writes raid-6 building

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While raid-6 is building I noticed writes are going on to all the
drivers. Whereas in  raid-5 I see writes happening to only one drive.
Any clue ?

---------- iostat dump for raid-6 ---
Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda             152.76        23.81         3.74         47          7
sdb             181.91        25.35         5.50         50         10
sdc             161.31        24.84         3.30         49          6
sdd             153.77        23.52         4.02         46          8
sde             169.85        26.29         3.27         52          6
sdf               0.00         0.00         0.00          0          0
sdg               0.00         0.00         0.00          0          0
sdh               0.00         0.00         0.00          0          0
sdi               0.00         0.00         0.00          0          0

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sda             152.02        24.05         3.44         47          6
sdb             168.18        26.23         4.14         51          8
sdc             163.64        22.76         3.69         45          7
sdd             166.67        24.37         4.04         48          8
sde             166.16        24.78         3.57         49          7
sdf               0.00         0.00         0.00          0          0
sdg               0.00         0.00         0.00          0          0
sdh               0.00         0.00         0.00          0          0
sdi               0.00         0.00         0.00          0          0
---------------
Thanks,
Marri
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