[MTC] Migrating from RHOCP 3.11 to RHOCP 4.8 fails when using NFS StorageClass backed by Trident/Netapp CSI and rsync

Issue

• Migration Toolkit for Containers (MTC) is failing when migrating pvc/nfs-trident between two OpenShift clusters:
  • Source cluster is v3.11 and Destination cluster is v4.8.
  • Failures in rsync operation can be seen: rsync error: some files/attrs were not transferred (see previous errors) (code 23).
• This only happens when the StorageClass is Trident (Netapp) NFS:
  • NFS v3 and v4 are both affected.
  • Other storage (such as vmdk/VMWare) does not seem to be affected.
• Other services that use Trident-based volumes (such as backup processes) work as expected.
• rsync tries to copy a directory .snapshot that does not exit on Source cluster.
• Other workloads using the Trident StorageClass are not showing incorrect behavior. This only seems to happen with MTC workloads.