Latest revision as of 15:12, 12 December 2024

Install Using GPT on all architectures by Default

This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes process, proposals are publicly announced in order to receive community feedback. This proposal will only be implemented if approved by the Fedora Engineering Steering Committee.

Summary

This is a follow-up for the Fedora 37 change which made GPT the default partition table for x86_64. This change proposes switching to GPT for the other supported architectures as well.

Owner

Name: Vojtech Trefny
Email: vtrefny AT redhat.com

Current status

Targeted release: Fedora Linux 42
Last updated: 2024-12-12
Announced
Discussion thread
FESCo issue: <will be assigned by the Wrangler>
Tracker bug: <will be assigned by the Wrangler>
Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

In Fedora 37 we switched to GPT as the default partition table (disklabel) for x86_64, for Fedora 42 we propose to make the switch for other architectures as well. Because GPT was already the default for ARM64 this means switching to GPT for ppc64le and s390x architectures when installing on an empty disk or when the disk is being completely reset during the installation.

Note: for s390x this applies only to disks where MSDOS disklabel is currently being used as the default disklabel, for DASD we'll continue to use the DASD disklabel.

Feedback

Benefit to Fedora

Similarly to the previous change: simplifying the code path and making the same default across all architectures with as few exceptions as possible. Fedora CoreOS now also uses GPT as default on all architectures so this change will also unify our defaults.

Scope

Proposal owners: Change Blivet to prefer GPT as the default partition table on all architectures. Proposed upstream pull request: https://github.com/storaged-project/blivet/pull/1322

Other developers: No work from other developers will be needed.

Release engineering: #12491

Policies and guidelines: N/A (not needed for this Change)

Trademark approval: N/A (not needed for this Change)

Alignment with the Fedora Strategy:

Upgrade/compatibility impact

This change will affect only new installations, no change to the partition table will be done during the upgrade.

Early Testing (Optional)

Do you require 'QA Blueprint' support? N

Early testing can be done by using the boot option inst.disklabel=gpt. This option tells the installer to use GPT disklabel so it can be used to make sure the system is compatible and will install and boot correctly with GPT.

How To Test

Any of the installer test cases (for example QA:Testcase_Anaconda_autopart_(use_all_space)_install) can be used to test this. Note that the installer will create a new partition table only when an empty disk is used or when all preexisting devices are selected to be removed, the partition table cannot be changed when existing partitions are being reused.

The expected result is that GPT will be used as the partition table type on s390x and ppc64le. sudo fdisk -l /dev/sdx can be used to verify that GPT was used by the installer.

User Experience

Users shouldn't notice any significant change other than the switch from MSDOS to GPT disklabel. Other than that the user experience during installation, booting or using the system shouldn't change at all.

Dependencies

There are no dependencies for this change, all work will be done in Blivet, the library that Anaconda uses for storage configuration.

Contingency Plan

Contingency mechanism: Revert the change in upstream
Contingency deadline: Final Freeze
Blocks release? Yes

Documentation

The change will be documented in Anaconda release notes for Fedora 42 similarly to the documentation for the original Fedora 37 change.

Release Notes

@@ Line 7: / Line 7: @@
 == Summary ==
-This is a follow-up for the [[Changes/GPTforBIOSbyDefault|Fedora 37]] change which made GPT the default partition table for x86_64. This change proposes switching to GPT for the other supported architectures.
+This is a follow-up for the [[Changes/GPTforBIOSbyDefault|Fedora 37]] change which made GPT the default partition table for x86_64. This change proposes switching to GPT for the other supported architectures as well.
 == Owner ==
-<!--
-For change proposals to qualify as self-contained, owners of all affected packages need to be included here. Alternatively, a SIG can be listed as an owner if it owns all affected packages.
-This should link to your home wiki page so we know who you are.
--->
 * Name: [[User:vtrefny| Vojtech Trefny]]
-<!-- Include you email address that you can be reached should people want to contact you about helping with your change, status is requested, or technical issues need to be resolved. If the change proposal is owned by a SIG, please also add a primary contact person. -->
 * Email: vtrefny AT redhat.com
 <!--- UNCOMMENT only for Changes with assigned Shepherd (by FESCo)
 * FESCo shepherd: [[User:FASAccountName| Shehperd name]] <email address>
 -->
 == Current status ==
-[[Category:ChangePageIncomplete]]
+[[Category:ChangeAnnounced]]
 <!-- When your change proposal page is completed and ready for review and announcement -->
 <!-- remove Category:ChangePageIncomplete and change it to Category:ChangeReadyForWrangler -->
@@ Line 40: / Line 34: @@
 ON_QA -> change is fully code complete
 -->
-* [Announced]
+* [https://lists.fedoraproject.org/archives/list/devel-announce@lists.fedoraproject.org/thread/T3BGPFIMRMKWSXS4ZJMJCXXJIOLM3Y4V/ Announced]
-* [<will be assigned by the Wrangler> Discussion thread]
+* [https://discussion.fedoraproject.org/t/f42-change-proposal-install-using-gpt-on-all-architectures-by-default-system-wide/139538 Discussion thread]
 * FESCo issue: <will be assigned by the Wrangler>
 * Tracker bug: <will be assigned by the Wrangler>
@@ Line 47: / Line 41: @@
 == Detailed Description ==
-<!-- Expand on the summary, if appropriate.  A couple sentences suffices to explain the goal, but the more details you can provide the better. -->
+In Fedora 37 we switched to GPT as the default partition table (disklabel) for x86_64, for Fedora 42 we propose to make the switch for other architectures as well. Because GPT was already the default for ARM64 this means switching to GPT for ppc64le and s390x architectures when installing on an empty disk or when the disk is being completely reset during the installation.
+Note: for s390x this applies only to disks where MSDOS disklabel is currently being used as the default disklabel, for DASD we'll continue to use the DASD disklabel.
 == Feedback ==
@@ Line 53: / Line 50: @@
 == Benefit to Fedora ==
-<!-- What is the benefit to the distribution?  Will the software we generate be improved? How will the process of creating Fedora releases be improved?
-      Be sure to include the following areas if relevant:
-      If this is a major capability update, what has changed?
-           For example: This change introduces Python 5 that runs without the Global Interpreter Lock and is fully multithreaded.
-      If this is a new functionality, what capabilities does it bring?
-           For example: This change allows package upgrades to be performed automatically and rolled-back at will.
-      Does this improve some specific package or set of packages?
-           For example: This change modifies a package to use a different language stack that reduces install size by removing dependencies.
-      Does this improve specific Spins or Editions?
-           For example: This change modifies the default install of Fedora Workstation to be more in line with the base install of Fedora Server.
-      Does this make the distribution more efficient?
-           For example: This change replaces thousands of individual %post scriptlets in packages with one script that runs at the end.
-      Is this an improvement to maintainer processes?
-           For example: Gating Fedora packages on automatic QA tests will make rawhide more stable and allow changes to be implemented more smoothly.
-      Is this an improvement targeted as specific contributors?
-           For example: Ensuring that a minimal set of tools required for contribution to Fedora are installed by default eases the onboarding of new contributors.
-     When a Change has multiple benefits, it's better to list them all.
+Similarly to the previous change: simplifying the code path and making the same default across all architectures with as few exceptions as possible. Fedora CoreOS now also uses GPT as default on all architectures so this change will also unify our defaults.
-     Consider these Change pages from previous editions as inspiration:
-     https://fedoraproject.org/wiki/Changes/Annobin (low-level and technical, invisible to users)
-     https://fedoraproject.org/wiki/Changes/ParallelInstallableDebuginfo (low-level, but visible to advanced users)
-     https://fedoraproject.org/wiki/Changes/VirtualBox_Guest_Integration (primarily a UX change)
-     https://fedoraproject.org/wiki/Changes/NoMoreAlpha (an improvement to distro processes)
-     https://fedoraproject.org/wiki/Changes/perl5.26 (major upgrade to a popular software stack, visible to users of that stack)
--->
 == Scope ==
-* Proposal owners: Change [[Blivet]] to prefer GPT as default partition table on all architectures. Proposed upstream pull request: https://github.com/storaged-project/blivet/pull/1322
+* Proposal owners: Change [[Blivet]] to prefer GPT as the default partition table on all architectures. Proposed upstream pull request: https://github.com/storaged-project/blivet/pull/1322
 * Other developers: No work from other developers will be needed.
-* Release engineering: [https://pagure.io/releng/issues #Releng issue number] <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Release engineering: [https://pagure.io/releng/issue/12491 #12491] <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
 <!-- Does this feature require coordination with release engineering (e.g. changes to installer image generation or update package delivery)?  Is a mass rebuild required?  include a link to the releng issue.
 The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
@@ Line 99: / Line 71: @@
 == Upgrade/compatibility impact ==
-This change will affect only new installation, no change to the partition table will be done during upgrade.
+This change will affect only new installations, no change to the partition table will be done during the upgrade.
 == Early Testing (Optional) ==
@@ Line 105: / Line 77: @@
 Do you require 'QA Blueprint' support? N
-Early testing can be done by using the boot option `inst.disklabel=gpt`.
+Early testing can be done by using the boot option `inst.disklabel=gpt`. This option tells the installer to use GPT disklabel so it can be used to make sure the system is compatible and will install and boot correctly with GPT.
 == How To Test ==
-Any of the installer test cases (for example [[QA:Testcase_Anaconda_autopart_(use_all_space)_install]]) can be used to test this. The expected result is that GPT will be used as partition table type on s390x and ppc64le. `sudo fdisk -l /dev/sdx` can be used to verify.
+Any of the installer test cases (for example [[QA:Testcase_Anaconda_autopart_(use_all_space)_install]]) can be used to test this. Note that the installer will create a new partition table only when an empty disk is used or when all preexisting devices are selected to be removed, the partition table cannot  be changed when existing partitions are being reused.
+The expected result is that GPT will be used as the partition table type on s390x and ppc64le. `sudo fdisk -l /dev/sdx` can be used to verify that GPT was used by the installer.
 == User Experience ==
@@ Line 118: / Line 92: @@
 There are no dependencies for this change, all work will be done in [[Blivet]], the library that Anaconda uses for storage configuration.
 == Contingency Plan ==
@@ Line 125: / Line 98: @@
 * Contingency deadline: Final Freeze
 * Blocks release? Yes
 == Documentation ==
-<!-- Is there upstream documentation on this change, or notes you have written yourself?  Link to that material here so other interested developers can get involved. -->
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+The change will be documented in [https://github.com/rhinstaller/anaconda/blob/master/docs/release-notes.rst Anaconda release notes] for Fedora 42 similarly to the [https://github.com/rhinstaller/anaconda/blob/master/docs/release-notes.rst#gpt-is-the-default-disk-label-type documentation for the original Fedora 37 change].
-N/A (not a System Wide Change)
 == Release Notes ==

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