* For read-only workloads, the program cannot be certain of the
* last numberio written to a block. Checking of numberio will be
* done only for workloads that write data. For verify_only,
* For read-only workloads, the program cannot be certain of the
* last numberio written to a block. Checking of numberio will be
* done only for workloads that write data. For verify_only,