{
      "Type" : "AWS::EC2::Instance", 
      "Properties" : {
        "ImageId" : { "Fn::FindInMap" : [ "AWSRegionArch2AMI", { "Ref" : "AWS::Region" }, 
                                          { "Fn::FindInMap" : [ "AWSInstanceType2Arch", { "Ref" : "InstanceType" }, "Arch" ] } ] },
        "KeyName" : { "Ref" : "KeyName" },
        "InstanceType" : { "Ref" : "InstanceType" },
        "SecurityGroups" : [{ "Ref" : "Ec2SecurityGroup" }],
        "BlockDeviceMappings" : [
          {
            "DeviceName" : "/dev/sda1",
            "Ebs" : { "VolumeSize" : "50" } 
          },{
            "DeviceName" : "/dev/sdm",
            "Ebs" : { "VolumeSize" : "100" }
          }
        ]
      }
}