The appliance system storage interface provides a method to list the storage partitions used by the vCenter Server Appliance, and a method to resize storage partitions.

The resize method is not a general-purpose way to set arbitrary partition sizes. Its unique purpose is to resize all partitions to their maximum size. This is particularly useful for situations where the vCenter Server Appliance database is approaching capacity and you need to expand one or more virtual disks. You can resize virtual disk backing files using the ExtendVirtualDisk_Task method of the VMware Web Services API, then use this interface to resize the partitions available to the guest operating system.