An atomic write data structure is provided comprising a stripe buffer list descriptor defining state information of a stripe buffer list entry associating a virtual stripe of data storage space with cache data. An associated method is provided comprising constructing metadata associating a virtual stripe of data storage space with cache data; modifying the metadata to reflect state changes related to a pending data transaction between the data storage space and the cache; writing the modified metadata to an atomic write descriptor; and recalling the atomic write descriptor for transacting a selected atomic block size in an event of an interruption while executing the data transaction.