remove node out of the cluster

 All nodes must be up in order to remove one node. 

What is the status of your node 6 , can you stat it up ?

it show node_state is standby it means node 6 not up 

but the cluster show status UP.

I found this document guide how to remove. and I try to remove node by using MC instead . it cannot click the button

Remove Unused Hosts From the Database Using MC

You remove nodes from a database cluster on MC's Manage page. Click the node you want to act upon, and then click Remove node in the Node List.

Using MC, you can remove only nodes that are part of the database cluster and which show a state of DOWN (red). When you remove a node, its color changes from red to clear and MC updates its state to STANDBY. You can add STANDBY nodes back to the database later.

Hi,

       Can you try resetting the state of Active Standby node before you remove node out of the cluster. Please find the instructions in the below URL

https://my.vertica.com/docs/7.2.x/HTML/index.htm#Authoring/AdministratorsGuide/ManageNodes/RevertingaHotStandbyNode.htm%3FTocPath%3DAdministrator's%2520Guide%7CManaging%2520the%2520Database%7CManaging%2520Nodes%7CActive%2520Standby%2520Nodes%7C_____3

Sruthi

thanks