The following steps are required to remove web-server:
Select menu item 8. Manage web nodes in the pool > 4. Remove web role from server::
Enter server host name, which web role is to be deleted (for example server3):
Attention!! Only type spare web-role can be deleted, web-role type main (server with balancer) cannot be removed.
Wait until the task of role removal is completed.
As a result, from 3 web-servers, only 2 will have a web-role (main - server1, spare - server2):
Attention! Task execution may take a rather long time (up to 2-3 hours and more) depending on the task complexity, data volume used in such tasks, capacity and server load. You can check the currently executed tasks by using menu item 5. Background tasks in the pool > 1. View running tasks. If task completion log files are needed to be reviewed, they are located in the following directory /opt/webdir/temp.