherein said step of restoring comprises:

verifying that each selected operational element in each type defined in said set is not in use;

identifying, in response to said set of operational elements not being in use, all said interconnection paths connected to said set of operational elements; and

deleting data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements from said memory to enable customer operations from selecting any of said identified set of operational elements.

25. The method of claim 23 further comprising:

suspending non-customer operation by temporarily erasing said written data from said memory that identifies at least one selected operational element to enable said customer operations to utilize said at least one operational element.

26. The method of claim 17 wherein said resource memory stores data indicative of the autonomous and shared resource nature of said operational elements, said step of selectively disabling comprises:

discontinuing customer operations in each autonomous element of said set of operational elements;

discontinuing customer operations in each shared element of said set of operational elements;

identifying, in response to said set of operational elements not being in use, all said interconnection paths connected to said set of operational elements; and

writing data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements into a memory to prevent customer operations from selecting any of said identified set of operational elements.

27. The method of claim 26 wherein said step of restoring comprises:

verifying that each selected operational element in each type defined in said set is not in use;

identifying, in response to said set of operational elements not being in use, all said interconnection paths connected to said set of operational elements; and

deleting data identifying said set of operational elements and said identified interconnection paths connected to said set of operational elements from said memory to enable customer operations from selecting any of said identified set of operational elements.

28. The method of claim 26 further comprising:

suspending non-customer operation by temporarily erasing said written data from said memory that identifies at least one selected operational element to enable said customer operations to utilize said at least one operational element.