Using track locks and stride group locks to manage cache operations

A computer program product for managing Input/Output requests to a tracks in a cache stored in a plurality of storage devices, the computer program product comprising a computer readable storage medium having computer readable program code embodied therein that when executed by a plurality of processing cores performs operations, the operations comprising:

• granting shared stride locks to writes to tracks in a stride group of tracks, wherein the shared stride locks are granted to writes simultaneously writing to different tracks in the stride group;
• determining whether there are outstanding shared stride locks for writes in response to a destage request to destage the stride groups of tracks;
• and
• granting an exclusive stride lock for a destage of a stride group of tracks from the cache to the storage devices in response to determining there are no outstanding shared stride locks for writes.

A system for managing Input/Output requests to a plurality of storage devices, comprising:

• at least one processor;
• and
• a computer readable storage medium having computer readable program code embodied that when executed by the at least one processor performs operations, the operations comprising:
• storing in cache a group of tracks that are stored in the storage devices;
• granting exclusive track locks for tracks in the group in the cache for writes to the tracks in the group in the cache, wherein exclusive track locks can be simultaneously held for writes to different tracks in the cache;
• granting an exclusive group lock for the group of tracks in the cache to destage the tracks in the group from the cache to the storage devices;
• and
• releasing the exclusive group lock in response to completing the destage of the tracks in the group in the cache to the storage devices.

A system for managing Input/Output requests to a plurality of storage devices, comprising:

• a plurality of processing cores;
• and
• a computer readable storage medium having computer readable program code embodied that when executed by the processing cores performs operations, the operations comprising:
• granting shared stride locks to writes to tracks in a stride group of tracks, wherein the shared stride locks are granted to writes simultaneously writing to different tracks in the stride group;
• determining whether there are outstanding shared stride locks for writes in response to a destage request to destage the stride groups of tracks;
• and
• granting an exclusive stride lock for a destage of a stride group of tracks from the cache to the storage devices in response to determining there are no outstanding shared stride locks for writes.

A method for managing Input/Output requests to a plurality of storage devices, comprising:

• storing in cache a group of tracks that are stored in the storage devices;
• granting exclusive track locks for tracks in the group in the cache for writes to the tracks in the group in the cache, wherein exclusive track locks can be simultaneously held for writes to different tracks in the cache;
• granting an exclusive group lock for the group of tracks in the cache to destage the tracks in the group from the cache to the storage devices;
• and
• releasing the exclusive group lock in response to completing the destage of the tracks in the group in the cache to the storage devices.