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Rolling Back the Storage System
If controllers fail to be expanded, restore the storage system to factory settings.
When handling controller expansion failure, remove cables of storage systems that have not been added to the cluster to isolate controllers.
Procedure
- Roll back controller expansion in the original storage system in normal mode.
- Run the change user_mode current_mode user_mode=developer command to go to the developer view.
- Run the debug command to go to the engineer view.
- Run the sys showcls command to query the total number of controllers in the cluster, as shown in the following figure. node cfg indicates the total number of controllers in the cluster.
admin:/diagnose>sys showcls mode : normal status : none node cfg : 2 node max : 8 group cfg : 1 group max : 4 product : 0 serial : 2102350SHW10G3000001 WWN : 0x2100e4a8b63bd03e local node id : 0 normalNodeBitmap : 3 faultNodeBitmap : 0 offlineNodeBitmap: 0 standbyNodeBitmap: 0 id role status -------------------- -------------------- -------------------- 0 master normal 1 slave normal group engine nodeSessionID -------------------- -------------------- -------------------- 0 0 1 0 0 1 - Run the exit command to exit the diagnose view.
- Run the change user_mode current_mode user_mode=engineer command to go to the engineer view.
- Run the change controllers_expansion cancel controller_total=m command to roll back controller expansion.
In the command, m indicates the total number of controllers in the original cluster.
Do not restart the controllers to minimize the impact on cluster services.
- Perform the operations described in Clearing the Controllers That Failed to Be Added.
