How do I make kdump use a permissible range of memory for the crash kernel?
- by Philip Durbin
I've read the Red Hat Knowledgebase article
"How do I configure kexec/kdump on Red Hat Enterprise Linux 5?" at http://kbase.redhat.com/faq/docs/DOC-6039 and http://prefetch.net/blog/index.php/2009/07/06/using-kdump-to-get-core-files-on-fedora-and-centos-hosts/
The crashkernel=128M@16M kernel parameter works fine for me in a RHEL 6.0 beta VM, but not on the RHEL 5.5 hosts I've tried.
dmesg shows me:
Memory for crash kernel (0x0 to 0x0) notwithin permissible range
disabling kdump
Here's the line from grub.conf:
kernel /vmlinuz-2.6.18-194.3.1.el5 ro root=/dev/md2 console=ttyS0,115200 panic=15 rhgb quiet crashkernel=128M@16M
How do I make kdump use a permissible range of memory for the crash kernel?