In docs, I found the following statement:
IMPORTANT Always use filesystem snapshots to create a copy of a member of the existing replica set. Do not use mongodump and mongorestore to seed a new replica set member.
- what do I have to do if my FS does not support snapshots, and
- why is this limitation here at all? Earlier, it was possible to use mongodump-generated snapshots to add new rs members (edit: if I'm not mistaken).