Problems creating a RAID with 512 SPSU

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

I tried to create a RAID 5 with 512 sectPerSU and upon raidctl -i, I get
        mpt0: error 22 loading DMA map
        sd6(mpt0:0:7:0): generic HBA error
        raid1: IO Error.  Marking /dev/sd6a as failed.
        sd5(mpt0:0:5:0): generic HBA error
        sd4(mpt0:0:4:0): generic HBA error
        sd3(mpt0:0:3:0): generic HBA error
        sd2(mpt0:0:2:0): generic HBA error
        Unable to verify parity:  can't read the stripe
        Could not verify parity
        raid1: Error re-writing parity (1)!
Are stripes units larger than MAXPHYS impossible?