You could mirror them, then you could use all the space. Not sure I see how you'd do a raidz2+raidz1 combo using those drives, at least not without losing 4TB

You could mirror them, then you could use all the space. Not sure I see how you'd do a raidz2+raidz1 combo using those drives, at least not without losing 4TB of the 8TB drive, but then I'm tired so.