On Fri, Jun 07, 2019 at 10:10:11PM +0900, Naohiro Aota wrote: > Direct write I/Os can be directed at existing extents that have already > been written. Such write requests are prohibited on host-managed zoned > block devices. So disable direct IO support for a volume with HMZONED mode > enabled. > That's only if we're nocow, so seems like you only need to disable DIO into nocow regions with hmzoned? Thanks, Josef