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  1. OpenShift Bugs
  2. OCPBUGS-74911

dm-mpath-root is not recognized by RHCOS when deploying OCP with ABI on baremetal (with FC SAN) and diskEncryption enabled

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      Before this update, the agent-based installer set the `root=/dev/disk/by-label/dm-mpath-root` kernel argument when installing to a multipath Fibre Channel volume. However, the filesystem labels were truncated to 12 characters in the `xfs` parameter. As a consequence, after an installation to an encrypted multipath Fibre Channel volume, the hosts did not boot successfully because the root volume could not be found. With this release, the kernel argument is removed because it is unnecessary. As a result, the hosts boot successfully after installation. (link:https://issues.redhat.com/browse/OCPBUGS-74911[OCPBUGS-74911])
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      Before this update, the agent-based installer set the `root=/dev/disk/by-label/dm-mpath-root` kernel argument when installing to a multipath Fibre Channel volume. However, the filesystem labels were truncated to 12 characters in the `xfs` parameter. As a consequence, after an installation to an encrypted multipath Fibre Channel volume, the hosts did not boot successfully because the root volume could not be found. With this release, the kernel argument is removed because it is unnecessary. As a result, the hosts boot successfully after installation. (link: https://issues.redhat.com/browse/OCPBUGS-74911 [ OCPBUGS-74911 ])
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      Description of problem:

          3 node OCP cluster is to be deployed on baremetal servers with FC SAN storage attached with multipath (no local disks). Installation method is ABI. diskEncryption is enabled in the agent configuration. 
    Installation fails with warning "/dev/disk/by-label/dm-mpath-root does not exist and encryption is not applied.
    Also the rdsosreport.txt contains following error entries:
systemd[1]: Dependency failed for File System Check on /dev/disk/by-label/dm-mpath-root.
systemd[1]: Dependency failed for /sysroot.
systemd[1]: Dependency failed for Workaround dracut FIPS unmounting /boot.
    Weirdly, without enabling disk encryption, the installation goes fine.

    This issue has been discussed in the Slack and it seems a couple of patches may need to be ported back to this OCP release.
    Slack: https://redhat-internal.slack.com/archives/C02SPBZ4GPR/p1769702167035469
    Jira: https://issues.redhat.com/browse/MGMT-20302?focusedId=28944824&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-28944824

      Version-Release number of selected component (if applicable):

          4.18.30

      How reproducible:

          Always

      Steps to Reproduce:

          1.
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      Actual results:

      Expected results:

      Additional info:

          All configuration files (agent-install, install-config, etc) are available in the linked ticket (#04359875).

              zabitter Zane Bitter
              ibodunov Ivan Bodunov
              Vladislav Kolodny Vladislav Kolodny
              Lluis Cavalle Lluis Cavalle
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