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sbs 2011 migration fiasco

A coworker of mine was doing a migration of SBS 2003 to SBS 2011.  The initial migration went through fine and I stopped by our client's office to check in on him.  We had purchased 5 2TB drives (set in a hardware raid 5).  I noticed however that he chose MBR and we are now stuck with 5TB of unallocated and unusable space.  It wouldn't be so bad if it was a couple of gigs but they can't have that much wasted storage.  My question is this:

Is there any way we can get the 5 TB usable?

If not, can we demote the SBS 2011 server so we can rebuild it?  If so, how would I go about doing that?  Nothing other than the initial migration set up on the SBS 2011 has been done.  Of course Exchange is set up and roles were moved over during the setup.  What would I have to do to un-do these changes so I could rebuild?

I do have a good back up of the SBS 2003 server but I would prefer not having to do a restore if there was any way around it.
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bboxfl
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bboxfl
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
If you have not started the mailbox move then use the System State backup (hopefully?) taken just before running the migration prep tool and step the source back by restoring SS in DSRM.

Then configure the server. Note that WSB has a 2TB limit on VHD size used for backup. So, the partitions will be limited by that unless using a third party backup utility.

Philip
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bboxflAuthor Commented:
No, the mailbox move has not yet begun.  Fortunately my coworker decided to break for lunch before beginning that part. :)  The system state we have is from the night before so not immediately done before the migration prep.  I think though that it should be ok since the prep was done this morning.  Would you happen to have a guess on how long the System State restore would take in Directory Services Restore Mode?
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Yes, you are good to recover the SS from the previous evening. That will give you a fresh start.

SS is not too big, so not a long time. Off the top maybe an hour or less.

Philip
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