Run these commands any time that you have the following issues: Important:  Run these commands when back-end storage is just configured, a zoning  change occurs or any other type of changes related to the communication between IIBM  FlashSystem 9100 and any external back-end storage subsystem happens. This ensures  that IBM FlashSystem 9100 has recognized the changes. Common error recovery involves the following IBM FlashSystem 9100 CLI commands: Provides current status of all optional external controllers and MDisks. Discovers the changes in both the IBM FlashSystem 9100 and any optional external back  end storage. Checks the controller that was causing the issue and verifies that all the WWPNs are listed  as you expect. It also checks that the  path_counts  are distributed evenly across the  WWPNs. Determines whether all MDisks are now online. Note:  When an issue is resolved using the CLI, check if the error has cleared from the  Monitoring  Events  panel. If not, make sure the error has been really fixed, and if so,  manually mark the error as fixed. It’s important to understand that during the software upgrade process, alerts indicating the  system is not healthy are reported. This is a normal behavior because the IBM FlashSystem  9100 node canisters go offline during this process, so the system triggers these alerts. While trying to upgrade an IBM FlashSystem 9100, you might get a message such as  Error  in verifying the signature of the update package . This message does not mean that you have an issue in your system. Sometimes this  happens because there is not enough space on the system to copy the file, or the package is  incomplete or contains errors. In this case, open a PMR with IBM support and follow their  instructions. Call Home Web is an IBM tool to view Call Home information on the web. 10.7 Call Home Web and Health Checker feature Known error 10.6 Health status during upgrade and known error GLYPH<SM590000> You experience an optional back-end storage issue (for example, error code 1370 or error  code 1630). GLYPH<SM590000> You performed maintenance on the optional back-end storage subsystems. GLYPH<SM590000> lscontroller and lsMDisk GLYPH<SM590000> detectMDisk GLYPH<SM590000> lscontroller <controller_id_or_name> GLYPH<SM590000> lsMDisk Chapter 10. Troubleshooting and diagnostics  381