You can carry out space reservation operation on both restricted and unrestricted type of FlexClone volumes. By default FlexClone volumes do not have write reservations.
Following are the space reservation settings for the FlexClone for unrestricted and restricted FlexClone volumes:
Unrestricted FlexClone volumes: If -reserve option is given in the CLI or flexclone-writereserve-enabled = on in snapdrive.conf, the space reservation would be set to volume on the FlexClone, otherwise it is none. SnapDrive for UNIX shows an error message if the space available on the aggregate is not sufficient to adhere to this setting.