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Yes it can be overridden via the chart values - https://github.com/runatlantis/helm-charts/blob/main/charts/atlantis/values.yaml#L328

I did try increasing the value form 5Gi to 15Gi, but when I do a helm upgrade it gives the forbidden error

Forbidden: updates to statefulset spec for fields other than 'replicas', 'template', 'updateStrategy', 'persistentVolumeClaimRetentionPolicy' and 'minReadySeconds' are forbidden

Kubernetes does not allow modification of dataStoarge

If you are doing an in-place upgrade, its more involved as you will need to check if the PVC class allows for volume expansion and manually edit the PVC before attempting the recreate the StatefulSet

I am trying to run the helm upgrade command to deploy the helm values.yaml file . I have used the AWS EKS cluster to deploy atlantis and i see that PVC does not support volume expansion

Then you cannot expand volume, you will need to destroy and recreate

destroy and recreate as in the whole EKS cluster ?

no the Atlantis deployment

Ok. In that case, I would be able to change the value of dataStorage accordingly ?

yes, you redeploy with the bigger size

Ok. Let me try that . Thanks you