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Snapshots and Domain Controllers - Are they ALWAYS bad???

David, A colleague of mine said: < If the lab environment is powered down when the snapshots are taken that is fine. We run all our Microsoft courses that way and have done for years.> To which I...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

The key here is this; snapshots (with hyper-v) are NOT equivalent to backups.with VMware they are treated this way, but not with hyper-v. That is the big key point.they are fine for short durations but...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

I'm not sure that is the key for the OP?I don't think (hope) anyone is recommending using snapshots as a backup method, i think the question is more a theoretical 'Why can't i snapshot DC's?'. - At...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

The key here is this; snapshots (with hyper-v) are NOT equivalent to backups.with VMware they are treated this way, but not with hyper-v. That is the big key point.they are fine for short durations but...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

In short,i don't think anything is wrong with that if ALL DC's are restored using the same timeframe snapshots.Issues arise when one restores individual DC's from snapshots.What i personally do is...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

George, thanks for the response [although the issue has been quiet for months].Unfortunately it (like most of the others here) have not answered questions related to the specific scenarios I am...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

My understanding is that the backup process is not the issue, its the restore process.When you restore using 'application aware' backup software (like windows backup) once a DC is restored the backup...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

I dunno - let's take the DC out of the equation since it's, to me, mostly a red herring given this SPECIFIC scenario:  the virtual machine/guest OS is POWERED OFF when the snapshot is taken.That is my...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

@David CorbinI have read this entire thread as this is the exact question that has been circling my head and I have been looking for an answer too. Your questions / comments are exactly what I wanted...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

@DavidI totally agree and in those cases it makes perfect sense. I have a domain controller on a physical machine and the other virtulised and have searched countless hours on what-to-do if the...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

@dqnet - thanks for the response. While having domain controller(s) on dedicated machines certainly has many advantages, I have found that for many small/mid sized shops this is not always an option...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

@David CorbinI have read this entire thread as this is the exact question that has been circling my head and I have been looking for an answer too. Your questions / comments are exactly what I wanted...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

The best advice so far around this issue has been from the AD team itself and has finally been brought into one topic:http://technet.microsoft.com/en-us/library/dd363553(v=ws.10)There is an Operational...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

@BrainEg - thanks for the detailed post, and I agree with nearly everything (especially "there are a great number of admins out there that don't understand how AD works" and the ramifications...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

The 'official' guidance is to not do it.  For the same reason that you need to properly plan your AD deployment and frankly never-ever want all the DCs or BDCs to go down together.The primary reasoning...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

@BrianEh, regarding "Please do not consider a snapshot a backup"...In and of itself, I agree. However if a snapshot is taken while the machine is OFF (ie there is no "state") then the (now immutable)...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

Please do not consider a snapshot a backup.  It is not the case with Hyper-V (or XenServer, or any hypervisor that is not ESX).The whole thing with snapshotting domain controllers is that in the...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

Carl - Thanks for the response, but I do not see how "neighbour DC's will think that they have already processed the USN for changes made." if ALL of the DC's are restored to the same point in time....

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Snapshots and Domain Controllers - Are they ALWAYS bad???

On operating systems before 2012 it will not update the invocation number on the NTDS.DIT database and therefore USN rollback is likely to happen as neighbour DC's will think that they have already...

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Snapshots and Domain Controllers - Are they ALWAYS bad???

Hi,To understand the difference between recovery from Snapshots and from general system back, please understand USN rollback.Refer to these articles to understand USN and USN rollback:USN and USN...

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