After a user removes the two controllers of the backup storage device, the service network connection is down and the user fails to log in to DeviceManager and can only enter the minisystem mode of the storage.
The user cannot log in to DeviceManager and can only enter the minisystem mode on the CLI. The service network connection is down and the storage system cannot be started properly.
1. Enter the CLI using SSH. The CLI enters the minisystem mode.
2. Run the showsystrace command to view the control processes of the system, and identify the failed processes and record their IDs (for example, ID: 2).
3. Run showsystrace ID (2) to view the failed step of the process.
4. Run the showsysstatus command to query the storage system status. If the status is not normal, the storage system is not started properly. Record the ID of the primary controller (local node ID: line number).
5. Clear dirty data in the cache. Run the cleardb command to clear database data on all controllers.
6. Run the sys.sh clearvnodedirtydataflag ID (node number) command repeatedly to clear flags of the dirty data on specified virtual nodes (whose node numbers are 0, 1, 2, and 3).
7. Run the sys.sh cleardirtydataflag command to clear flags of the dirty data on the current engine.
7. Run the ccdb.sh -c clearccdb all command to clear the CCDB data of all nodes.
8. Power off the device and then power on it, or run the rebootsys command to restart the device.
9. Wait for more than 10 minutes and run the showsystrace command to view the status of the system control processes: If all control processes are successful, the device is started properly. Otherwise, contact R&D engineers for support.
10. Configure services on the device because all service data is cleared.
When both controllers of the storage are removed, dirty data is generated, links are down, and the storage system becomes faulty. As a result, the storage cannot be powered on properly.
This method applies only to storage devices without service running, and the storage systems contain dirty data that needs to be cleared. For storage devices with service running, contact R&D engineers for troubleshooting.