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add note to docs about overlay + btrfs
Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
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@ -180,7 +180,10 @@ share executable memory between devices. Use `docker -d -s btrfs -g /mnt/btrfs_p
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The `overlay` is a very fast union filesystem. It is now merged in the main
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Linux kernel as of [3.18.0](https://lkml.org/lkml/2014/10/26/137).
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Call `docker -d -s overlay` to use it.
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Call `docker -d -s overlay` to use it.
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> **Note:**
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> It is currently unsupported on `btrfs` or any Copy on Write filesystem
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> and should only be used over `ext4` partitions.
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#### Storage driver options
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