In a mix cluster with 181 and 200 nodes, from the UI of 200, not able to see Disk Usage stats.

When I do the online upgrade, I find this problem

10.6.2.66 is 181 node. The rest are 2.0 nodes.
I rebalance in 10.6.2.67 and rebalance out 10.6.2.66

When I click the arrow in front of the ip of 181 node (please see the pic1 I attached), nothing shows.
After sometime, these arrows in front of the ip are disabled. (see the pic2)