I am going to purchase a HP Microserver gen8 system for a home fileserver and it contains 4 drive bays.

I will use those four drive bays to create a single zpool for mass storage.

My goal is the ability to survive any two drive failures from that four drive pool.

I know I can do this with a four drive raidz2 pool - that would allow me to lose any 2 of the 4 drives and still be healthy.

But it seems like a lot of overhead and resilver stress to run a raidz2 pool when I don't really need it ...

So, is there some other pool configuration that will fulfill that "any 2 out of 4" requirement ? Two mirrors joined as a single zpool does NOT fulfill it, since I could lose two drives in the same mirror and lose the entire pool.

Thank you.