raid 10 drive replacement on old raid6 btrfs volume

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I started experimenting with an 8 drive BTRFS RAID6, but rebalanced it a while ago as RAID10.  Recently though I’ve run into problems when trying to replace a drive.

> Nov 18 10:18:44 ganymede kernel: BTRFS warning (device sdk): dev_replace cannot yet handle RAID5/RAID6

Even though df shows RAID10:

> Data, RAID10: total=4.65TiB, used=4.62TiB
> System, RAID10: total=64.00MiB, used=432.00KiB
> Metadata, RAID10: total=34.00GiB, used=31.36GiB
> GlobalReserve, single: total=512.00MiB, used=0.00B

Am I out of luck and need to copy everything off and start over?

Thanks,
-Craig

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