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A comment on Btrfs Coming to Fedora 33. Parent comment

Re:Btrfs Coming to Fedora 33 by tobias3 on Monday August 24, 2020 @05:02AM (#24258729)
Synology has solved it by running btrfs on top of mdraid, then patching it so that btrfs reports errors to mdraid and putting repair code into mdraid. This reliably works.

I'm sure some would be interested in this, but Synology seems to not take GPLv2 too seriously and nobody seems to care about this.

RAID 5/6 in btrfs is relatively neglected because the big users that pay developers to work on btrfs (and put the work up-stream) don't care that much about it. E.g. Facebook is probably using it for their HDFS storage, so HDFS gives them the RAID functionality.

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Re:Btrfs Coming to Fedora 33 by throwaway8941 on Monday August 24, 2020 @05:13AM (#24258791)
They use it for everything except MySQL databases, which are stored on XFS.

There was a recent discussion on LKML where Chris Mason (I think) described all this.

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Re:Btrfs Coming to Fedora 33 by petre on Monday August 24, 2020 @06:10AM (#24259145)
Does XFS have better performance than ext4 for MySQL DBs?
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