Data object recovery for storage systems

A system comprising:

• one or more processors;
• a volatile memory;
• and
• a non-volatile memory storing computer program code that when executed on the processor causes execution across the one or more processors of a process operable to perform the operations of:
• receiving an I/O request for object data;
• determining one or more data fragments wherein the object data is stored;
• determining that one or more of the data fragments are unavailable;
• determining, from within the one or more unavailable data fragments, a set of slices storing the object data, each slice comprising k small data fragments and m coded fragments;
• for each slice, retrieving at least k small data and coded fragments within the slice from storage;
• and
• recovering a segment of the object data using the retrieved small data and coded fragments.

A computer program product tangibly embodied in a non-transitory computer-readable medium, the computer-readable medium storing program instructions that are executable to:

• receive an I/O request for object data;
• determine one or more data fragments wherein the object data is stored;
• determine that one or more of the data fragments are unavailable;
• determine, from within the one or more unavailable data fragments, a set of slices storing the object data, each slice comprising k small data fragments and m coded fragments;
• for each slice, retrieve at least k small data and coded fragments within the slice from storage;
• and
• recover a segment of the object data using the retrieved small data and coded fragments.