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I have a network with one domain controller and 2 NAS-servers (running on a built-in Linux OS). Permissions to the files on the NAS servers are handled through AD rights. I want to bring the DC down for a short while (up to half an hour) and need to know if people who already are accessing the NAS-servers are still able to do that while the DC is down (as long as they don't logoff, reboot etc their machines).

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up vote 2 down vote accepted

As long as the NAS is using Kerberos, you should probably be fine. You can use klist to see what Kerberos tickets specific clients have. This includes expiration time. It should give you a rough idea of how long you generally have.

That said, only having 1 DC is dangerous. You should always have a minimum of two. In addition to mitigating the danger of a failure, it also would make situations like this go away.

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Thanks for reminding me for of the Kerboros expiration time. Completely forgot about that. A second DC is not in the cards, alas. –  Erwin Blonk Nov 13 '12 at 11:54

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