johnfzc

username <username> priv 15 secret <your password>

aaa new-model
aaa authentication login default local
aaa authorization exec default local 

johnfzc

for device in sdb3 sdc1 sdd1 sde1; do
  dev=/dev/$device
  ovl=/home/ubuntu/$device-overlay
  truncate -s200M $ovl
  newdevname=$device
  size=$(blockdev --getsize "$dev")
  loop=$(losetup -f --show -- "$ovl")
  printf '%s\n' "0 $size snapshot $dev $loop P 8" | dmsetup create "$newdevname"
done

johnfzc

johnf@carbon:~/personal/projects/openwrt/trunk$ make
 make[1] world
 make[2] target/compile
 make[3] -C target/linux compile
 make[2] package/cleanup
 make[2] package/compile
 make[3] -C package/libs/toolchain compile
 make[3] -C package/libs/libnl-tiny compile
 make[3] -C package/libs/libjson-c compile
make -r world: build failed. Please re-run make with V=s to see what's going on