I messed up and rather than starting a new cache pool as I had meant to do with my 2 512 SSD's I incorrectly added them to a pool with my 2TB nvme cache drive.

I stopped the array and removed the drives and the slots. So now I'm down to a single cache drive

 

First it was incorrectly showing 1.5TB capacity so I ran the balance and it didn't change things.
I did some research and found the post below:

So I ran the command below to try and convert back to single vs raid1.

Single: requires 1 device only, it's also the only way of using all space from different size devices, btrfs's way of doing a JBOD spanned volume, no performance gains vs single disk or RAID1

btrfs balance start -dconvert=single -mconvert=raid1 /mnt/cache

I actually ran that twice but am left with 3TB showing above.
Here is a view of the balance status and it appears it's still in Raid1

 

I was of the impression the convert command was supposed to change this.

Also I don't see the drop down next to the balance button shown in the post above.

Any other ideas on how to get this corrected back to a single drive with 2TB of capacity?

Edited December 2, 20223 yr by mc_866
formatting

Having raid1 metadata indicates there's at least one more device that is still part of the pool, please post the diagnostics.

You didn't correctly remove the devices from the pool, it still has 3 members:

 

                  Data      Metadata System               
Id Path           single    RAID1    RAID1     Unallocated
-- -------------- --------- -------- --------- -----------
 1 /dev/nvme0n1p1 849.00GiB  3.00GiB  32.00MiB     1.03TiB
 2 /dev/sdb1              -  2.00GiB  32.00MiB   463.73GiB
 3 /dev/sdc1              -  1.00GiB         -   464.76GiB

 

In the end do you wan the current data there to remain in the NVMe device or in the other two?

I want all the data on the nvme and to revert back to a single cache drive.

 

it only shows a single drive in the gui, is there a way to change it back to a single drive?

I want all the data on the nvme and to revert back to a single cache drive.

Assuming you mean the NVMe device and since the data won't fit on just one the the other cache devices you'll need to remove the other 2 members manually, with the array running type in this order:
 

btrfs balance start -f -mconvert=single /mnt/cache

btrfs dev del /dev/sdb1 /dev/sdc1 /mnt/cache

 
When done post new diags

16 hours ago, mc_866 said:

Appears only one drive now in the cache.

Yep, you're all set.

Thanks for the help!!