How do I make kdump use a permissible range of memory for the crash kernel?

Posted by Philip Durbin on Server Fault See other posts from Server Fault or by Philip Durbin
Published on 2010-05-11T15:33:18Z Indexed on 2010/05/11 15:44 UTC
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kdump

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rhel

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linux

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kernel

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redhat

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?

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