how to cleanup old superblock

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Hello!
Long time ago I created btrfs on /dev/sda
After some changes btrfs moved to /dev/sda1 (well, to md, and sda1 is part of md).

As result, <btrfs fi show> show me 2 filesystems: new one and old one.
Probably I need to do some cleaning. Can someone tell me what to do.

fdisk -u -c -l /dev/sda

Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
81 heads, 63 sectors/track, 765633 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xde07ba46

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048  3907029167  1953513560   fd  Linux raid


btrfs fi show
Label: 'storage'  uuid: ea3824ec-2fd5-4813-88da-d96c319029f4
        Total devices 1 FS bytes used 50.87GB
        devid    1 size 1.82TB used 138.04GB path /dev/md127

Label: 'mainst'  uuid: 1bd2b9be-5464-4926-88da-af8e12c21f94
        Total devices 3 FS bytes used 45.94GB
        devid    1 size 1.82TB used 123.04GB path /dev/sda
        *** Some devices missing

Last one is wrong.


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