Knowledge Article: ID B00222000: Standby MM failure on system management bus, check devices

Description

The Chassis Management Module (CMM) has detected a failure on the systems-management bus.

Causes

The Chassis Management Module (CMM) has detected a failure on the systems-management bus.

Implications

A failover was initiated, and the primary CMM is now the standby CMM.

Resolutions

Use one of the following procedures:

1. If active problems are reported in the Chassis Management Moduke log, solve them.
   
2. If no active bus problems are reported in the log, during scheduled maintenance, swap the physical locations of the primary CMM and the standby CMM. If the problems follow the CMM, replace the CMM. Otherwise, replace the device that is reported in the log.

Additional information

To find additional troubleshooting help, visit the "IBM Support & downloads" Web site. At "IBM Support Portal: Quick start" page, select Browse for "Choose your products", select your Chassis from PureFlex System under the Hardware list, and "Troubleshoot" for "Choose your page", then select "Continue" for "See your results". To narrow the results, search with keywords that are related to this article, such as "fail", "Chassis", etc. in the "Search support" field at the right panel.

To download the latest firmware, visit the same "IBM BladeCenter Support search" Web site, select "Download" for "Task", and then select "Product Family", "Machine type" and "Operating system" of interest (from the pull-down lists). You can refine the search by selecting the category of the download of your interest from the "Refine results" list.

To find the replacement part number (or the FRU number) for the component replacement, visit the "BladeCenter and System x Product Information - Servers" Web site, select your product from "IBM BladeCenter products" table. Then select "System service parts listing" for your product.