SG rebalance.

[ripe vortex]

Does this process happen organically ever or is it something that must be manually kicked off?

[deep trellis]

It has to be initiated as far as I know.

(https://docs.netapp.com/us-en/storagegrid/expand/considerations-for-rebalancing-erasure-coded-data.html)

It redistributes the EC fragments among the nodes