I realised this operation with no impact using this way :
1- I duplicated the rule used by my pools and give it the number of the new
corresponding rule in the new crushmap
2- I set the noout
3- I set the new crushmap
4- I unset the noout
Everything was fine (i already had set max_backfill and ot
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I'm not aware of a way of slowing things down other then modifying
osd_max_backfills, osd_backfill_scan_{min,max}, and
osd_recovery_max_activate as mentioned in [1]. The nature of injecting
a new CRUSH map us usually the result of several changes and
