Server 2012R2 disk space lower than expected

I have a server 2012R2 system operating as a Hyper-V host to two VMs.  The two VM VHD files together add up to about 2tb.  The host machine has a drive of 7.5tb.  Free space on the drive is only 2.25tb...  By my crude math I am missing about 3tb of space.  I tried doing a search of the host drive for large files.  I did adjust to show hidden and system files before the search, no luck.

Where should I look for my wayward 3tb of disk space?

Kris

September 3rd, 2015 2:07pm

Hi Kris,

First it is recommended to run a Check Disk. It can help show the correct size on volume.

I encountered 3 possible causes of this issue.

1. Check if it is caused by paging file.

2. Sometimes we will have some programs installed, which reserved certain size for their log or any data file.

3. By default we do not have permission to access some folders such as "System Volume Information" folder. Sometimes it is a large folder but will not be calculated because of the permission issue.

Here is a thread which is caused by Event log it will also not be calculated so disk space is missing from Properties of system volume:

Server 2008 R2 losing 2 GB of hard disk space per day

http://social.technet.microsoft.com/Forums/en-US/b9ea0208-0f28-4917-95ab-96a0686cdeb2/server-2008-r2-losing-2-gb-of-hard-disk-space-per-day?forum=wins

For further information, here is an article which provided detailed information about "missing disk space":

NTFS Misreports Free Space?

http://blogs.msdn.com/b/ntdebugging/archive/2008/07/03/ntfs-misreports-free-space.aspx
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September 7th, 2015 1:26am

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