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Running a defrag on ntds.dit

Posted on 2013-06-14
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Last Modified: 2013-06-20
I had a question running a defrag on ntds.dit. We currently have 2 domain controllers but are experiencing a weird problem. There is a delay in Active Directory Users and Computers. It seems to be intermittent but sometimes you will be browsing around and get hour glasses when click on objects or OU's. This happens even logged into the local server. I'm at a loss of what it could be and thought I may take a crack at running a defrag on the ntds.dit files. I had a question about the domain controllers. We have 2. AD1 and AD2, is it best practice to take them offline one at a time and run the defrag on each? Since the ntds.dit file is not located in sysvol or netlogon I did not think they were replicated between the two dc's. Any advice or suggestions is greatly appreciated. Thank you
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Question by:Abacus IT
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Mike Kline earned 500 total points
ID: 39248556
Online defrag already happens every 12 hours   http://support.microsoft.com/kb/198793   all the offline defrag will do is reclaim space which is probably not that much in your environment.

Have you run perfmon or SPA   http://blogs.technet.com/b/askds/archive/2010/06/08/son-of-spa-ad-data-collector-sets-in-win2008-and-beyond.aspx

Any errors in your logs?

Thanks

Mike
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by:Abacus IT
ID: 39248563
Thank you I was not aware of that. I will look into those tools. I do not see any errors in the event logs anywhere. Thanks
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by:Abacus IT
ID: 39248807
After some additional research I think it may be related to a DNS zone. I have to dig into that and I will also run the perfmon tool. Thanks again for your help.
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LVL 57

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by:Mike Kline
ID: 39248883
ok, that is definitely a good place to look if you suspect issues.  DNS is the backbone of AD.

Thanks

Mike
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Author Closing Comment

by:Abacus IT
ID: 39263617
thanks for the information. We believe it's DNS related.
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Expert Comment

by:Mike Kline
ID: 39263654
Thanks for the points, I should have also included this from the first Friday mailsack

http://blogs.technet.com/b/askds/archive/2010/02/05/friday-mail-sack-first-attempt-edition.aspx#defrag

Thanks

Mike
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