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Backup or clone may fail for applications using PVCs with decimal units in Astra Control Center

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Applies to

  • Astra Control Center 
  • Application Backup using Astra Control Center 
  • Application Clone using Astra Control Center 
  • Trident ontap-nas driver 

Issue

  • An application backup or clone may fail if all the following are true: 
  1. A Kubernetes PersistentVolumeClaim (PVC), VolumeClaimTemplate, or Helm install is created with a volume  size using the International System of Units (SI)/base 10/decimal units (e.g. K, M or G symbols) 
  2. The Trident ontap-nas driver is used to create the volume  
  3. The Persistent Volume Claim (PVC) is attached to a Kubernetes application being managed by Astra 
  4. The PVC within the backup namespace (namespace running the backup pod)  in the original cluster will display a similar error message as seen below. 

kubectl describe pvc <pvc-name> -n <backup namespace name> 

  Warning  ProvisioningFailed    22m (x11 over 27m)     csi.trident.netapp.io_trident-csi-678955886c-9r7mz_1ee2b9b4-d28b-43f1-800e-be43820fdb99  failed to provision volume with StorageClass "ontap-gold": error getting handle for DataSource Type VolumeSnapshot by Name pvc-db35f9ac-41d1-44e2-91f9-01bec673b00c-snap-e8d4ade8-221a-4328-b8ef-dc800ee91d9b-pvc-ifwqo: requested volume size 10000000000 is less than the size 10000003072 for the source snapshot pvc-db35f9ac-41d1-44e2-91f9-01bec673b00c-snap-e8d4ade8-221a-4328-b8ef-dc800ee91d9b-pvc-ifwqo 

  • The same issue occurs if the application is installed via a Helm Chart or a custom manifest.  

 

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