IBM Support

Disable NMI watchdog during LPM

Flashes (Alerts)


Abstract

When the live partition mobility (LPM) is initiated, it might introduce latencies during memory accesses on the target side. This operation might trigger the NMI watchdog and display hard lockup on the console of the LPAR. In addition, the Hardware Management Console (HMC) might report that the LPAR restarted during the LPM, which is incorrect.

Content

Linux Releases Affected
SUSE Linux Enterprise Server (SLES) 15, Service Pack 4
Red Hat Enterprise Linux (RHEL) 9.0

IBM Systems Affected
All IBM Power Systems

Symptoms
The LPAR is reporting hard lockups when running on the target side and the memory transfer is still in progress.

Workaround

You can disable the NMI watchdog before you initiate the LPM. You can run the following command to disable the watchdog:

sysctl kernel.nmi_watchdog=0

Fix Outlook

None.

I/O Device Impacted

Network connections might be impacted during the LPM.

[{"Type":"MASTER","Line of Business":{"code":"LOB26","label":"Storage"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SGMV157","label":"IBM Support for Red Hat Enterprise Linux Server"},"ARM Category":[{"code":"a8m0z000000GnlCAAS","label":"SUSE Linux Enterprise Server"}],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions"}]

Document Information

Modified date:
28 June 2022

UID

ibm16597547

Page Feedback