is unraid about to nuke my btrfs pools ?

[tjb_altf4]

Adding some drives which required some moving of cables, one hba cable wasn't hooked back up correctly and so those drives didn't appear.

Array was not started, pools were not mounted.

No problem shutdown and fix, they reappear on boot, all good

 

Now I see a warning against the drives in those pools "All existing data on this device will be OVERWRITTEN when array is Started"

Is this actually going to overwrite the data on those drives ?

 

[tjb_altf4]

root@fortytwo:~# btrfs fi show
Label: none  uuid: 533c0b3a-8a34-4203-af2e-9c380d554c7a
        Total devices 1 FS bytes used 190.76GiB
        devid    1 size 476.94GiB used 221.03GiB path /dev/nvme0n1p1

Label: none  uuid: b4460fad-e372-492d-af6e-7a766202415d
        Total devices 2 FS bytes used 981.27GiB
        devid    4 size 1.82TiB used 1.05TiB path /dev/nvme1n1p1
        devid    5 size 1.82TiB used 1.05TiB path /dev/nvme2n1p1

Label: none  uuid: 77c414a6-8ac6-4003-b447-689ca96865f3
        Total devices 3 FS bytes used 7.23TiB
        devid    1 size 3.64TiB used 2.57TiB path /dev/sdd1
        devid    2 size 3.64TiB used 2.57TiB path /dev/sdb1
        devid    3 size 3.64TiB used 2.57TiB path /dev/sde1

Label: none  uuid: f522172e-c3f4-4f7a-9727-3b69a5ab81f4
        Total devices 4 FS bytes used 65.28TiB
        devid    1 size 16.37TiB used 16.34TiB path /dev/sdu1
        devid    2 size 16.37TiB used 16.34TiB path /dev/sdo1
        devid    3 size 16.37TiB used 16.34TiB path /dev/sdm1
        devid    4 size 16.37TiB used 16.34TiB path /dev/sdl1

Label: none  uuid: f7538fe8-507c-4c36-bd3c-aadc92dc921a
        Total devices 4 FS bytes used 64.91TiB
        devid    1 size 16.37TiB used 16.26TiB path /dev/sdw1
        devid    2 size 16.37TiB used 16.26TiB path /dev/sdaa1
        devid    3 size 16.37TiB used 16.26TiB path /dev/sdt1
        devid    4 size 16.37TiB used 16.26TiB path /dev/sdn1

Label: none  uuid: 67290cac-5453-458c-90f2-10835ff79fe4
        Total devices 2 FS bytes used 32.56TiB
        devid    1 size 16.37TiB used 16.30TiB path /dev/sdy1
        devid    2 size 16.37TiB used 16.30TiB path /dev/sdac1

 

this seems to indicate everything is OK, but I have NFI what the Unraid GUI is about to do if I start the array.

(the two 4 device pools are the ones in question)

[tjb_altf4]

OK after finding a similar report by another user, I decided to reboot as he did and the warning went away as it did for him... Started the array and all is well... thank fk.

 

This is the second time Unraid's BTRFS pool state management has tripped me up, it would be great to see the BTRFS implementation in Unraid get a bit more love before we dive in the deep end with ZFS.

Edited December 23, 2021 by tjb_altf4