Is it possible to turn an existing filesystem (with data) into a GlusterFS brick ?

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L.S.,

I was wondering if it would be possible to turn an existing filesystem with data
(ext4 with files en dirs) into a GlusterFS brick ?

I can't find much info about it except the following remark at [1] which seems
to indicate it is not possible yet:

        Data import tool

Create a tool which will allow importing already existing data in the brick
        directories into the gluster volume.
        This is most likely going to be a special rebalance process.

So that would mean i would always have to:
- first create an GlusterFS brick on an empty filesystem
- after that copy all the data into the mounted GlusterFS brick
- never ever copy something into the filesystem (or manipulate it otherwise) used as a GlusterFS brick directly (without going through a GlusterFS client mount)

because there is no checking / healing between GlusterFS's view on the data and the data in the
underlying brick filesystem ?

Is this a correct view ?

--
Sander Eikelenboom

[1] https://gluster.readthedocs.io/en/latest/Developer-guide/Projects/
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