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IMPORTANT. Before changing the sizes on any file system, unmount any NAS, DVD, CD or USB device from the server as it may interfere with the resizing process and lead to unpredictable results.

DO NOT JUST INCREASE THE SIZE OF AN EXISTING DISK WHEN USING VIRTUAL BASED SYSTEMS, ADD A NEW DISK OF THE EXTRA SIZE CAPACITY YOU NEED TO THE SYSTEM. 

Due to the way the disks are managed and allocated the is no support for extending the size of a disk, it has to be a new disk for volume manager to manage the disk and slice up the space for partitions to use. 

If you want to use a new contiguous larger disk for storing the data then you will need to build a FULL new Snare Central and then do a side by side migration if you want to keep the existing data to use this newer larger disk space.