Conversion of VMWare VM fails if total size of hard disks in VM is greater than 2TB RRS feed

  • Question

  • We have some VMware VMs running in VCenter 5.5. using the MVMC tool we found that we could not convert VMs if the sum of the disk sizes in the source VM is greater than 2TB. We began with an old VM to test with which had a 100GB OS disk with two 1TB disks for data. The VM would not convert.

    We then backtracked to a new empty VM of just Server 2012 R2, and it converted. We then added two thin provisioned 1TB hard disks to the test VM and left them empty. The test VM would no longer convert. We then removed one of the 1TB HDs from the test VM, and it would convert again. We then added an 850GB hard disk to the test VM, to bring the total size to 1.95TB, and it converted.

    As a final test we made the test VM have its 100GB OS disk, a 1TB data disk, and another 1TB disk, where we only partitioned 850GB of it. This let us check if it was the disk size or the partitioned size that was causing the problem. In this configuration the VM would no longer convert, which left the disk sizes as the source of the error.

    In the MVMC tool, the error reported is from .NET, "Value was either too large or too small for a UInt64". It is reported just after the info line "Downloading VMware virtual disks from source virtual machine".

    I see no one reporting this problem yet, which seems unlikely.

    Monday, November 3, 2014 8:48 PM

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