IBM Support

KDump and FADump fail to capture dump to VFC or FC backed multipath raw disk

Flashes (Alerts)


Abstract

Power systems with Virtual Fibre Channel (FC) or Physical FC adapters might fail to capture a dump if multipath “user_friendly_names” is enabled. This failure is applicable to Red Hat Enterprise Linux (RHEL) 8 and 9 and SUSE Linux Enterprise Server (SLES) 15.

Content

Linux Releases Affected
RHEL 8.10, 9.2, and 9.4
SLES 15 service pack (SP) 6
 
IBM Systems Affected
All POWER systems with Virtual or Physical FC adapters.
 
Symptoms
When you capture a dump by using KDump or FADump to a multipath raw disk, the capture kernel might use the wrong device node to identify the target disk. This operation causes the capture to fail and the system might hang.
Workaround

Disable the user friendly names setting for multipath by setting the user_friendly_names value to 'no' in the /etc/multipath.conf file. Rebuild the initrd for the dump capture kernel by using the following commands, and then restart the system.

kdumpctl rebuild
kdumpctl reload
Fix Outlook

IBM is working with Red Hat and SUSE to resolve this issue in RHEL 9 and SLES 15. The alert will be updated when a fix is available.

I/O device impacted

All Fibre Channel devices.

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Document Information

Modified date:
26 April 2024

UID

ibm17148496

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