Space recovery after raidz expansion

TrueNAS General
,
1

I have a raidz2 pool which started with 4x16TB disks and I expanded with an additional two disks
After expansion I run the zfs-inplace-rebalancing script and it seems to have run properly. zfs lists reports:

Column 1 Column 2 Column 3 Column 4 E F G H I J
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH
pool 87.3T 48.2T 39.1T - - 0% 55% 1.00x ONLINE
raidz2-0 87.3T 48.2T 39.1T - - 0% 55.20% - ONLINE

But the GUI reporta:

Usable Capacity: 42.16 TiB

  • Used: 23.36 TiB
  • Available: 18.8 TiB

Why the descrepency and how do I get the missing 20TiB back?
Thanks

2

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.

3

Thanks for the reply
Once I’ve filled up the 18TiB the gui reports will it show pool as full and will I start getting alerts?

4

No, the GUI will get new, and slightly less wrong, numbers as the pool fills. But it will always be wrong.