Thank you
But the algorithms used during backfilling and during rebalancing (to decide where data have to be placed) are different ?
I.e. assuming that no new data are written and no data are deleted, if you rely on the standard way (i.e. backfilling), when the data movement process finishes (and therefore the status is HEALTH_OK), can the automatic balancer (in upmap mode) decide that some data have to be re-moved ?
Thanks, Massimo
On Wed, Sep 11, 2019 at 12:30 PM Stefan Kooman <stefan@xxxxxx> wrote:
Quoting Massimo Sgaravatto (massimo.sgaravatto@xxxxxxxxx):
> Just for my education, why letting the balancer moving the PGs to the new
> OSDs (CERN approach) is better than a throttled backfilling ?
1) Because you can pause the process on any given moment and obtain
HEALTH_OK again. 2) The balancer moves the data more efficiently. 3) the
balancer will avoid putting PGs on OSDs that are already full ... you
might avoid "too full" PG situations.
Gr. Stefan
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