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is it possible for Btrfs to use SSD for metadata only & leave bulk data on less costly storage such as HDD? I refered to this page Using_Btrfs_with_Multiple_Devices and can not find a solution.

Thanks!

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    It would say it cannot at this time, but it would be very interesting to know if this is somewhere in the roadmap! – Law29 Apr 15 '16 at 14:58
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I've had some success with using bcache to combine ssd and hdd as the backing device for btrfs. The cache hit ratio varies by workload, but can be quite nice and can be monitored via /sys/fs/bcache

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