This behavior is currently bug 15489456.
Can you describe the usage of this volume?
Are you using the zvol device directly like this /dev/zvol/[r]dsk/pool/vol-name rather than creating a volume
and using it like this pool/vol-name? Volumes are intended to be used as pool/vol-name.
Thanks for response, its all new created zvol (raw) volume part of new project, yes I created all direct raw volume call zvol - firstly create a pool around 300GB then part of that I created more the 50 zvolumes within different sizes with simple - zfs create -V 2000M pool/vol and its become /dev/zvol/rsdk/pool/vol for user to use. but here issue with permission & ownership - first time I given proper but after reboot hosts or export/import all zvolumes become default as root:root that i don't want - i want just how to change or grant the permission and ownership for this zvolumes?