This message was posted on behalf of Intel Corporation
Thanks very much for joining the community.
As you correctly stated the latest VMware driver release for this S2600CP2 board published by Intel is for ESXi 4. Intel has stopped publishing VMware drivers and now customers need to locate the drivers from the VMware website directly. This to avoid compatibility issues.
The most recent driver available for this board from the VMware website is for ESXi 6.0 update 3. You can check this on the following URL:
Besides that take into consideration that ESXi doesn't support software RAID so most likely the RAID volume won't show up during the OS installation.
Hope this helps