Make sure your system image is current before scaling out. Having a current system image also reduces errors during the node failure recovery process.
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Verify the system image is current.
# tdc-image --ami-status
If the system image is current, the following appears and no further action is needed.System AMI is up to date
If the system image is not current, the following appears and you must create a new system image.System AMI is out of date. Please create a new system AMI.