checkpoint 1:
$VAR1 = {};
vol: , ,
in for loop
in if, tmp :0 1 2 3 4
in for loop
in if, tmp :0 1 2 3 4
checkpoint 2:
$VAR1 = {
          'volumes' => {},
          'maxVolId' => '4',
          'isInternal' => 'false'
        };
vol: HASH(0x8479e1c), ,
voluems exist #######
checkpoint 3:
$VAR1 = {
          'volumes' => {
                         '1' => '0 1 2 3 4',
                         '0' => '0 1 2 3 4'
                       },
          'maxVolId' => '4',
          'isInternal' => 'false'
        };
vol: HASH(0x88d8144), 0 1 2 3 4, 0 1 2 3 4