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  1. OpenShift Bugs
  2. OCPBUGS-13185

Document disk ordering behavior in 4.13


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      Description of problem:

      We need to document a significant change in disk ordering / symbolic naming behavior in 4.13. I do not believe this impacts upgrades, but is important for fresh installs.
      With RHEL 9 kernels, the symbolic sdX disk naming can often change across reboots. This can cause RHCOS install issues where the 2nd boot can't find sysroot if a symbolic name like "/dev/sda" was used as the install device. The general recommendation for device parameters, including any specific disk reference, e.g. for LSO/ODF installs, is to use a persistent naming option such as /dev/disk/by-id or WWN. 
      This could require an adjustment to some existing automation since some sort of inspection may be needed to collect the install device by-id for each node. IPI and AssistedInstaller provide the rootDeviceHints option, for UPI it can be passed through the 'coreos.inst.install_dev' RHCOS install parameter. 

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


      How reproducible:

      often if non-persistent naming is used

      Steps to Reproduce:

      1. Fresh install 4.13 on baremetal system w/ multiple drives

      Actual results:

      Something like "sda" is no longer a reliable disk name

      Expected results:

      Documentation about this behavior change

      Additional info:


            rhn-support-jdohmann Jesse Dohmann
            jhopper@redhat.com Jenifer Abrams
            Gaoyun Pei Gaoyun Pei
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