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The minimum disk sizes are hard-coded in the installer at https://github.com/harvester/harvester-installer/blob/21679efdfcabfb117dd136967c4531f9cd7217ec/pkg/config/config.go#L34-L38 so with a single disk it just flat out won't let you install with <250G. With multiple disks it enforces a minimum of 180G for the root disk and 50G for the data disk, so one way around is (if possible) get a second disk in there. There is an open issue requesting that we allow skipping the disk size check for cases like yours (see https://github.com/harvester/harvester/issues/6064) but that hasn't been implemented yet

Thank you 🙂 I guess I'll buy a bigger disk for the testing then haha