you should definitely look at the free (as in beer, not as in open) version of veritas storage foundation.
while it is _extremely_ challenging due to its amount of features, it is the most robust, fastest, and cool-ish-est filesystem available on linux – plus it comes with a far more powerful volume manager than standard lvm.

i can’t even describe how much sleep it has saved me at work since the majority of systems has been migrated from dm-multipath/lvm/ext3 to veritas.

It might seem overkill for a normal home fileserver, but to be honest, I think the learning / setup time pay off tenfold by having less to worry about.