Adding osds to each nodes

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What is the safest way to add disk(s) to each of the node in the cluster?
Should it be done 1 by 1 or can add all of them at once and let it rebalance?

My concern is that if add all in one due to host based EC code it will block all the host.
The other side if I add 1 by 1,  one node will have more performance and more osds than the others which is also not a good setup, so wonder which is the safer way?

(have 9 nodes with host based EC 4:2, 1 disk is going to have 4osds)

Thank you

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