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need VM drive partitioning instructions

Posted on 2012-12-24
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Last Modified: 2012-12-31
I've built a new 2008 R2 server. I'm installing all the updates now.  When it's done, I'm adding it to our domain and making it a DC.  Then I'll add Hyper-V.  The question is on the Host do I leave all the available space on drive C or do I shrink it and use the available for the VM.  Or does the VM use a portion of the C drive on the Host?
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Question by:J.R. Sitman
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David Johnson, CD, MVP earned 500 total points
ID: 38719120
The VM creates a file *.vhd which is its hard drive (basic setup) but you can use the unpartitoned space on the physical disk (advanced users only). Ergo it will normally use space on the host drive
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Author Comment

by:J.R. Sitman
ID: 38719124
So I can put back what I shrank and the VM will use the amount I determine, correct?
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Assisted Solution

by:David Johnson, CD, MVP
David Johnson, CD, MVP earned 500 total points
ID: 38719133
Yes, it normally creates a vhd of 129GB which is dynamically expanding as needed.
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Author Comment

by:J.R. Sitman
ID: 38719250
so the physical drive of the host doesn't determine the VHD of the VM?
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Assisted Solution

by:David Johnson, CD, MVP
David Johnson, CD, MVP earned 500 total points
ID: 38719273
if you set the maximum size of the vhd to 129Gb and you only have 100G free eventually as the vhd drive fills out and takes space away from the physical drive eventually you will run out of space. Be judicious when you allocate the space.. you can always copy the vhd onto another drive and just change the virtual machines settings to reflect the changes.
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Author Comment

by:J.R. Sitman
ID: 38719279
I accepted the default which was 127GB, so can I now reduce it to say 55gb?
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Expert Comment

by:David Johnson, CD, MVP
ID: 38719298
not really without creating a new .vhd if you look at the ACTUAL size of the .VHD you will find it ony a few MB right now.
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Author Comment

by:J.R. Sitman
ID: 38719303
So please help me understand.  If my physical disk is 135gig and the VHD is 127GB, isn't that a problem?   The VHD is going to have very little installed on it.  The VM will basically be a DSN server and eventually hold our Anti-Virus distribution software.
If this is a problem I can always remove the VM and create a new one.
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Expert Comment

by:David Johnson, CD, MVP
ID: 38719330
It won't grow to that size so should not be a problem..
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Author Comment

by:J.R. Sitman
ID: 38719417
Great, thanks
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Author Closing Comment

by:J.R. Sitman
ID: 38732533
thanks
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