Truenas Scale improper expansion after adding disk

[neofusion]

This has come up many times before, here’s as good an answer as any:

Space recovery after raidz expansion

Ignore the GUI report and only use the CLI data. The CLI is more correct. It’s a known issue mentioned in the release notes when the Raid Z Expansion first appeared Just search RAID-Zx-expansion tag and have fun reading. It should be explained in there.