vSAN Witness Requirements

[MikeSmarz]

Hi.

I will be really appreciated if You could help me with some case.

I have a 3 node vSAN cluster that run on 8.0.3

The FTT is RAID 0/FTT0.

I would like to use RAID 1/FTT1.

Should I deploy a vSAN witness to act as the 3rd host and allow us to use RAID1 policy?

[TWBudrys · Accepted solution]

At the begining You should check CPU compability

[TheBobkin · Accepted solution]

@MikeSmarz If it is a 3-node cluster and all nodes have Disk-Groups/Storage-Pools then that is sufficient for creating RAID1,FTT=1 objects already and doesn't require any additional node or Witness.

[depping · Accepted solution]

Also, a witness only works with:

• A two-node cluster
• A stretched cluster

As mentioned by thebobkin, 3 nodes is sufficient for R1. And sufficient for R5 with vSAN ESA.

[TWBudrys · Accepted solution]

That is a very valuable information @MikeSmarz Note that 🙂

[amohammadimir · Accepted solution]

I suggest you to read this:

https://core.vmware.com/resource/vmware-vsan-design-guide

[TWBudrys]

So good luck @MikeSmarz