ZFS raidz2 pool extend

I am using Freenas 9.10. I used 4 1tb disks to form a raidz2 pool. Now my pool space is not enough. I wanted to expand the space, so I added another 2 1TB disks via Volume Manager. I added it as a strip, and added it in 2 times. I was expecting to change from 4 disks raidz2 to 6 disks raidz2 but to my surprise, the system showed that my pool became 4 disks raidz2 and 2 disks strip. I tried to remove these 2 disks but failed, I couldn't delete these 2 disks in volume status. I use shell...

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