Run these commands any time that you have the following issues: 

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. 

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: 

GLYPH<SM590000> lscontroller and lsMDisk 

Provides current status of all optional external controllers and MDisks. 

GLYPH<SM590000> detectMDisk 

Discovers the changes in both the IBM FlashSystem 9100 and any optional external back end storage. 

GLYPH<SM590000> lscontroller <controller_id_or_name> 

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. 

GLYPH<SM590000> lsMDisk 

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. 

## 10.6 Health status during upgrade and known error 

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. 

## Known error 

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. 

## 10.7 Call Home Web and Health Checker feature 

Call Home Web is an IBM tool to view Call Home information on the web. 

