After a stack of S series fixed switches splits, the split stacks merge. Do I need to power off the master and standby switches

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You do not need to power off the master and standby switches when stacks of S series fixed switches merge. You are advised to add a new switch to a stack during service idle time. Power off the new switch, configure the stack function on the switch, connect stack cables, and then power on the switch.

Other related questions:
Split stacks of S series fixed switches
Split a stack of S series fixed switches that is established in stack card connection mode as follows: 1. Run the save command to save the configuration. 2. Run the copy source-filename destination-filename all command to back up the configuration file to all the member switches. 3. Remove stack cables between the member switches. After the stack cables are disconnected, the stack splits. Part of the member switches restart. Remote login may fail because configurations such as the IP address of the stack member switches are the same. Log in to a switch through the console port and perform the following operations. 4. Run the system-view command to enter the system view. 5. Run the stack slot slot-id renumber 0 command to restore the stack ID of the member switch to the default value 0. 6. Power off all the member switches. 7. Remove the stack card. Split a stack of S series fixed switches that is established in service port connection mode as follows: 1. Run the save command to save the configuration. 2. Run the copy source-filename destination-filename all command to back up the configuration file to all the member switches. 3. Remove stack cables between the member switches. After the stack cables are disconnected, the stack splits. Part of the member switches restart. Remote login may fail because configurations such as the IP address of the stack member switches are the same. Log in to a switch through the console port and perform the following operations. 4. Run the system-view command to enter the system view. 5. Run the interface stack-port member-id/port-id command to enter the logical stack port view. 6. Run the shutdown interface { interface-type interface-number1 [ to interface-type interface-number2 ] } &<1-10> command to disable the physical member port. 7. Run the undo port interface { interface-type interface-number1 [ to interface-type interface-number2 ] } &<1-10> enable command to restore the physical member port to a service port. 8. Run the quit command to exit from the logical stack port. 9. Run the stack slot slot-id renumber 0 command to restore the stack ID of the member switch to the default value 0. 10. Power off all the member switches. Note: Steps 5 to 7 are performed to restore a stack port to a service port, and the operations are performed based on versions later than V200R002. For details about configuration in V200R002 and earlier versions

Whether the configuration of an S series fixed switch stack changes after the stack splits
After a stack is set up, all stack member switches function as one switch on a network. The configuration of the stack is the configuration of the master switch, which is synchronized to the standby switch by the master switch. If a fault occurs on the master switch and the master switch restarts, the standby switch does not restart and function as the master switch. That is, the configuration of the stack does not change.

Restore the factory settings of S series switches after a stack splits
To restore the factory settings of an S series switch (except the S1700) that has not joined any cluster or stack, run the reset saved-configuration and reboot fast commands, and select N when the system asks you whether to save configurations. After a switch joins a stack, the stack configurations, including the stack ID, Stack priority, and stack port configuration, are not saved in the configuration file and cannot be deleted by the preceding operations. In this case, to restore the factory settings of a switch, disable all the stack configurations, then run the reset saved-configuration and reboot fast commands, and select N when the system asks you whether to save the configurations.

How to split a CE switch stack
If a stack is not required, split the stack to restore the member switches to standalone switches.
Split a CE12800 stack.
1. Disable the CSS function. After the CSS function is disabled, the member switches restart without a configuration file and automatically back up the CSS configuration file used before the CSS splits.
system-view
[~HUAWEI] stack
[~HUAWEI-stack] undo stack enable memeber all
2. Remove stack cables.

Split a stack of CE8800&CE7800&CE6800&CE5800 switches.
1. Back up the stack configuration file in case that the stack will be used again.
copy stack.cfg stack_copy.cfg all
2. Clear the configuration file for next start and restart the switch.
reset saved-configuration
The configuration will be erased to reconfigure.Continue? [Y/N]: y
reboot
Warning: The current configuration will be saved to the next startup saved-configuration file. Continue? [Y/N]: n
Warning: The system will reboot. Continue? [Y/N]: y
3. Remove stack cables.

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