Which kernel, and did you file a bug report?<p>e: To anyone not up on btrfs, its features are closely tied to the kernel version it&#x27;s used with. For example, raid56 scrub and device replace, and recovery and rebuild code were not available prior to kernel 3.19.<p>I also believe the only way to use 5&#x2F;6 modes before they were stable was to explicitly compile with them enabled. It wasn&#x27;t just something you could accidentally do.