Reduce the size of a kernel dump file
This document (7006319) is provided subject to the disclaimer at the end of this document.
SUSE Linux Enterprise Server 12
If the dump file needs to be transferred somewhere else for analysis, the transfer or upload might take a very long time, and you may wish to reduce the size of the file.
You need to install the kernel debuginfo RPM, matching the same kernel version and flavor of the kernel, the dump file was taken from. Then run makedumpfile specifying another dump level to produce a new smaller dump file. Here's an example of the command:
makedumpfile -d 31 -x /usr/lib/debug/boot/vmlinux-4.12.14-122.136-default.debug /var/crash/2022-11-17-17\:41/vmcore /tmp/vmcore-reduced
-d lets you specify the dump level. The smallest, 31, is sufficient for analysis in most cases. The support engineers may ask for this value to be changed if required for a specific case.
-x specifies the location of the vmlinux debug file. After the installation of the kernel debuginfo RPM, the vmlinux debug file (vmlinux-kernelversion-kernelflavor.debug) is located per default in /usr/lib/debug/boot.
The vmlinux file is followed by the dump file location as specified in KDUMP_SAVEDIR in /etc/sysconfig/kdump .
The last parameter is the new, stripped down version of the dump file.
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- Document ID:7006319
- Creation Date: 21-Jun-2010
- Modified Date:17-Nov-2022
- SUSE Linux Enterprise Server
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