Without knowing the source code and just from my observations, I would say everytime the osd map changes, the crush/pgmap tries to fix that. However a running backfill is not stopped and only backfill_wait would be reconsidered. -- Martin Verges Managing director Mobile: +49 174 9335695 E-Mail: martin.verges@croit.io Chat: https://t.me/MartinVerges croit GmbH, Freseniusstr. 31h, 81247 Munich CEO: Martin Verges - VAT-ID: DE310638492 Com. register: Amtsgericht Munich HRB 231263 Web: https://croit.io YouTube: https://goo.gl/PGE1Bx Am Sa., 26. Sept. 2020 um 13:33 Uhr schrieb Marc Roos < M.Roos@f1-outsourcing.eu>:

When I add an osd rebalancing is taking place, lets say ceph relocates 40 pg's.

When I add another osd during rebalancing, when ceph has only relocated 10 pgs and has to do still 30 pgs.

What happens then:

1. Is ceph just finishing the relocation of these 30 pgs and then calculates how the new environment with the newly added osd should be relocated and starts relocating that.

2. or is ceph is finishing only the relocation of the pg it is currently doing, and then recalculates immediately how pg's should be distributed without finishing these 30 pg's it was planning to do.

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