Are you a vSAN 6.x customer? vSphere 6.0 Update 3 is out! There are a bunch of important fixes and improvements (checksumming performance for instance) in Update 3, so I would highly recommend looking in to it and testing it out.
- vSAN Details: https://kb.vmware.com/kb/2149127
- vCenter Server download: https://my.vmware.com/web/vmware/details?downloadGroup=VC60U3&productId=491&rPId=14487
- ESXi download: https://my.vmware.com/web/vmware/details?downloadGroup=ESXI60U3&productId=491&rPId=14487