Problem determination and recovery

Several tools are available that the trained service representative can use to identify and recover from problems.

Trained service representatives use error logs, Unit Reference Code tables, and maintenance analysis procedures (MAPs) in problem determination and recovery procedures.

Note: The procedures contained in this section are intended for service representatives specifically trained on the system unit and subsystem that is being serviced. Additionally, some of the service actions in this topic might require involvement of the system administrator. For additional sources of related service procedures required to service this subsystem, see relatedpubs.htm.

If a problem arises related to disk arrays and associated physical disks, use the following to identify the problem:

ipr error log entries associated with the problem, viewed using the Analyze Log option in iprconfig or directly from /var/log/messages
Disk array and physical disk status, viewed using the iprconfig utility

Entries in the error log contain a Unit Reference Code (URC) and a description of the problem. Each URC corresponds to an action that should be taken. It is sometimes recommended that you perform a MAP to further determine what actions should be taken to resolve the problem.

This topic collection provides many of these MAPs. The MAPs are intended to address only problems directly related to disk arrays and SAS cabling problem isolation. MAPs related to other device or adapter problems, when applicable, are located in other Linux or system documentation.

Last updated: Wed, May 24, 2017