[Lustre-discuss] Deactivated OSTs and object placement

Arne Wiebalck arne.wiebalck at cern.ch
Fri Oct 2 07:27:10 PDT 2009


Dear list,

when I

- create a file striped over all OSTs
- deactivate one OST (lctl set_param osc....active=0) on the MDS
- open, write, close that file

I have no more objects of that file on the deactivated OST. I also
noticed that all object IDs have changed.

Equivalent behavior when I re-activate the OST (and do the open,
write, close cycle): the file is fully striped again.

Is Lustre recreating my file, i.e. re-shuffling the objects?

TIA,
  Arne
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