Sharing private space among data storage system data rebuild and data deduplication components to minimize private space overhead

A data storage system, comprising:

• at least one storage drive;
• a memory;
• and
• storage processing circuitry configured to execute a computer program out of the memory:
• to determine a first amount of private storage space for use by a data rebuild component of a data storage system;
• to determine a second amount of private storage space for use by a file system checking (FSCK) component of the data storage system;
• to determine a third amount of private storage space for use by a data deduplication component of the data storage system;
• to determine a sum of (i) the first amount of private storage space determined for use by the data rebuild component and (ii) a maximum of (a) the second amount of private storage space determined for use by the FSCK component and (b) the third amount of private storage space determined for use by the data deduplication component;
• to allocate, in the data storage system, an amount of private storage space equal to the determined sum;
• and
• to share the allocated amount of private storage space among the data rebuild component, the FSCK component, and the data deduplication component of the data storage system.

A computer program product including a set of non-transitory, computer-readable media having instructions that, when executed by processing circuitry of a computerized apparatus, cause the processing circuitry to perform a method of sharing private storage space among storage system components of a data storage system, the method comprising:

• determining a first amount of private storage space for use by a data rebuild component of a data storage system;
• determining a second amount of private storage space for use by a file system checking (FSCK) component of the data storage system;
• determining a third amount of private storage space for use by a data deduplication component of the data storage system;
• determining a sum of (i) the first amount of private storage space determined for use by the data rebuild component and (ii) a maximum of (a) the second amount of private storage space determined for use by the FSCK component and (b) the third amount of private storage space determined for use by the data deduplication component;
• allocating, in the data storage system, an amount of private storage space equal to the determined sum;
• and
• sharing the allocated amount of private storage space among the data rebuild component, the FSCK component, and the data deduplication component of the data storage system.