Managing a cache in a multi-node virtual tape controller

摘要

A method according to one embodiment includes outputting a first alert when a cache free space size is less than a first threshold and entering into a warning state, and outputting a second alert when the cache free space size is less than a second threshold and entering into a critical state. At least one scratch volume is deleted when in the critical state, the scratch volume chosen based on at least one of: a length of time the scratch volume has been designated scratch, a priority level of the information stored on the scratch volume, and a scratch delay value associated with the scratch volume.

主权项

1. A computer program product for managing cache space, the computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a controller to cause the controller to perform a method comprising:
storing data received from at least one host to a cache; outputting a first alert when a cache free space size is less than a first threshold and entering into a warning state; outputting a second alert when the cache free space size is less than a second threshold and entering into a critical state; allowing previously mounted virtual drives to continue normal writing activity when in the critical state; and deleting at least one scratch volume when in the critical state, the scratch volume being chosen based on at least one of: a length of time the scratch volume has been designated scratch, a priority level of information stored on the scratch volume, and a scratch delay value associated with the scratch volume.