Well , you should refer the IPD - Active Directory Domain Services from Microsoft, to understand the number of DCs require. I have attached the files for you. Refer them to clarify your doubts.
As stated by @Amit, keep at least 2DCs in each site provided they should be powerful enough. I do keep 3 in each site, since I have a lots of AD integrated applications running in the net work + all of them are GCs too.
we have 2 new physical servers act as DC i will connect to one of them and change the operation master . i will change the RID - PDC - infrastructure to one of them and this server will the primary one . then i can remove the rest normal using dcprmo right ?
then i will get no effect ?
Amit Kumar
That is fine if you keep Domain Name master and Schema master on one server and rest FSMO role son another server.
you can remove using DCpromo without any issue, just keep checking replication time to time and I would suggest demote one DC only within 24-48 hours to see if there is any impact.
As stated by @Amit, keep at least 2DCs in each site provided they should be powerful enough. I do keep 3 in each site, since I have a lots of AD integrated applications running in the net work + all of them are GCs too.
Zac.