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Mirror in Windows 2008

Posted on 2013-05-30
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Last Modified: 2013-05-30
I have 2 disks and one of them has the OS on it.  They are both dynamic disks. I want to create a  mirror for the OS.  How can I do this?
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Question by:WellingtonIS
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by:Lee W, MVP
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Make the other disk an empty disk (NO PARTITIONS).  Right-click on it your main disk and the option to mirror should be there.  (Going from memory - don't have a system I can try this with at the moment).

And I assume you are wanting to do this as a software mirror instead of a faster, more reliable hardware mirror, right?
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by:WellingtonIS
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yes but when I click on the disk it's not giving me that option
disks.png
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by:Lee W, MVP
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Please post a screen shot.  And remember - the second disk must be EMPTY - NO PARTITIONS!
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by:WellingtonIS
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I did.  I'm thinking I have to delete the system reserve?  Can I do that?
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by:Lee W, MVP
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Didn't see the screen shot before.

Your problem is that your SYSTEM partition is on Disk 1 and the Boot and Windows install are on disk 2.  You CANNOT create a mirror because with the System partition taking 100 MB on disk 1, disk 2 is too big to mirror.
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by:WellingtonIS
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Can I delete the system reserve?
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by:Lee W, MVP
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You would need to reinstall and put both the SYSTEM and BOOT partitions on the same disk.

You MIGHT be able to shrink the Boot partition by a couple hundred MB and then mirror it to the other disk... but this could wind up being tricky and certainly would be non standard.  Especially if this is a new install, wipe and reload and make sure you put everything on ONE disk then you can create your mirror of both the system and boot partitions on the other disks.
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by:WellingtonIS
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OK I shrunk the OS by 100 mb they are now equal.  I still cant mirror it.
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by:WellingtonIS
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OK so how can I install windows so I can mirror 2008 server?
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by:WellingtonIS
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windows key + X key does nothing.
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Lee W, MVP earned 500 total points
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If it's even ONE BYTE smaller then it's not going to work.  That's why I said shrink by a couple of hundred MB, not 100 MB.
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by:WellingtonIS
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I shrunk the OS by 100 mbs.  So it was exactly the same size.  i still could not mirror it
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by:WellingtonIS
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I did it again and it worked
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