Hi,
Thank you for your reply!
According to your description, you seem to be unable to expand a VHDX with an initial disk size of 4TB in the cluster after the cluster replication is completed.
I will first suggest you to confirm whether you are using static disk or dynamic disk. If you use static storage space allocation, the size of the disk space is determined at the beginning. You can only expand the disk with this type of disk when your storage space has enough unallocated disk space. If your storage space does not have enough unallocated disk space and you use static disk, then disk expansion cannot be properly performed.
To check which disk type you used, you can open Hyper-V Manager>> inspect disk, and find the target disk file and right click to view the properties of the disk.
If you have used dynamic disks, but the issue still exists, then your issue may be attributed to the shortage for your whole disk space. In this case, you can check your usage status of your cluster storage space.
Thank you for your time!
Best regards
Joann
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