Sole's Blog

Posts Tagged ‘dns server’

So You went ahead and used virtualized Domain Controllers for Your Active Directory domain, congratulations! I am sure You will be happy with the decission, as long as You have a decent virtualizing environment, this will give You both peace of mind, faster recovery and cheaper redundancy.

There is however some special considerations You must do, when You are using virtual Domain Controllers, not to mention, please with sugar on top, do NOT P2V/Convert Your physical Domain Controllers to virtual, without at least reading this article!

What areas do we need to consider on a virtual DC?

• Time synchronization
• Disk cache
• Suspend/pausing virtual machine
• Snapshots and System State backups
• Performance

Personally I much prefer virtual Domain Controllers, from having a lot of physical ones, but there are some considerations to be made, about perhaps leaving some physical and what features to use on the virtual and what settings to use as well. This article attempts to uncover some of the points to consider, specifically for virtal DC’s. The list is in no way meant to be the only considerations, but is mostly the things that I personally have noticed forgotten in environments I have encountered. Add Your own preferences and research to this and You should be well on Your way to live happily forever with Your virtual DC’s.

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I recently had a problem at a customer, where Windows Server 2008 DNS, at times would not resolve requests for certain top level domains (Among others .CN, .BR, .DK and .CO.UK). The customer would experience the problem every 12-48 hours and fix it by restarting the DNS server service – not acceptable.

The problem is reproduceable and is limited to all Windows 2008 servers of all editions, including Small Business Server (SBS), where the DNS server uses root hints for internet resolution. Read the rest of this entry »