# How to change zones safe on a big cluster

Hello!

I have a big cluster with the next zones on disks (10 disks for each node):

Current configuration:

1 node: 1 1 2 2 1 1 2 2 3 3
2 node: 3 3 4 4 4 4 5 5 6 6
3 node: 11 11 12 12 13 13 14 14 15 15
4 node: 16 16 17 17 18 18 19 19 20 20


I wish to have the next configuration:

Acceptable configuration:

1 node: 1 1 1 1 1 1 1 1 1 1
2 node: 2 2 2 2 2 2 2 2 2 2
3 node: 3 3 3 3 3 3 3 3 3 3
4 node: 4 4 4 4 4 4 4 4 4 4


Initial configuration quite wired because of experimental scripts and lack of experience. Now I have more than 100 TB on a cluster and I need the easiest way to rebalance that.

I know that I should reset disks weight and remove-add entry in the ring to change the zones. But what is the most acceptable algorithm to make process as smoothly as possible?