http://ivoras.sharanet.org/blog/tree/2010-06-23.help-test-zfs-v15.html
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I