Handling metadata corruption to avoid data unavailability

Data storage equipment, comprising:

• memory;
• and
• control circuitry coupled to the memory, the memory storing instructions which, when carried out by the control circuitry, cause the control circuitry to:
• perform metadata evaluation operations on metadata describing pages of written data in a data-log that holds data en route to volumes in secondary storage,
• while results of the metadata evaluation operations indicate that there is no corrupt metadata, flush the pages of written data from the data-log to the volumes in the secondary storage, and
• in response to a result of a particular metadata evaluation operation indicating that metadata for a particular page of written data in the data-log is corrupt, quarantine the particular page of written data from the data-log to a containment cache to enable further flushing of other pages of written data from the data-log to the volumes in the secondary storage.

A computer program product having a non-transitory computer readable medium which stores a set of instructions to handle metadata corruption to avoid data unavailability;

• the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of:
• performing metadata evaluation operations on metadata describing pages of written data in a data-log that holds data en route to volumes in secondary storage;
• while results of the metadata evaluation operations indicate that there is no corrupt metadata, flushing the pages of written data from the data-log to the volumes in the secondary storage;
• and
• in response to a result of a particular metadata evaluation operation indicating that metadata for a particular page of written data in the data-log is corrupt, quarantining the particular page of written data from the data-log to a containment cache to enable further flushing of other pages of written data from the data-log to the volumes in the secondary storage.