Replace DNS role on Server 2003 to Server 2012
We have 1 DNS role running on Server 2003. This server, along with another running Server 2003 R2 is being replaced by a beastly Dell running Server 2012.
As it stands, our DNS looks very messy on the Server 2003 box. There are well over a thousand records and we have less than 500 computers. I can clearly see the same IP address on multiple host records. Tried to resolve this in the past with DNS Scavenging but to no success.
Despite this messy looking setup, everything seems to work perfectly well.
In an ideal world, I would rather just disable DNS on Server 2003, install the DNS role on Server 2012, change DHCP settings, etc go round the school logging on all the computers to test they are updating their records then remove the DNS role from the old server.
I think this is what I did last time (5 years ago) but just checking, is this an ok way of doing it?
I really don't want to migrate because like I said, it's a mess but will this method be ok?
The DNS Server also runs DHCP and is the Schema master. We are basically replacing 2 IMB servers which share all the roles with 1 Dell. We already have another Server 2012 DC on the network so the forst update has been done.
Thanks in advance for any advice/suggestions, etc.