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Why is kdump failing on systems with iSCSI storage?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • iSCSI based storage destination
    or
  • iSCSI root installation

Issue

  • Are iSCSI storage targets supported for use with kdump?
  • The kdump service does not work when directed to dump onto an iSCSI target.

  • The kdump service can also fail when configured on systems with iSCSI root.

  • Kdump是否支持iscsi存储

  • 当Kdump的导出目标盘是iscsi盘时，kdump不会工作
  • 当Kdump的root目录是iscsi设备时，kdump也不会工作

Resolution

  • Kdump is not officially supported on iSCSI targets. Please see What targets are supported for use with kdump? for further information on supported targets.

  • To work around this problem, you can use either an NFS or SSH based kdump configuration as described in How do I configure kexec/kdump on Red Hat Enterprise Linux?

  • To implement the NFS or SSH workarounds on an iSCSI root based system, after configuring a kdump target as described above, you should also consider the following:

    • If / and /boot reside on iSCSI storage, set disk_timeout 1 in /etc/kdump.conf (not available prior to Red Hat Enterprise Linux 5.5) to avoid the possibility of kdump hanging if they are not immediately available.

    • If /boot is on a separate partition, add the _rnetdev mount option for /boot in the file /etc/fstab

  • kdump从官方上讲是不支持iscsi设备的。可以参考以下文档来获取更多信息

  • 想要暂时解决这个问题，可以使用nfs或者ssh方法。在完成上述配置之后，以下几点需要注意
    • 如果/或者/boot是iscsi存储，在/etc/kdump.conf里（RHEL5.5以后的版本）把disk_timeout设置成1。这是为了防止kdump不能即使相应而造成的hang机情况
    • 如果/boot是单独分区，在/etc/fstab中/boot的那一行添加_rnetdev参数

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