On the ISM, log in to the S2600 controller A to upgrade the controller software (from V100R001C02SPC010 to V100R002C01SPC001), but the upgrade fails and the ISM exits automatically. Log in to either controller on the ISM, but the login fails.
On the CLI, logging in to controller A fails but controller B succeeds. Run the showsys command and find that the controller versions are inconsistent, that is, controller A fails to be upgraded and remains in the previous version. Therefore, coffer disks need to be replaced to synchronize the controller versions.
The single controller upgrade failure is possible to occur on the ISM. Therefore, it is recommended to upgrade the S2600 dual controllers on the CLI.