System fails to reboot automatically after installing SLES15 SP6

This document (000021533) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15 SP6

Situation

On a system with software RAID1 the system does not automatically reboot after the SLES15 SP6 installation finishes.
The following is displayed on the screen:

starting yast...
Starting Installer
Probing connected terminal...

Initializing virtual console...

Found a Linux console terminal on /dev/console (128 columns x 48 lines).
Sampling every 5 s to /var/log/YaST2/memsample.zcat
*** Starting YaST ***
WARNING: Nokogiri was built against LibXML version 2.9.14, but has dynamically loaded 2.10.3

On another console (shell) "cat /proc/mdstat" shows that the RAID1 resync is still in progress.
For example:

Personalities : [raid1]
md127 : active raid1 nvme0n1p1[0] nvme1n1p1[1]
      1279262720 blocks super 1.2 [2/2] [UU]
      [===================>.]  resync = 97.5% (1247559552/1279262720) finish=2.5min speed=205925K/sec

unused devices:

The resynchronization process in the above example began at 20% and required over 90 minutes to finish, after which the system automatically rebooted.

Resolution

As temporary workaround wait for the RAID1 resync to complete in the background.

Monitoring the progress with "cat /proc/mdstat" will show the progress and remaining time until completion.
The time it takes for the system to reboot depends on the size of the software RAID1 VD.
The system will reboot once the resync is complete.

The QU1 (Quarterly Update) ISO released in September, 2024 contains the patch to resolve the problem.

More details about the Quarterly Update and how to access it are available in this article:

"SUSE Linux Enterprise Server Quarterly Update ISOs"

Cause

The installer holds the reboot until the RAID1 sync is complete.

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.