Kernel Core Dumps
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Kernel Core Dumps
Changes to the kernel cores should be made by an administrator or individual who is completely familiar
with switch operations.
When a specific module's operating system (OS) crashes, it is sometimes useful to obtain a full copy of
the memory image (called a kernel core dump) to identify the cause of the crash. When the module
experiences a kernel core dump it triggers the proxy server configured on the supervisor. The supervisor
sends the module's OS kernel core dump to the Cisco MDS 9000 System Debug Server. Similarly, if the
supervisor OS fails, the supervisor sends its OS kernel core dump to the Cisco MDS 9000 System Debug
The Cisco MDS 9000 System Debug Server is a Cisco application that runs on Linux. It creates a
repository for kernel core dumps. You can download the Cisco MDS 9000 System Debug Server from
the Cisco.com website at http://www.cisco.com/kobayashi/sw-center/sw-stornet.shtml.
Kernel core dumps are only useful to your technical support representative. The kernel core dump file,
which is a large binary file, must be transferred to an external server that resides on the same physical
LAN as the switch. The core dump is subsequently interpreted by technical personnel who have access
to source code and detailed memory maps.
Core dumps take up disk space on the Cisco MDS 9000 System Debug Server application. If all levels
of core dumps (level all option) are configured, you need to ensure that a minimum of 1 GB of disk space
is available on the Linux server running the Cisco MDS 9000 System Debug Server application to accept
the dump. If the process does not have sufficient space to complete the generation, the module resets
itself. All changes made to kernel cores are saved to the running configuration.
This section includes the following topics:
Cisco MDS 9000 Family CLI Configuration Guide
Configuring External Servers, page 59-11
Configuring Module Parameters, page 59-11
Displaying Kernel Core Information, page 59-11
Monitoring System Processes and Logs
Jan 29 01:55
Jan 29 01:57
OL-16184-01, Cisco MDS SAN-OS Release 3.x