Hi Roger,  It seems that ESXi recognized new device size (6.8TB) so the issue is only with VMFS inreasing. Please have a look at VMware KB 1017662 - you can try either to connect to the ESXi host directly (not via vCenter), or maybe try to use the vSphere Web Client - I know that some functionalities are limited/deprecated with ESXi 6.0 and vSphere Client, VMware recommend to use the Web Client instead - so maybe this will help.  Let me know how did it go!  Best, Pawel
This is our current environment: ScaleIO v2.0-6035.0 Windows 2012 r2 datacenter vcenter 6.0.0, 3634793 (4) esxi 6.0.0 3620759 (4) Dell PowerEdge R730xd w\ (4) SSD 750GB + (12) HDD 1.2GB 10k = each disk raid 0. (1) Protection Domain (2) Storage Pools - SSD & HDD10k (4) Fault Sets - each Dell PowerEdge is considered a fault set. (4) SVM\SDS -- Each esxi host has one SVM w\8CPU & 14GB of memory   I have taken a volume within ScaleIO and increased it to 7TB. when I go to the esxi host and try to increase the size nothing appears once I select "increase". I have tried rescanning the host but no luck. [IMAGE]
Extend datastore for esxi host