partman multi disk

Current multi disk config
d-i partman-auto/expert_recipe string  \
   recipe ::                           \
                                       \
   30720 100 30720 ext4                \
   $primary{ }                         \
   $bootable{ }                        \
   method{ format }                    \
   device{ /dev/sda }                  \
   format{ }                           \
   use_filesystem{ }                   \
   filesystem{ ext4 }                  \
   mountpoint{ / } .

   409600 200 100000000 ext4           \
   method{ format }                    \
   device{ /dev/sda }                  \
   format{ }                           \
   use_filesystem{ }                   \
   filesystem{ ext4 }                  \
   mountpoint{ /mysqllog } .

   1000 300 100000000 ext4             \
   method{ format }                    \
   device{ /dev/sdb }                  \
   format{ }                           \
   use_filesystem{ }                   \
   filesystem{ ext4 }                  \
   mountpoint{ /mysql } .

# lovely partition alignment option
d-i partman/alignment string optimal


previous working single disk config:
d-i partman-auto/expert_recipe string  \
   recipe :: 500 1000 10000000 ext4    \
   $primary{ }                         \
   $bootable{ }                        \
   method{ format }                    \
   format{ }                           \
   use_filesystem{ }                   \
   filesystem{ ext4 }                  \
   mountpoint{ / } .

# lovely partition alignment option
d-i partman/alignment string optimal