[ceph-users] Can I create 8+2 Erasure coding pool on 5 node?

Hello. I have 5 node Cluster in A datacenter. Also I have same 5 node in B datacenter. They're gonna be 10 node 8+2 EC cluster for backup but I need to add the 5 node later. I have to sync my S3 data with multisite on the 5 node cluster in A datacenter and move them to the B and add the other 5 node to the same cluster. The question is: Can I create 8+2 ec pool on 5 node cluster and add the 5 node later? How can I rebalance the data after that? Or is there any better solution in my case? what should I do?