Investigate techniques for CephFS migration
We found that rsync does not consider nanosecond fidelity with atime to be necessary. This means an atime of Access: 2024-04-11 11:53:09.114043000
becomes Access: 2024-04-11 11:53:09.000000000
when the "copy atime" option is used. The reason for this behavior is unknown because nanoseconds are copied for mtime and ctime.
The plan is to meet with the devops and science teams to discuss and brainstorm ideas for how to accomplish the migration with no effect on the data being transferred.