Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 442

Failure and Event Logging Dell Networking systems provide multiple options for logging failures and events. Trace Log To track the execution of a program, developers interlace messages with software code. These messages are called trace messages and are primarily used for debugging and to provide lowerlevel information than event messages, which system administrators use. Dell Networking OS retains trace messages for hardware and software and stores them in files (logs) on the internal flash. • Trace Log - contains trace messages that relate to software and hardware events, state, and errors. Trace Logs are stored in internal flash under the directory TRACE_LOG_DIR. • Crash Log - contains trace messages that relate to IPC and IRC timeouts and task crashes on linecards and are stored under the directory CRASH_LOG_DIR. Core Dumps A core dump is the contents of RAM a program uses at the time of a software exception and identifies the cause of the exception. There are two types of core dumps: application and kernel. • Kernel core dump - the central component of an OS that manages system processors and memory allocation and makes these facilities available to applications. A kernel core dump is the contents of the memory the kernel uses at the time of an exception. • Application core dump - the contents of the memory allocated to a failed application at the time of an exception. System Log Event messages provide system administrators diagnostics and auditing information. The Dell Networking OS sends event messages to the internal buffer, all terminal lines, the console, and optionally to a syslog server. For more information about event messages and configurable options, see Switch Management. Control Plane Redundancy The switch eliminates single points of failure by providing dedicated or load-balanced redundancy for various components. To configure redundancy features, use the following commands. Table 34. Commands to configure Control Plane redundancy Command Description redundancy autofailover-limit redundancy primary (rpm0 | rpm1) Limits the number of failovers for a specific period. Select preferred RPM as primary. 442 High Availability (HA)