The support for all-flash VSAN is perhaps the most significant enhancement on the previous generation of VSAN. This implies that we now have the following two types of disk group compositions for Virtual SAN:
Hybrid VSAN
All-flash VSAN
The VMware compatibility matrix has a field added to include whether the specific I/O controllers support the all-flash mode or the hybrid mode, or both.
Similarly, SSD devices include support explicitly if the device is suited and certified for the all-flash caching tier, the all-flash capacity tier, and the hybrid caching tier.
The following two screenshots reflect this change in the VMware compatibility list available at http://www.vmware.com/resources/compatibility/search.php?deviceCategory=vsan:
I/O controller compatibility
In the following screenshot, we can observe an example of SSD suited for VSAN all-flash caching, as well as VSAN hybrid caching:
SSD compatibility
In the following screenshot, we can observe an SSD device that can only...