Server 2008 Domain - Active Directory issues/question

I have a MS 2008 Domain with two servers that are domain controllers and Global Catalog servers.  When the primary server (also an exchange server) goes down for maintenance, workstations that reboot during that time can log in however they cannot access network resources such as network shares.  The primary server is also the DHCP server for the network and those rebooted workstations don't get a valid ip address upon reboot even though the lease time is set to two weeks.  

     I expected the 2nd server to step up and become the active directory server while the first one is down but that doesn't seem to be happening.  I also thought the rebooted system should retain the leased ip address until the lease has expired but that doesn't seem to be true either.  What am I missing or do I need to do to correct the issues?

     I'm considering moving DHCP to the router to correct the DHCP issue since it's seldom if ever down.

Thanks
kbollerAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You can use a split scope DHCP config where you allocate half (or so) of the addresses to a DHCP server on DC1 and the other half to DC2.  If either DC is down, the other handles the DHCP requests.  If one ever runs out of addresses, the other handles the requests.  (You can also shorten the lease time - 8 hours should be fine).
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it_saigeDeveloperCommented:
Check for FRS related errors in the event log.  It sounds as if your second server never finished the promotion process.

As for DHCP, I think you misunderstand how the process works.  The workstation does not retain the lease, the server does.  The workstation has to ask the server for an ip address every time the workstation restarts.

-saige-
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efrimpolCommented:
In my domain, I actually have a third server that has the DHCP role. I have never had a problem when either DC is down so far.

I used to have this role on one of the DCs and would experience the same situation. Haven't had the problem since removing this role from the DC.
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OnlineSupportCommented:
Exacly what Lee W, MVP says, use a split scope, You get redundancy then, unlike if you change it to your router.
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kbollerAuthor Commented:
Thanks for the help, I'll make the change this weekend.
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