Editing CCU:New GPU Cluster (section)

== Copy data from the old cluster into the new filesystem ==

The shared file system can be mounted as an nfs volume on the old cluster, so you can create a pod which mounts both the new filesystem as well as your PVs from the old cluster. Please use the following pod configuration as a template and add additional mounts for the PVs you want to copy over. Note that if you want to copy over '''local''' PVs which live on different nodes, then you have to create two different pods, as otherwise the mounts conflict and the pod will forever be pending.

<syntaxhighlight>
apiVersion: v1
kind: Pod
metadata:
  name: <your-username>-transfer-pod
  namespace: exc-cb
spec:
  # vecna is a good node as it has the fastest connection to the new file system.
  # however, if you have to copy local PVs, then the pod needs to be on the respective node.
  # nodeSelector:
  #   kubernetes.io/hostname: vecna
  containers:
  - name: ubuntu
    image: ubuntu:20.04
    command: ["sleep", "1d"]
    volumeMounts:
      - mountPath: /abyss/shared
        name: cephfs-shared
        readOnly: false
  volumes:
    - name: cephfs-shared
      nfs:
        path: /cephfs/abyss/shared
        server: ccu-node1
</syntaxhighlight>

Afterwards, run a shell in the container and copy your stuff over to /abyss/shared/users/<your-username>. The following should do the trick. Note that this is not a secure directory as everyone has full read/write access, so copy over to your own home directory on the new cluster as soon as possible. 

<syntaxhighlight>
> kubectl exec -it <your-username>-transfer-pod /bin/bash
# cd /abyss/shared/users/<your-username>
# cp -r <all-my-stuff> ./
</syntaxhighlight>