Thank you so much Ken for your response!
When I check in on my end dir replies with:
Volume in drive C has no label.
Volume Serial Number is 8279-8551
Directory of C:\ClusterStorage\Volume4\IT903S-FS1_DATA
08/30/2015 07:23 PM <DIR> .
08/30/2015 07:23 PM <DIR> ..
08/30/2015 07:23 PM 3,008,205,160,448 IT903S-FS1_DATA.VHDX
1 File(s) 3,008,205,160,448 bytes
2 Dir(s) 1,389,361,364,992 bytes free
And if I take that and divide that by the value you provided it seems to return a whole number:
3,008,205,160,448 / 1,048,576 = 2,868,848
The VHDX file itself was created via Disk2VHD from a 5 TB volume (with about 2.8 TB used) that was connected to one of our VMs via iSCSI Initiator (since our backup tools could not see the iSCSI Initiated drive so converting it to a VHDX was necessary in order
to allow it to be backed up). The backup itself appears to be fine...it's simply opening/mounting it via discutils (which seems to be used at an underlying level within the Altaro product) that seems to be the issue (and prevents the File Level Restore feature
from being used, which is one of the primary use cases we would have for the product).
Right now with the information I've shared above appearing to check out OK, would you have any other possible thoughts on what the issue could be?