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Imagestream Export or Restore Fails With "error writing layer: no space left on device"

KB ID: 4633
Product: Veeam Kasten for Kubernetes | 7
Published: 2024-06-26
Last Modified: 2024-06-26
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Challenge

Export Action or Restore Action of OpenShift Imagestream fails with the following error:

Failed to exec command in pod: command terminated with exit code 1.stdout: error writing layer: write/var/lib/image/<id>/blobs/sha256/<id>: no space left on device

Cause

During the export or restore of an image stream, a temporary persistent volume will be created using the default storage class. In some instances, the allocated size of that temporary intermediate volume created for exporting or restoring images is insufficient for the intended image size. This can result in a “no space left on device” error. In such a situation, the default value of ephemeralPVCOverhead of 0.1 is insufficient.

Solution

Increase the value of ephemeralPVCOverhead as needed. By default, it is 0.1, and it can be increased as needed.

For example, to increase it to 0.2, the following commands would be used:

helm get values k10 --output yaml --namespace=kasten-io > k10_val.yaml && \
helm upgrade k10 kasten/k10 --namespace=kasten-io -f k10_val.yaml \
--set ephemeralPVCOverhead=0.2 --version=<current k10 version>
The updated value can be verified with the following command: 
kubectl get cm k10-config -oyaml -n kasten-io | grep -i K10EphemeralPVCOverhead

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