Requirements for replacing or adding a controller

If you plan to replace a controller or add a second controller, keep the following requirements in mind.

Requirements for adding a second controller

Requirements for replacing a failed controller

Duplex configuration

If the controller shelf has two controllers (duplex configuration), you can replace a controller canister while your storage array is powered on and performing host I/O operations, as long as the following conditions are true:
  • The second controller canister in the shelf has Optimal status.
  • The OK to remove field in the Details area of the Recovery Guru in SANtricity System Manager displays Yes, indicating that it is safe to remove this component.

Simplex configuration

If you have only one controller canister (simplex configuration), data on the storage array will not be accessible until you replace the controller canister. You must stop host I/O operations and power down the storage array.