Welcome to the Community,
in order to help, it's necessary to know your setup, so please provide some details.
Am I right in assuming that it is block storage?
- which storage system (model, firmware) is in use?
- how are the LUNs configured (thin, thick)?
- which ESXi version/build do you use?
- which VMFS version do you use for the datastores (VMFS5, or VMFS6)?
we are using EMC Storage VNXE3200 system with thin LUNs configuration , VMware ESXi version is 6.0.0 and datastores type is NFS