Hello, Team.
Is anyone know if it's possible uses vSAN Stretched Cluster with 4 nodes being 2 nodes on each site? I believe that it's not possible or if it's possible there is a necessity to use additional vSAN witnesses on each data site (to be compliant with vSAN RAID1) beyond the vSAN Witness between de data sites.
Regards.
no
its one dedicated witness host per stretch cluster
if you go with 2+2+1 you will be able to implement raid-1 acorss the stretch cluster, but no local redundancy
if you want secondary faiiures to tolerate , which gives you local redundancy as well as site level protection you need 3 hosts per site
i.e. 3+3 + 1
In all cases you need one witness host per cluster, and hosted in a 3rd site
its all outlined in the doc I shared
https://core.vmware.com/resource/vsan-stretched-cluster-guide#sec7306-sub2
in your scenario you can use 2 + 2 + 1 for stretch cluster, meaning you need an additional a witness host which can be a ESXi virtual applance or a physcial host
You need 3 sites to implement a witness
That means 2 hosts are part of one Fault Domain on one Site, the other two hosts would need to be on the second site Site
A 3d site then is needed to host the witness appliance
have a read off this guide https://core.vmware.com/resource/vsan-stretched-cluster-guide#section1
Hello Paudieo.
You say that is necessary uses additional witness for each fault domain in order to be compliant with RAID1 police? Beyond the vSAN Stretched Cluster Witness in the thrid site?
no
its one dedicated witness host per stretch cluster
if you go with 2+2+1 you will be able to implement raid-1 acorss the stretch cluster, but no local redundancy
if you want secondary faiiures to tolerate , which gives you local redundancy as well as site level protection you need 3 hosts per site
i.e. 3+3 + 1
In all cases you need one witness host per cluster, and hosted in a 3rd site
its all outlined in the doc I shared
https://core.vmware.com/resource/vsan-stretched-cluster-guide#sec7306-sub2