New answers tagged compression
There is no online deduplication currently. It's planned, but not yet implemented. There is an experimental patchset ( www.mail-archive.com/linux-btrfs%40vger.kernel.org/msg32862.html ) if you want to try it. Just from personal experience there is no noticeable performance hit of online compression on a hasswell i5 4460 when writing to a ssd and 3 hdds at ...
You can't. Not yet. The feature hasn't been implemented, https://btrfs.wiki.kernel.org/index.php/FAQ#Can_I_find_out_compression_ratio_of_a_file.3F
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