For EC-Series (C200, C400, C800, and C800+), H-Series (HC400T, HC400E, HC400, HC1200, and HC2400M), and X-Series (XC900 and XC1200) gateways, you can increase volume size when the volume defined in the gateway does not use all the available storage. See Increasing a Volume Size When Additional Storage is Available for the Volume.

For V-Series gateways (AWS, Azure, ESXi, Hyper-V, KVM/OpenStack, and Nutanix AHV), as well as increasing volume size when the volume defined in the gateway does not use all the available storage, as described in Increasing a Volume Size When Additional Storage is Available for the Volume, you can also increase the storage by either adding an additional disk or enlarging the existing disk. The recommended procedure is to enlarge the existing disk, if possible. See Increasing Storage for a V-Series Gateway.