Re: general thoughts and questions + general and RAID5/6 stability?

[Austin S Hemmelgarn]

On 2014-09-23 10:23, Tobias Holst wrote:

If it is unknown, which of these options have been used at btrfs
creation time - is it possible to check the state of these options
afterwards on a mounted or unmounted filesystem?


2014-09-23 15:38 GMT+02:00 Austin S Hemmelgarn <ahferro...@gmail.com
<mailto:ahferro...@gmail.com>>:

    Well, running 'mkfs.btrfs -O list-all' with 3.16 btrfs-progs gives
    the following list of features:
    mixed-bg                - mixed data and metadata block groups
    extref                  - increased hard-link limit per file to 65536
    raid56                  - raid56 extended format
    skinny-metadata         - reduced size metadata extent refs
    no-holes                - no explicit hole extents for files

I don't think there is a specific tool for doing this, but some of them do show up in dmesg, for example skinny-metadata shows up as a mention of the FS having skinny extents.

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