VMware vSAN is actually a hardware-vendor agnostic, storage agnostic solution. It is not a Hypervisor Agnostic solution as It is fully optimized and customized for VMware ESXi. vSAN is embeded into the ESXi kernel and hence a very good solution if vSphere customers are looking for performance.
What do you mean by vSAN being hardware-vendor agnostic and storage agnostic?
-> It means you can choose the hardware vendor and storage devices as per your wish from a list of VMware vSAN certified hardware. VMware certifies the hardware vendor and its storage devices for vSAN.
VMware vSAN compatibility guide - VMware Compatibility Guide - vsan
VMware vSAN ready nodes - http://www.vmware.com/resources/compatibility/pdf/vi_vsan_rn_guide.pdf
What is "Hypervisor Agnostic" SDS?
-> The software defined solution which can host the data from applications and workload operating under multiple hypervisors.
In my opinion, the word "Hypervisor Agnostic" is just a fancy way to say - "not optimized for any hypervisor" which means the Hypervisor Agnostic solution is not 100% customized and optimized to work with a one specific Hypervisor.
I believe the most value for a customer is to use a Solution which is optimized and customized to work with the existing infrastructure. Hence for vSphere customers, VMware vSAN is the most right solution for Software Defined Storage as It is 100 percent optimized and customized for VMware ESXi.
At the end of the day it is up to the customer to decide which is best for them as each has pros and cons. This is how I look at the data storage solutions:
A. Hardware array (i.e. EMC VMAX/VNX or HDS VSP/HUS)
B. Hyper-converged stack (i.e. VxRail or Nutanix)
C. Software-defined Hypervisor based virtual SAN (i.e. VMware vSAN)
D. Software-defined OS/Hypervisor agnostic virtual SAN (i.e. EMC ScaleIO)
Small info about VxRail vs Nutanix vs HPE
VxRail solution (based on VMware vSAN) is the industry’s only hyper-converged solution featuring kernel layer integration between VMware Virtual SAN and the vSphere hypervisor, delivering unique and unmatched performance and efficiency.
Nutanix and HPE solutions are not integrated into the kernel.
Here is a small post that you may like to read - EMC’s ScaleIO vs VMWare’s VSAN | One Guy in IT
Hope this is helpful.
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Cheers!
-Shivam