Changing coordinator of a FlashSystem grid

FlashSystem grid enables you to change the existing coordinator system and make another member system from the grid as the new coordinator.

Changing FlashSystem grid coordinator

To change the coordinator of a FlashSystem grid by using the management GUI, go to FlashSystem grid > Storage systems page. From the overflow menu of the member system that you want to set as the new coordinator, select Assign as coordinator.
Note: Changing a member system to coordinator in a FlashSystem grid by using the management GUI is possible only from the current coordinator system of the grid.
You can also use the managegrid command to change the coordinator of a FlashSystem grid and set another member system from the grid as coordinator. To change the coordinator of a FlashSystem grid, run the managegrid -makecoordinator command on the member system that you want to assign as new coordinator of the grid.
Note: If the current coordinator system in a FlashSystem grid is offline or unreachable, you can change the coordinator by using the managegrid command only.

Guidelines for FlashSystem grid coordinator change

Changing a FlashSystem grid coordinator when the existing coordinator system is online
  • Ensure that all the member systems in the FlashSystem grid are online and reachable.
  • Verify the code or firmware level of each member system in the FlashSystem grid to ensure that all member systems support the coordinator change operation.
  • If any member systems in the FlashSystem grid do not support the coordinator change operation or are unreachable, remove such member systems from the grid.
Changing a FlashSystem grid coordinator when the existing coordinator system is offline
To change the coordinator system in a FlashSystem grid when the current coordinator is offline, ensure that:
  • All online member systems in the grid support the coordinator change operation, and
  • The remaining member systems in the grid are either in invalid_grid_membership state or unreachable.
  • Select a member system with the latest FlashSystem grid information as the new coordinator. Use to the lsgridsystem command to check the values of the grid_gen_num parameter to verify the system with the latest grid information.
  • If any online member systems in the FlashSystem grid do not support the coordinator change operation, then run the managergrid -leave command on such member systems.
  • On the member system that is selected to be the new coordinator, run the managegrid -makemecoordinator -removeinvalidmembers command:
    • To remove other unreachable or invalid member systems from the FlashSystem grid, and
    • To assign the selected member system as new the new coordinator.
    This command also removes the old coordinator system that is unreachable.
To join a FlashSystem grid or to create a new FlashSystem grid from unreachable systems that were removed in the coordinator change operation, run the managergrid -leave command after the systems are back online.
Note: Do not initiate multiple coordinator change requests simultaneously as it can result in a forced new FlashSystem grid creation.