With four drives A,A,B,B where A is fast access and/or
high-throughput, and B is either slow to seek and/or has slower
transfer speed, what are the implications for mirrored ZFS pools?

In particular I am wondering how the IO performance will compare between:

zpool create mypool mirror A A mirror B B

and

zpool create mypool mirror A B mirror A B

and

zpool create mypool mirror A B mirror B A

Thanks,
Charles Menser
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