>>>>> "Doug" == Douglas Gilbert <dgilbert@xxxxxxxxxxxx> writes: Doug> And if both are supported by the logical unit, the patch prefers Doug> UNMAP? Yes. SBC states that if the device reports MAXIMUM UNMAP LBA COUNT > 1 and MAXIMUM UNMAP DESCRIPTOR COUNT > 1 then the device supports UNMAP. And in that case that's what I'll issue. In all other cases I'll send out WRITE SAME(16). I believe that approach is what's currently considered best practice. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html