CONSOLIDATING SESSION INFORMATION FOR A CLUSTER OF SESSIONS IN A COUPLED SESSION ENVIRONMENT

• US 20100217857A1
• Filed: 05/11/2010
• Published: 08/26/2010
• Est. Priority Date: 02/16/2006
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: McClure, Alan George, Blea, Donald Reynold, Shackelford, David Michael, McBride, Gregory Edward, Crockett, Robert Nelson
• Granted Patent: US 8,626,722 B2
• Time in Patent Office: Days
• US Class Current: 709/223
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066

Abstract

Provided are a method, system, and program for consolidating session information for a cluster of sessions in a coupled session environment. Information for each of a plurality of sessions comprising a cluster is stored in a memory of a processor session. Each session associates at least one primary system and at least one secondary system, wherein within each session, updates are copied from the at least one primary system to the at least one secondary system. The session information in the memory for the plurality of sessions is processed to generate consolidated session information for the cluster based on the session information for the sessions in the cluster. The consolidated session information for the cluster is written to a master data set maintaining information for sessions.

Claims

1. A method, comprising:

storing in a memory of a processor session information for each of a plurality of sessions comprising a cluster, wherein each session associates at least one primary system and at least one secondary system, wherein within each session, updates are copied from the at least one primary system to the at least one secondary system;

processing the session information in the memory for the plurality of sessions to generate consolidated session information for the cluster based on the session information for the sessions in the cluster; and

writing the consolidated session information for the cluster to a master data set maintaining information for sessions.

2. The method of claim 1, further comprising:

writing information on a session not included in the cluster to the master data set, wherein the session not included in the cluster associates at least one primary system and at least one secondary system such that updates are copied from the at least one primary system to the at least one secondary system.

3. The method of claim 2, wherein the processor comprises a first processor, wherein the session not included in the cluster is managed by a second processor, wherein the first processor manages the copying of updates for the sessions in the cluster.

4. The method of claim 1, wherein the cluster comprises a first cluster and wherein the master data set is adapted to include information from additional clusters including sessions managed by additional processors.

5. The method of claim 1, wherein processing the information comprises:

determining a most recent update time for each session indicated in the memory, wherein the consolidated session information comprises a minimum of the determined most recent update times.

6. The method of claim 5, wherein the master data set is adapted to include information from coupled sessions associating at least one primary storage and at least one secondary storage that are managed by additional processors, further comprising:

reading, by the additional processors, the consolidated session information in the master data set to determine the minimum of the most recent update times across all the coupled sessions indicated in the master data set to maintain data consistency across coupled sessions.

7. The method of claim 1, wherein processing the information comprises:

determining a value of an error flag for each session indicated in the memory, wherein generating the consolidated session information comprises performing an OR operation on all the determined error flags, wherein additional processors managing additional sessions fails an update in response to determining that the consolidated error flag indicates an error.

8. The method of claim 1, wherein processing the information comprises:

determining a value of a state flag for each session indicated in the memory, wherein generating the consolidated session information comprises;

performing a first type of operation on the determined values to determine consolidated session information for a first operation; and

performing a second type of operation on the determined values to determine consolidated session information for a second operation.

9. The method of claim 8, wherein the state flag indicates whether the session is consistent with all other sessions represented in the master data set, wherein the first type of operation comprises an OR operation and wherein the second type of operation comprises an AND operation.

10. The method of claim 1, wherein the master data set is adapted to include information from sessions associating at least one primary storage and at least one secondary storage that are managed by additional processors further comprising:

processing, by one processor managing at least one session, the information for each cluster or session not included in a cluster indicated in the master data set to obtain a value providing information on all sessions indicated in the master data set; and

processing the value to determine whether to perform write updates from the primary system to the secondary system.

11. A system in communication with primary systems, secondary systems, and a master data set, comprising:

a processor;

a memory coupled to the processor;

a computer readable medium including code executed by the processor to perform operations, the operations comprising;

storing in the memory session information for each of a plurality of sessions comprising a cluster, wherein each session associates at least one of the primary systems and at least one of the secondary systems, wherein within each session, updates are copied from the at least one primary system to the at least one secondary system associated with the session;

processing the session information in the memory for the plurality of sessions to generate consolidated session information for the cluster based on the session information for the sessions in the cluster; and

writing the consolidated session information for the cluster to the master data set maintaining information for sessions.

12. The system of claim 11, wherein the operations further comprise:

writing information on a session not included in the cluster to the master data set, wherein the session not included in the cluster associates at least one primary system and at least one secondary system such that updates are copied from the at least one primary system to the at least one secondary system.

13. The system of claim 12, wherein the processor comprises a first processor, further comprising:

a second processor, wherein the session not included in the cluster is managed by the second processor, and wherein the first processor manages the copying of updates for the sessions in the cluster.

14. The system of claim 11, wherein the cluster comprises a first cluster and wherein the master data set is adapted to include information from additional clusters including sessions managed by additional processors.

15. The system of claim 11, wherein processing the information comprises:

determining a most recent update time for each session indicated in the memory, wherein the consolidated session information comprises a minimum of the determined most recent update times.

16. The system of claim 15, further comprising:

additional processors, wherein the master data set is adapted to include information from coupled sessions associating at least one primary storage and at least one secondary storage that are managed by additional processors, wherein the additional processors are enabled to perform reading the consolidated session information in the master data set to determine the minimum of the most recent update times across all the coupled sessions indicated in the master data set to maintain data consistency across coupled sessions.

17. The system of claim 11, wherein processing the information comprises:

determining a value of an error flag for each session indicated in the memory, wherein generating the consolidated session information comprises performing an OR operation on all the determined error flags, wherein additional processors managing additional sessions fails an update in response to determining that the consolidated error flag indicates an error.

18. The system of claim 11, wherein processing the information comprises:

determining a value of a state flag for each session indicated in the memory, wherein generating the consolidated session information comprises;

performing a first type of operation on the determined values to determine consolidated session information for a first operation; and

performing a second type of operation on the determined values to determine consolidated session information for a second operation.

19. The system of claim 18, wherein the state flag indicates whether the session is consistent with all other sessions represented in the master data set, wherein the first type of operation comprises an OR operation and wherein the second type of operation comprises an AND operation.

20. The system of claim 11, further comprising:

additional processors, wherein the master data set is adapted to include information from sessions associating at least one primary storage and at least one secondary storage that are managed by the additional processors, wherein one processor managing at least one session is enabled to perform;

processing the information for each cluster or session not included in a cluster indicated in the master data set to obtain a value providing information on all sessions indicated in the master data set; and

processing the value to determine whether to perform write updates from the primary system to the secondary system.

21. An article of manufacture comprising a computer readable storage medium including code executed by a processor having a memory, wherein the code is enabled to cause operations to be performed, the operations comprising:

generating a master data set;

storing in the memory session information for each of a plurality of sessions comprising a cluster, wherein each session associates at least one primary system and at least one secondary system, wherein within each session, updates are copied from the at least one primary system to the at least one secondary system;

processing the session information in the memory for the plurality of sessions to generate consolidated session information for the cluster based on the session information for the sessions in the cluster; and

writing the consolidated session information for the cluster to the master data set maintaining information for sessions.

22. The article of manufacture of claim 21, wherein the operations further comprise:

writing information on a session not included in the cluster to the master data set, wherein the session not included in the cluster associates at least one primary system and at least one secondary system such that updates are copied from the at least one primary system to the at least one secondary system.

23. The article of manufacture of claim 22, wherein the processor comprises a first processor, wherein the article of manufacture further includes code executed by a second processor managing the session not included in the cluster, wherein the first processor manages the copying of updates for the sessions in the cluster.

24. The article of manufacture of claim 21, wherein the cluster comprises a first cluster and wherein the master data set is adapted to include information from additional clusters including sessions managed by additional processors.

25. The article of manufacture of claim 21, wherein processing the information comprises:

determining a most recent update time for each session indicated in the memory, wherein the consolidated session information comprises a minimum of the determined most recent update times.

26. The article of manufacture of claim 25, wherein the master data set is adapted to include information from coupled sessions associating at least one primary storage and at least one secondary storage that are managed by additional processors, wherein the article of manufacture further includes code executed by the additional processors to perform operations comprising:

reading the consolidated session information in the master data set to determine the minimum of the most recent update times across all the coupled sessions indicated in the master data set to maintain data consistency across coupled sessions.

27. The article of manufacture of claim 21, wherein processing the information comprises:

determining a value of an error flag for each session indicated in the memory, wherein generating the consolidated session information comprises performing an OR operation on all the determined error flags, wherein additional processors managing additional sessions fails an update in response to determining that the consolidated error flag indicates an error.

28. The article of manufacture of claim 21, wherein processing the information comprises:

determining a value of a state flag for each session indicated in the memory, wherein generating the consolidated session information comprises;

performing a first type of operation on the determined values to determine consolidated session information for a first operation; and

performing a second type of operation on the determined values to determine consolidated session information for a second operation.

29. The article of manufacture of claim 28, wherein the state flag indicates whether the session is consistent with all other sessions represented in the master data set, wherein the first type of operation comprises an OR operation and wherein the second type of operation comprises an AND operation.

30. The article of manufacture of claim 21, wherein the master data set is adapted to include information from sessions associating at least one primary storage and at least one secondary storage that are managed by additional processors, wherein the article of manufacture further includes code executed by the additional processors to perform operations comprising:

processing, by one processor managing at least one session, the information for each cluster or session not included in a cluster indicated in the master data set to obtain a value providing information on all sessions indicated in the master data set; and

processing the value to determine whether to perform write updates from the primary system to the secondary system.