Imagine a standard setup with an Active Directory Server, 4 Exchange servers ( 2 with CAS roles, and two with Mailbox roles) with load balancing and failover.
This site talking about how putting the witness on the Domain Controller is bad practice.
Question:
(If that is actually true) Then where should it go and why? (Knowing fully well that it should not be on a CAS or MB server)
Quote:
Section on the site mentioning this, and they go into depth as to why it's not good practice.
Obligatory disclaimer: While this is definitely not recommended
practise in a production environment, and may have undesirable
results, it will probably work. I highly doubt Microsoft support this,
though I have been unable to find any concrete evidence on it
(frankly, it’s such terrible practise they shouldn’t have to publicise
advice against it).
Best Answer
We typically use Exchange HUB as a File Share Witness server. Here are MS's recommendations
Source: Managing database availability groups
https://technet.microsoft.com/en-us/library/dd298065%28v=exchg.150%29.aspx
Applies to: Exchange Server 2013
EDIT: My mistake, the reference on using the Hub for FSW was from 2007/2010 rather than 2013. Exchange 2013 made an architectural change to exchange roles