Hi I have a requirement for a VSAN Solution for which i need your help in validating the solution.
Customer has a ROBO with 17 VM's with it and we may size the same with 3 Host including the Witness
License which we are planning to have on this requirement
VSAN HCI KIt ROBO Advance that includes vSphere ROBO Advanced and vSAN ROBO Advanced
Can these two license together provide me the Functionality of FTT R5/6 in case 1 Physical Server Fails.
For RAID-5, a minimum of 4 hosts are required; for RAID-6, a minimum of 6 hosts are required.
You can read about vSAN architecture here: http://it-pilot.ru/2018/07/04/architecture-2-node-vsan-6-6-licensing-vsan-robo/
As @IT_pilot stated - you won't be able to use RAID5 for FTT=1 here as you only have 3 nodes, only RAID1. Additionally RAID5/6 requires All-Flash configuration. Is there a particular reason you are considering using ROBO licensing as opposed to normal vSAN Standard/Advanced/Enterprise licensing? From speaking with people that have compared cost of these, ROBO seems to work out as more expensive (though by all means do assess and compare the costs of these yourself as this may vary).
Also, there is no such thing as "vSAN ROBO Advanced vCenter Foundations" - this is just vCenter Foundations.