HostRaid support on FreeBSD

[Doug Ambrisko]

Søren Schmidt writes:
| Reading the metadata off the disks and using that info to access a RAID 
| array is easy and can be had even without docs in a few hours. Writing 
| back the metadata in case of failures etc to retain sanity of the array 
| is "somewhat" more difficult. Actually I'm working with this currently 
| for new formats for ata-raid and its not trivial to get right.

Of which we've done the Intel 2 drive format read, write deal with 
broken mirrors etc.  Writing and dealing with broke mirrors was harder
and can lead to breaking the Intel RAID BIOS code :-(

It's available in our -stable ata SATA patches that have been updated to
4.10-RELEASE.

Doug A.