Extends or increases the size of an existing logical unit. To specify a new size for the unit, use the /SIZE qualifier. The size specified must be greater than the current unit size. When extending a unit with other units present on the same set of drives, some units may be moved (undergo volume expansion) to make space for the additional size required. Note that even though the UNIT size increases on SET UNIT/EXTEND command completing successfully, the increased size will reflect in OpenVMS only after the appropriate Dynamic Volume Expansion (DVE) steps such as SET VOLUME/LIMIT and SET VOLUME/SIZE are executed successfully at the DCL prompt. For more details, refer to Chapter 9 on Dynamic Volume Expansion (DVE) in "HP OpenVMS System Manager's Volume 1: Essentials manual". Note: The /SIZE qualifier should be used only in conjunction with the /EXTEND qualifier. Format: SET UNIT <Unit_n> /EXTEND/SIZE=S where Unit_n = (0-31) s=size in MB or GB (ex:10MB/20GB)