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ftp - gradual increase in capacity of a virtual hdd

Im very new in using ESXI/vSphere and im planning to create an FTP server and i just needed to know some few basic things.



How do i gradually increase the disk capacity in a virtualize environment or is it even possible?



a typical scenario would be, i initially utilize 10GB storage capacity for FTP server, and as demand increases, i can easily increase it to 20GB.




what type of filesystem do i need to achieve this? or do i have to create a virtualize harddisk?

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