Improving data availability during failure detection and recovery processing in a shared resource system

A method of registering pages in a data management system, the method comprising:

• registering a first plurality of pages on a primary coherency processing unit operable to coordinate activities of a plurality of data processing hosts;
• selectively registering a second plurality of pages among the first plurality of pages on a standby coherency processing unit in response to a failure of the primary coherency processing unit;
• and
• at least one of purging and invalidating the first plurality of pages not selectively registered on the standby coherency processing unit,
• wherein the standby coherency processing unit is operable to coordinate the activities of the plurality of data processing hosts by using the selectively registered second plurality of pages in response to the failure of the primary coherency processing unit.

A method of managing shared resources, the method comprising:

• processing lock requests from a plurality of data processing hosts using a primary coherency processing unit and a standby coherency processing unit;
• storing a first current lock state information for the plurality of data processing hosts on the primary coherency processing unit;
• storing a second lock state information on the standby coherency processing unit, the second lock state information including a subset of locks included in the first current lock state information, the standby coherency processing unit configured to perform a plurality of activities of the primary coherency processing unit using the subset of locks in response to a failure of the primary coherency processing unit,
• wherein fewer locks are included in the second lock state information compared to the first lock state information.

A computer program product for managing shared resources, the computer program product comprising:

• a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising:
• computer readable program code configured to enable a computer to perform a method comprising:
• processing lock requests from a plurality of data processing hosts using a primary coherency processing unit and a standby coherency processing unit;
• storing a first current lock state information for the plurality of data processing hosts on the primary coherency processing unit;
• storing a second lock state information on the standby coherency processing unit, the second lock state information including a subset of locks included in the first current lock state information, the standby coherency processing unit configured to perform a plurality of activities of the primary coherency processing unit using the subset of locks in response to a failure of the primary coherency processing unit,
• wherein fewer locks are included in the first current lock state information compared to the second lock state information.