Fault symptom:
How to replace Data Mover? What operations do I need to change? How to manually switch Data Mover?
Solution:
1. When we want to change the Data Mover, make sure that the DM is not Active. Otherwise, the application cannot be accessed.
2. Log on to the Control Station using SSH. The default user name is nasadmin and the password is nasadmin.
3. Enter nas_server-l to check the status of all Data movers. Confirm that the Data Mover status type1 to be replaced is active type4 and standby. Example:
4. There are two ways to change active DM to standby
First, directly transmit the "panic" command to DM to simulate hardware faults. Specific commands:/nas/sbin/t2tty-c "panic" such: after the/nas/sbin/t2tty-c 2 "panic" command is entered, Timed out is returned, indicating that the current DM cannot be accessed, as shown in the figure:
Second, use common commands to switch between active DM and standby. The specific command is: server_standby <DM name to be fail>-activate mover
For example, after the server_standby server_2-activate mover operation, the following figure shows:
5. After the operation is complete, enter nas_server-l to view the DM status:
You can see that the DM2 name has changed to server_2.faulted.server_4, the type has changed to 4, and the DM4 name has changed to server_2. This indicates that the switchover is complete. At this time, you can remove and replace DM2.
6. After replacing the DM, the system will not automatically set the new DM to active. You must manually enter the following command:
Server_standby <name of the active status DM needed>-restore mover
Example: server_standby server_2-restore mover
As shown in the following figure:
7. Use nas_server-l to check whether all DM statuses have been restored.
