Ubuntu
makedumpfile package

  1. Bug #1564475
  2. Comment #22

Comment 22 for bug 1564475

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2016-04-15 09:39 EDT-------
well, here my complete proposed wording:

Depending on the number of available devices the amount of memory specified by the "crashkernel" kernel parameter in /etc/zipl.conf may not be sufficient. One can either increase it further, or limit the amount of devices visible to the kernel, and thus lower the requirements for the "crashkernel" setting.

To ignore devices you can run the "cio_ignore" tool to generate an appropriate stanza to ignore all devices, except the currently active/in-use.

$ sudo cio_ignore -u -k
cio_ignore=all,!c000-c002,!e000,!e100

You can simply add the "cio_ignore" kernel parameter with the stanza from above to KDUMP_CMDLINE_APPEND in /etc/default/kdump-tools and activate the setting with "systemctl restart kdump-tools.service".

As an alternative which blacklists the channel devices also for the production system, you can add the generated stanza to the boot parameters in /etc/zipl.conf. To activate the setting call "zipl -V" and then reboot the system.