The ResizeVmVolume script can resize to an arbitrary size - there is a problem if you try to increase to a size > 16TB and the volume in question was originally formatted on SIEM 10.x or older, but there is no restriction to 10GB at a time.
Using the VM Data feature is a good way to increase the storage as well. This allows you to make use of faster and slower storage similar to a hardware appliance - the bulk storage you are currently adding would make for a good Data drive, and if you get the opportunity to add high speed storage e.g. SSD storage you can add that as an index drive to improve performance.
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