>>      raid0 = mirror(sd1e, sd2e)
>>      raid1 = mirror(sd3e, sd4e)
>>      raid2 = stripe(raid0, raid1)

That's basically what I did the time I had occasion to do software
RAID10.  It was on i386, not a SPARC, but this should be basically MI.

My notes say

raid0 - sd0e sd1e
raid1 - sd0h sd1h
raid2 - sd2h sd3h
raid3 - sd4h sd5h
raid4 - raid1d raid2d raid3d
raid5 - sd2e sd3e
raid6 - sd4e sd5e
raid7 - raid5d raid6d

While those notes don't say so, raid4 and raid7 are RAID0 and the
others are RAID1.

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