AWS:Device Name Error when converting from Elastic Beanstalk instance from m3.xlarge to m4.xlarge

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I have an Elastic Beanstalk application using an m3.xlarge EC2 instance.

I wanted to try out using m4.xlarge instead so I cloned my EB instance. Then once it was running I clicked on Change Configuration and changed the Instance Type to m4.xlarge but then this gives the following error

Invalid root device name: '/dev/sda1', expecting: '/dev/xvda'.

Why is this error occurring ?

I have found this article

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/device_naming.html

which gives some background information but I still dont know what to about this error.

amazon-elastic-beanstalk amazon-web-services amazon-ec2
1 Answers

Turns out the problem was an ebextension script, did not realize they were checked at that stage, but I had configured a larger root disk, and in there it referred to /dev/sda1

Resources:
    AWSEBAutoScalingLaunchConfiguration:
        Type: AWS::AutoScaling::LaunchConfiguration
        Properties:
            BlockDeviceMappings:
               - DeviceName: /dev/sda1
                 Ebs:
                     VolumeSize:
                        35

changing it accordingly fixed the issue:

Resources:
    AWSEBAutoScalingLaunchConfiguration:
        Type: AWS::AutoScaling::LaunchConfiguration
        Properties:
            BlockDeviceMappings:
               - DeviceName: /dev/xvda
                 Ebs:
                     VolumeSize:
                        35
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