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Configuration of fadump (SLES 11 SP3)

This document (7012786) is provided subject to the disclaimer at the end of this document.

Environment


SUSE Linux Enterprise Server 11

Situation

There is no YaST2 module at the moment available to setup the firmware assisted dump (fadump). It has to be done manually and this document is describing how to enable and disable fadump.

Resolution

To enable fadump do the following:

1. in /etc/sysconfig/kdump set

   KDUMP_FADUMP=yes

2. run as user root the command mkdumprd

   mkdumprd -f

3. reboot the system

4. After a reboot verify with

    cat /sys/kernel/fadump_enabled

that this file is available and shows a value of '1'.

This indicates that fadump is enabled in the kernel and the system
 will now use the fadump mechanism to capture a kernel dump.

If after this process the file /etc/sysconfig/kdump is modified again
by any means, be it manually or via YaST, the command

   mkdumprd -f
   
has to be run again to make fadump aware of these changes.


To disable fadump do the following

1. in /etc/sysconfig/kdump set

   KDUMP_FADUMP=no

2. run as user root the command mkinitrd

   mkinitrd

3. reboot the system


Possible problems:

In case of a second kernel failing with "Out of Memory" messages during fadump capture, use 'fadump_reserve_mem=<size>M' kernel cmdline to specify larger size of the memory to reserve for boot memory dump preservation and reboot the system.

The term 'boot memory' means the size of the low memory chunk that is required for second kernel to boot successfully when booted with restricted memory during system crash. By default, the boot memory size will be the larger of 5% of system RAM or 256MB.  Alternatively, a user can also specify the boot memory size through the boot parameter 'fadump_reserve_mem=' which will override the default calculated size.

Disclaimer

This Support Knowledgebase provides a valuable tool for NetIQ/Novell/SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7012786
  • Creation Date:04-JUL-13
  • Modified Date:04-JUL-13
    • SUSESUSE Linux Enterprise Server

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