Whee, almost lost ~20% of the data on this filesystem two days before I intended to finally upgrade my offsite backup host to be able to back it up completely. Murphy is one hell of an asshole.
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Why would you run a single host Ceph cluster? To gain experience? IMO mdraid is more reliable and easier to manage. Good luck!
mdraid does not scale. Rebuilds take forever, there's no intelligence, write-intent bitmap is nice but coarse, filesystem integrity is a bitch, no checksums, no ability to have disparate-sized disks. I have a 20TB md-raid array now and have had too many close calls.
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It would be interesting to see your opinion after using Ceph for a year or so (have a blog?) in your single mode scenario. My bet is you'll be less happy, but good luck either way! (I'm assuming CephFS?) Here's an old "easy ceph setup" I did. HTH https://purpleidea.com/blog/2015/12/28/trying-out-ceph-with-oh-my-vagrant/ …
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FWIW I already run two Ceph clusters in production, but it will be interesting having one or two personal setups (that I can afford downtime on).
End of conversation
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