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As you can set this per filesystem one can create one large metadevice out of e.g. many Raid devices and create "low security" filesystems without ditto blocks and and "high security" filesystems with instant copies spread over the different raid arrays. Even if one whole Raid Array fails, the filesystem with ditto blocks enabled will still work as normal.
This adds further levels of data protection to really important data as well as more granularity to chose how "secure" your data should be.
Some Maths about what combination of raidlevels and copy levels is best suited for your needs can be found within the posting linked above."
Tricorder — Star Trek
A-wing — Star Wars
Tube Transport System — Futurama
Hover cars — Fifth Element
Computer interface — Minority Report
Cowboy Neal Robot -
Feel free to add your own. I wouldn't want this limited to just the couple off the top of my head. You know people will complain for lack of options anyways."