On Sat, 2017-09-16 at 07:35 +0900, Damien Le Moal wrote: > rw16 is mandatory for ZBC drives. So it has to be set to true. If the > HBA does not support rw16 (why would that happen ?), then the disk > should not be used. It's good that all HBAs support rw16. But it's nontrivial to analyze whether or not use_1[06]_for_rw are set before these are used so maybe we should think about how we can restructure the SCSI code such that it becomes easier to verify that use_1[06]_for_rw are set before these are used. Bart.