Unexpected RAIDframe behavior

[John Klos <john%ziaspace.com@localhost>]

Hi,

After setting up a RAID-1 mirror with RAIDframe in netbsd-6 (compiled 
from yesterday's tree), I'm seeing strange disk issues. The initial mirror 
was set up and was initializing while the system was booted off of the 
install kernel and both drives (wd0 and wd1) were writing at around 110 
MB/sec each. Some time after a reboot onto the installed system, I started 
seeing this from iostat:

      tty              wd0               wd1             raid0             CPU
 tin tout  KB/t  t/s  MB/s   KB/t  t/s  MB/s   KB/t  t/s  MB/s  us ni sy in id
   0   79 64.00  231 14.42  64.00  462 28.90  0.000    0 0.000   0  0  0  0 100
   0  239 64.00  253 15.84  64.00  506 31.62  0.000    0 0.000   0  0  1  0 99
   0   79 64.00  200 12.50  64.00  400 25.00  0.000    0 0.000   0  0  0  1 99
   0   79 64.00  194 12.13  64.00  388 24.26  0.000    0 0.000   0  0  1  0 99
   0   79 64.00  218 13.61  64.00  436 27.23  0.000    0 0.000   0  0  0  0 99

raid0 is completely idle - swap isn't even enabled - yet wd1 is doing 
twice the I/O as wd0. Does anyone know why this is the case?

John