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------- Comment From thorsten.diehl@xxxxxxxxxx 2016-05-10 04:13 EDT-------
Hi Louis,

it's easier than expected:
If you kexec with cio_ignore as proposed above, 128M will be enough for both z/VM and LPAR. And to ease it up, you can use that cio_ignore mechanism in /etc/default/kdump-tools for z/VM and LPAR.

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https://bugs.launchpad.net/bugs/1570775

Title:
  makekdump should re-exec with cio_ignore on s390x

Status in Ubuntu on IBM z Systems:
  Confirmed
Status in makedumpfile package in Ubuntu:
  Confirmed

Bug description:
  As per
  https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1564475/comments/19

  We should re-exec with cio_ignore lines. As per report there, it
  should result in lowered required crashdump setting.

  Hypothetically, one should be able to test this imperially by lowering
  crashdump memory settings until kdump does not succeed anymore. And
  then generated and append `cio_ignore -k -u` to the
  KDUMP_CMDLINE_APPEND= and see that kdump starts working again with a
  lower memory usage.

  Once this is developed / verified / tested, we should probably SRU
  this back to xenial.

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