Hi,

We have oklog v0.3.0 running in docker. I'm mounting external disk on /data. After while I get below error:

ts=2018-03-22T11:27:58.697719584Z level=info ingest_path=data/ingest
during recovery: rename data/store/0093a279-2977-42ec-b9d3-7771d4551950.active 01C96FFQG2W35WWA9VMPKCGCG1-01C96FFTAXR3F5QW47JTJGRQPS.flushed: invalid cross-device link

I know this is because it tries to use os.Rename cross disks, however I'm not fully understanding why oklog want to move file outside data folder (which is disk on it's own). I could replace Rename method to handle it with io.Copy instead, but best solution would be to avoid moving files outside data folder in first place.