booting of large raidz2 fails - all block copies unavailable

[Steven Hartland]

Just installed a machine using mfsbsd 8.2-RELEASE with raidz2 across
14 x 3TB Disks but boot fails with the following at the boot loader:-
ZFS: i/o error - all block copies unavailable 

There seems to have been several threads on this in the past but
all seem to have been resolved a long time ago.

I tried 9.0rc1 mfsbsd and that just sits at a spinney cursor with
no signs of any progress :(

Any advice?

    Regards
    Steve

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