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snapraid
A backup program for disk arrays. It stores parity information of your data and it recovers from up to six disk failures
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If the data does not change very often (like a media archive), and you are willing to sacrifice a disk or two for redundancy, you can look at SnapRAID. It’s got it’s own quirks, but it degrades from unrecoverable disk loss much more gracefully (IMO) than striped RAID setups.
For future reference, consider using mergerfs to pool a bunch of random disks/partitions under a single mount point. It will do exactly what you were trying to accomplish. (You can use whatever filesystem you want on each disk).