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has anyone used double take

Posted on 2010-08-24
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Last Modified: 2012-08-13
i have 4 server enterprise 2008. two are active and two failover. i will be using double take as the replication/failover software.

i am installing sql standard 2005, kofax scanning software, records management software, and a release script, and backup exec

will double take be able to replicate everything or do i have to purchase two of each of the software licenses?
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Question by:datatechdc
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Expert Comment

by:Lee W, MVP
ID: 33517916
I've used it on an SBS server.  The whole point to the server is to completely replicate the server that it was on from a software standpoint.  So, it SHOULD.  But I will say it's VERY UNWISE to implement without running tests and a demo first.  DoubleTake offers a 14 day demo - I strongly recommend you use it and experiment for yourself.  For me, the failover was NOT instant.  Depending on your configuration, you may be MUCH better off using a cluster or VMs in a cluster instead.
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by:datatechdc
ID: 33517934
even though it wasnt instant, did everything replicate? was there any data loss?
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by:Lee W, MVP
ID: 33517971
No data loss that was detected... but it then required a complete rebuild of the "failed" server. A straight cluster can prevent interruption caused by patching and reboots - DoubleTake cannot.
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by:Lee W, MVP
ID: 33517973
And when I say not instant - I mean it took close to 60 minutes to complete.  
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by:datatechdc
ID: 33518028
why did you have to rebuild the server?
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Lee W, MVP earned 500 total points
ID: 33518051
When it "fails over" it completely takes over as the old server.  If you just boot the old server back up, then you have two identical servers - right down to the name - on the same network - this would create HUGE problems.  So you would have to rebuild the server, install DoubleTake, fail things BACK, then rebuilt the second server (assuming the hardware was not otherwise equal; at my client they are using their old server as a backup so they wouldn't want to run for any length of time on the old hardware - it's purely a backup system.

(By the way, I'm assuming you would be using the full server failover that completely mirrors the system).
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