Good day !
Please find the answers:
I guess,without adding this rule,"Object space reservation to zero" in storage policy, all the VMs should be created as a thin provisioning. Am i right?
Yes this is correct. By default it would be thin for any VMs provisioned newly on vSAN.
All the VMs(Windows/Linux VMs) are listed as "thin provisioning",however NSX/vrops(created from OVA) are listed as "thick provisioning lazy zeroed"( i checked from both HTML & flash web client).Is this known bug? Please suggest.
Yes, this is a known issue. Please refer the below KB to get the VMDKs converted from thick to thin. Applies to 6.7 as well.
Thanks so much for your response.