OS Version:TrueNAS-SCALE-22.12.4
Product:PowerEdge R730xd
Model:Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz
Memory:126 GiB
Once upon a time, I had a storage pool called “SplishSplash”. There was a dataset contained therein that had deduplication enabled. This went on for a couple of years, and things were fine. Eventually, I decided to “Turn-Off” deduplication as I didn’t think I was gaining much from it (and I wasn’t) – so I created a new dataset and copied the data from old → new. After verifying that all the data in the two datasets was 100% identical, I removed the old dataset and did a “zfs rename” on the new, giving it the old name. The problem is that the pool itself was set up with a dedup vdev (mirrored) … although the new dataset has dedup turned off, I cannot remove the dedup vdev from the top-level pool. Here is some output to prove nothing is using dedup:
→ zfs get all | grep -i dedup
SplishSplash,dedup,off,local
SplishSplash/.system,dedup,off,inherited from SplishSplash
SplishSplash/.system/configs-ba359f18b6b54dfdb0f43e03dabd3c67,dedup,off,inherited from SplishSplash
SplishSplash/.system/cores,dedup,off,inherited from SplishSplash
SplishSplash/.system/ctdb_shared_vol,dedup,off,inherited from SplishSplash
SplishSplash/.system/glusterd,dedup,off,inherited from SplishSplash
SplishSplash/.system/rrd-ba359f18b6b54dfdb0f43e03dabd3c67,dedup,off,inherited from SplishSplash
SplishSplash/.system/samba4,dedup,off,inherited from SplishSplash
SplishSplash/.system/services,dedup,off,inherited from SplishSplash
SplishSplash/.system/syslog-ba359f18b6b54dfdb0f43e03dabd3c67,dedup,off,inherited from SplishSplash
SplishSplash/.system/webui,dedup,off,inherited from SplishSplash
SplishSplash/docker-data,dedup,off,inherited from SplishSplash
SplishSplash/media,dedup,off,local
→ zpool status SplishSplash
pool: SplishSplash
state: ONLINE
scan: scrub repaired 0B in 10:03:38 with 0 errors on Sun Jan 7 10:03:45 2024
config:
NAME STATE READ WRITE CKSUM
SplishSplash ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
<< DISK 01 >> ONLINE 0 0 0
<< DISK 02 >> ONLINE 0 0 0
<< DISK 03 >> ONLINE 0 0 0
<< DISK 04 >> ONLINE 0 0 0
<< DISK 05 >> ONLINE 0 0 0
<< DISK 06 >> ONLINE 0 0 0
<< DISK 07 >> ONLINE 0 0 0
<< DISK 08 >> ONLINE 0 0 0
<< DISK 09 >> ONLINE 0 0 0
<< DISK 10 >> ONLINE 0 0 0
<< DISK 11 >> ONLINE 0 0 0
dedup
<< UN-USED SSD >> ONLINE 0 0 0
spares
<< DISK 12 >> AVAIL
errors: No known data errors
I had two drives in the dedup vdev, in mirror mode – I was able to OFFLINE and REMOVE one of the drives, but now the other is stuck. Any help to remove the unused dedup so I can recover those drives is appreciated.
Thank you!