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  1. RHEL
  2. RHEL-52200

Use GPT by default on ppc64le/s390x

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    • rhel-10.0
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      .GPT is now the default partition table for IBM Power Systems, Little Endian and 64-bit IBM Z architectures

      The GPT partition table is now selected by default instead of MSDOS when installing RHEL 10 for all newly partitioned disks during the installation.

      IMPORTANT: The GPT partition table is not selected by default for direct access storage device (DASD) drives on 64-bit IBM Z architecture, where the DASD partition table remains unchanged.

      This update simplifies and standardizes the default partitioning behavior across different architectures and platforms.

      NOTE: AMD and Intel 64-bit architectures and other products, such as RHEL Image Mode, already use the GPT partition table by default.
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      .GPT is now the default partition table for IBM Power Systems, Little Endian and 64-bit IBM Z architectures The GPT partition table is now selected by default instead of MSDOS when installing RHEL 10 for all newly partitioned disks during the installation. IMPORTANT: The GPT partition table is not selected by default for direct access storage device (DASD) drives on 64-bit IBM Z architecture, where the DASD partition table remains unchanged. This update simplifies and standardizes the default partitioning behavior across different architectures and platforms. NOTE: AMD and Intel 64-bit architectures and other products, such as RHEL Image Mode, already use the GPT partition table by default.
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      Anaconda as far as I can tell ties together the concept of an abstract "bios" booted system with the need to use MBR partitioning. I suspect it does this due to inheritance from x86.

      But at least ppc64le and s390x support booting fine with GPT partition tables...ok well there's a lot of ways to boot ppc64le and I am not 100% sure all support GPT but I'd be pretty suprised if they didn't.

      s390x with zipl reportedly works fine with GPT by default.

      We have been shipping GPT consistently across all 4 architectures with Fedora CoreOS derivatives since its creation, and I would like to continue this with Fedora bootc derivatives including RHEL Image Mode.

      Let's change Anaconda to default to GPT at least by RHEL10.

      xref:

              vtrefny@redhat.com Vojtěch Trefný
              walters@redhat.com Colin Walters
              Valentina Ashirova
              Vojtěch Trefný Vojtěch Trefný
              Release Test Team Release Test Team
              Angana Chakraborty Angana Chakraborty
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