Removing a Member or the Standby

Establish a console session with the stack via direct console cable connection or telnet. If using the console cable, connect it to the Standby.
Enter the following command to remove the switch from the stack:

switch(config)# stacking member N remove

This causes the switch to lose its complete configuration and to be removed from the stack configuration. A subsequent show stacking command issued to the stack will show that the removed switch no longer exists in the stack.
Power down the removed switch.
Disconnect the stacking cables from the removed switch and from the other switches in the stack.

Replacing a faulty member without losing the configuration

You can replace a faulty member from the stack without affecting the switch configuration using the preconfigure command. The following example shows how to change or drop the MAC address of the faulty member in a four member stack using the preconfigure command.

switch(config)# stacking member 4 type JL321A mac-address e0071b-def840
This will save the current configuration. Continue [y/n]?  y

switch(config)# show stack

Stack ID         : 0100e007-1bdab580                                           
          
MAC Address      : e0071b-dab58a    
Stack Topology   : Chain                                   
Stack Status     : Active                                  
Split Policy     : One-Fragment-Up 
Uptime           : 0d 0h 34m   
Software Version : WC.16.04.0000x

Mbr                                                                            
 ID  Mac Address       Model                                 Pri  Status         
 --- -------------    -----------------------------------    ---  ----------
 *1  e0071b-dab580     Aruba JL322A 2930M-48G-PoE+ Switch    128  Commander      
  2  e0071b-de7dc0     Aruba JL321A 2930M-48G Switch         128  Member         
  3  e0071b-de8d00     Aruba JL321A 2930M-48G Switch         128  Standby        
  4  e0071b-def840     Aruba JL321A 2930M-48G Switch         128  Not Joined

After the fourth member boots up:

switch(config)# show stack

Stack ID         : 0100e007-1bdab580                                           
          
MAC Address      : e0071b-dab58a    
Stack Topology   : Ring                                    
Stack Status     : Active                                  
Split Policy     : One-Fragment-Up 
Uptime           : 0d 0h 43m   
Software Version : WC.16.04.0000x

Mbr                                                                            
 ID  Mac Address       Model                                 Pri Status         
 --- ----------------- ------------------------------------- --- ----------
 *1  e0071b-dab580     Aruba JL322A 2930M-48G-PoE+ Switch    128 Commander      
  2  e0071b-de7dc0     Aruba JL321A 2930M-48G Switch         128 Member         
  3  e0071b-de8d00     Aruba JL321A 2930M-48G Switch         128 Standby        
  4  e0071b-def840     Aruba JL321A 2930M-48G Switch         128 Member

NOTE:

Use the command stack member <id> remove reboot to reboot a stack when a stack member is in inconsistent state, and when a failure is also detected.