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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.

  1. what do I have to do if my FS does not support snapshots, and
  2. 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).
Sergey Grechin
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  • it looks like i was wrong. It was never possible to use mongodump-generated data to seed a RS member. If you attempt to do that - the instance will raise an error and do full-resync. Probably mongodump doesn't catch (even with oplog recording enabled) certain things needed to start replicating. For me, then, it's needed simply to let it do a full sync. – Sergey Grechin Jan 20 '16 at 13:29

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