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Safe to upgrade my 2008 R2 file server to 2012 R2?

Posted on 2014-03-25
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Last Modified: 2014-03-25
I have a virtualized 2008 R2 file server running DFS and using ISCSI initiators to connect to 4 drives on a SAN.

What concerns, risks, or issues do you think there might be to doing an in place upgrade to 2012 R2? I want some of the new DFSR capabilities.

Yes, I have backups. Restoring would suck. Getting a maintenance window is painful. Before I go down the road, Im just looking for someone (or a few someones) to say "yep, Id feel comfortable doing it"

And secondly is it advantageous / necessary to disconnect the ISCSI drives before doing the upgrade? They're 4, 4, 10, and 4 TB respectively.
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Question by:Eric_Price
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by:Brad Bouchard
Brad Bouchard earned 2000 total points
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I can tell you that some of the new capabilities with DFSR would be worth it in my opinion.  I haven't taken a DFS server from 2k8 to 2k12, but I have taken a DFS/File Server from 2k8 to 2k8 r2 that had iSCSI targets and for the most part everything went fine.  I say most part, because I had to re-discover my targets, but once I did and then refreshed in Disk Management everything was all fine and dandy.

Hopefully you don't have to do that, but that would be the only thing I'd watch for.
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Brad Bouchard earned 2000 total points
ID: 39954657
And secondly is it advantageous / necessary to disconnect the ISCSI drives before doing the upgrade? They're 4, 4, 10, and 4 TB respectively.

Forgot to answer this.  It's not advantageous or necessary, but you might not have to rediscover the targets if you disconnect them before the upgrade like I mentioned in my first post.

Really you're not going to hose anything on the data side of the server as long as your SAN doesn't crash which shouldn't have any correlation to your VM.

The one thing I would mention is that if the system/Windows volume for this VM is on the SAN then you will have to keep at least that target for iSCSI.
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by:Eric_Price
ID: 39954739
Excellent comments, and pretty much what I anticipated would be said. Sometimes, I just worry about overlooking something obvious because I'm too close. Especially where a file server connected to TBs of business critical data is concerned.
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