Rebalancing causing IO Stall/IO Drops to zero

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Hi Everyone,

We keep running into stalled IOs / they also drop almost to zero, whenever a node suddenly would go down or if there was a large amount of rebalancing going on and once rebalancing is completed, we would also get stalled io for 2-10 mins.

Has anyone seen this behaviour before and found a way to fix this? We are seeing this on Ceph Hammer and also on Jewel.

Thanks.

Regards,
Ossi


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