DNS won't start until all servers running?
Hi, not really sure where to put this and whether I'm worrying unnecisarily but it has me a little concerned with reagrds to what I had planned.
Our power has been off all day today so yesterday I went in and shut all the servers down. Came in late on this afternoon to power everything back up but DNS failed to start until all servers were up and running which had me puzzled.
The Forest is currently in Windows 2000 Mode, the Domain in Windows 2003.
There are 3 DC's at present, 2 2003 and 1 2008 R2, the 2008 R2 being the one which holds all FSMO roles (or should do!) and all servers hold the GC. I started up the 2008 R2 server and even 10 minutes after starting DNS was still waiting for the Initial Syncronisation of AD before it would start.
Started up another DC, which also wouldn't start DNS, then started the 3rd DC at which point the DNS zones could be loaded.
I thought that DNS should be able to load from the 2008 R2 server if all the other servers were down.
Is it likely there is something held by the 3rd DC I started that AD is dependant upon to do it's initial syncronisation, or does AD require all DC's running before an initial syncronisation can occur? If it does require all DC's for the initial synchronisation what happens if a DC fails while it's shut down?
The only reason I'm slightly worried is that I was planning to remove this DC over the next half term to rebuild it with a bigger C Drive, but now I'm concerned that if I remove it and then at some point in the future have to shut all the servers down again I won't be able to bring AD back up.
Any ideas where I should be looking or am I worrying unnecessarily?