sudo mknod ./xvda  b 202  0
sudo mknod ./xvda1 b 202  1
sudo mknod ./xvda2 b 202  2
sudo mknod ./xvdb  b 202 16
sudo mknod ./xvdb1 b 202 17
sudo mknod ./xvdb2 b 202 18
sudo mknod ./xvdc  b 202 32
sudo mknod ./xvdc1 b 202 33
sudo mknod ./xvdc2 b 202 34