Windows2008 DC takes time to reboot

We have multiple sites and each site has its domain ctrl . The small sites have one DC at each and the HQ has multiple DCs.
We do regular patch updates and all DCs have consistent updates and are replicating ok.
I noticed the HQ DCs are taking longer time to reboot compare with others.
The HQ DCs have FSMO rolls.
Is there any reason why they take longer time compare with others?
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sara2000Asked:
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Jamie McKillopIT ManagerCommented:
Hello,

On thing to look at is your DNS settings. The primary DNS server specified on the server NIC should be another DC in the same site. The secondary DNS should point to itself.

-JJ
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dan_blagutCommented:
hello

And be sure that the restart procedure allow that always you have one controller running when other are restarting. (best: restart one DC by nigth)

Dan
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Windows Server 2008

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