need VM drive partitioning instructions

J.R. Sitman
J.R. Sitman used Ask the Experts™
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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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Top Expert 2016
Commented:
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
J.R. SitmanIT Director

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Commented:
So I can put back what I shrank and the VM will use the amount I determine, correct?
Top Expert 2016
Commented:
Yes, it normally creates a vhd of 129GB which is dynamically expanding as needed.
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J.R. SitmanIT Director

Author

Commented:
so the physical drive of the host doesn't determine the VHD of the VM?
Top Expert 2016
Commented:
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.
J.R. SitmanIT Director

Author

Commented:
I accepted the default which was 127GB, so can I now reduce it to say 55gb?
Top Expert 2016

Commented:
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.
J.R. SitmanIT Director

Author

Commented:
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.
Top Expert 2016

Commented:
It won't grow to that size so should not be a problem..
J.R. SitmanIT Director

Author

Commented:
Great, thanks
J.R. SitmanIT Director

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Commented:
thanks

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