Revision as of 19:44, 29 June 2020

Remove device-mapper-multipath from the Fedora workstation livecd

Summary

The Fedora workstation livecd is the default Fedora variant getfedora.org advices people to download. As such most Fedora workstation installs will be done from the livecd. This means that any package which is part of the livecd will be part of the default install for most users.

device-mapper-multipath is 1 of only 2 packages in the default install which still Requires the long obsoleted systemd-udev-settle.service, which waits for all device-detection to be done + some extra waiting just to be sure. This significantly slows down booting on various systems.

Multipath support is only necessary for installations in data-centers or other enterprise setups, as such having device-mapper-multipath on the livecd is not really necessary. For installations which do actually need this device-mapper-multipath the server installation iso can be used and this is a better fit for such installations.

Owner

Name: Hans de Goede
Email: hdegoede@redhat.com

Current status

Targeted release: Fedora 33
Last updated: 2020-06-29
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

device-mapper-multipath is 1 of only 2 packages in the default install which still Requires the long obsoleted systemd-udev-settle.service. The other package is dmraid see Disable dmraid.service on first run.

Multipath support is only necessary for installations in data-centers or other enterprise setups, as such having device-mapper-multipath on the livecd is not really necessary. For installations which do actually need this device-mapper-multipath the server installation iso can be used and this is a better fit for such installations.

Note then when installing from the server or everything netboot isos, device-mapper-multipath depending on the obsolete udev-settle service is not a problem, because then it will not be installed at all. Anaconda (the installer) adds storage related packages such as device-mapper-multipath to the installation package-set as necessary for the storage found at installation time. So any installs done through the netinst isos already will not have device-mapper-multipath installed.

Feedback

Benefit to Fedora

systemd-udev-settle.service causes a significant and sometimes quite long delay during boot. Removing / disabling the last 2 services depending on this long obsolete helper service will remove the unnecessary boot delay.

Scope

Proposal owners:
- Change the livecd packagelist (comps) to no longer include the device-mapper-multipath package

Other developers:
- No action is required by other developers
- Except if another package still brings in device-mapper-multipath through dependencies, then this needs to be solved / coordinated with that other packages maintainers

Release engineering: #9560 (a check of an impact with Release Engineering is needed)

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

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

Upgrade/compatibility impact

This only affects new installs, upgrades of installs which have device-mapper-multipath installed will still have it installed after the upgrade.

How To Test

Install F33 on a machine / VM
Do "rpm -q device-mapper-multipath", the output should be "device-mapper-multipath" is not installed

User Experience

Faster booting Fedora when installed from the livecd.

Dependencies

There are no other changes / package updates this Change depends on; or which this change impacts.

Contingency Plan

Contingency mechanism: Re-add device-mapper-multipath to the livecd if the dropping of it causes problems.
Blocks release? No

Documentation

This change does not require any documentation.

Release Notes

FIXME

@@ Line 14: / Line 14: @@
 == Current status ==
-<!-- remove Category:ChangePageIncomplete and change it to Category:ChangeReadyForWrangler -->
+[[Category:ChangeReadyForWrangler]]
-[[Category:ChangePageIncomplete]]
 [[Category:SystemWideChange]]
@@ Line 37: / Line 36: @@
 Multipath support is only necessary for installations in data-centers or other enterprise setups, as such having device-mapper-multipath on the livecd is not really necessary. For installations which do actually need this device-mapper-multipath the server installation iso can be used and this is a better fit for such installations.
-<!-- Expand on the summary, if appropriate.  A couple sentences suffices to explain the goal, but the more details you can provide the better. -->
+Note then when installing from the server or everything netboot isos, device-mapper-multipath depending on the obsolete udev-settle service is not a problem, because then it will not be installed at all. Anaconda (the installer) adds storage related packages such as device-mapper-multipath to the installation package-set as necessary for the storage found at installation time. So any installs done through the netinst isos already will not have device-mapper-multipath installed.
 == Feedback ==
 <!-- Summarize the feedback from the community and address why you chose not to accept proposed alternatives. This section is optional for all change proposals but is strongly suggested. Incorporating feedback here as it is raised gives FESCo a clearer view of your proposal and leaves a good record for the future. If you get no feedback, that is useful to note in this section as well. For innovative or possibly controversial ideas, consider collecting feedback before you file the change proposal. -->
 == Benefit to Fedora ==
+systemd-udev-settle.service causes a significant and sometimes quite long delay during boot. Removing / disabling the last 2 services depending on this long obsolete helper service will remove the unnecessary boot delay.
-<!-- 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.
-     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:
-<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
+** Change the livecd packagelist (comps) to no longer include the device-mapper-multipath package
-* Other developers: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Other developers:
-<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
+** No action is required by other developers
+** Except if another package still brings in device-mapper-multipath through dependencies, then this needs to be solved / coordinated with that other packages maintainers
-* Release engineering: [https://pagure.io/releng/issues #Releng issue number] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Release engineering: [https://pagure.io/releng/issue/9560 #9560] (a check of an impact with Release Engineering is needed)
-<!-- 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 -->
-* Policies and guidelines: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
+* Policies and guidelines: N/A (not needed for this Change)
-<!-- Do the packaging guidelines or other documents need to be updated for this feature?  If so, does it need to happen before or after the implementation is done?  If a FPC ticket exists, add a link here. -->
 * Trademark approval: N/A (not needed for this Change)
-<!-- If your Change may require trademark approval (for example, if it is a new Spin), file a ticket ( https://fedorahosted.org/council/ ) requesting trademark approval from the Fedora Council. This approval will be done via the Council's consensus-based process. -->
 == Upgrade/compatibility impact ==
-<!-- What happens to systems that have had a previous versions of Fedora installed and are updated to the version containing this change? Will anything require manual configuration or data migration? Will any existing functionality be no longer supported? -->
+This only affects new installs, upgrades of installs which have device-mapper-multipath installed will still have it installed after the upgrade.
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == How To Test ==
-<!-- This does not need to be a full-fledged document. Describe the dimensions of tests that this change implementation is expected to pass when it is done.  If it needs to be tested with different hardware or software configurations, indicate them.  The more specific you can be, the better the community testing can be.
+# Install F33 on a machine / VM
+# Do "rpm -q device-mapper-multipath", the output should be "device-mapper-multipath" is not installed
-Remember that you are writing this how to for interested testers to use to check out your change implementation - documenting what you do for testing is OK, but it's much better to document what *I* can do to test your change.
-A good "how to test" should answer these four questions:
-. What special hardware / data / etc. is needed (if any)?
-. How do I prepare my system to test this change? What packages
-need to be installed, config files edited, etc.?
-. What specific actions do I perform to check that the change is
-working like it's supposed to?
-. What are the expected results of those actions?
--->
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == User Experience ==
-<!-- If this change proposal is noticeable by users, how will their experiences change as a result?
+Faster booting Fedora when installed from the livecd.
- This section partially overlaps with the Benefit to Fedora section above. This section should be primarily about the User Experience, written in a way that does not assume deep technical knowledge. More detailed technical description should be left for the Benefit to Fedora section.
- Describe what Users will see or notice, for example:
-  - Packages are compressed more efficiently, making downloads and upgrades faster by 10%.
-  - Kerberos tickets can be renewed automatically. Users will now have to authenticate less and become more productive. Credential management improvements mean a user can start their work day with a single sign on and not have to pause for reauthentication during their entire day.
- - Libreoffice is one of the most commonly installed applications on Fedora and it is now available by default to help users "hit the ground running".
- - Green has been scientifically proven to be the most relaxing color. The move to a default background color of green with green text will result in Fedora users being the most relaxed users of any operating system.
--->
 == Dependencies ==
-<!-- What other packages (RPMs) depend on this package?  Are there changes outside the developers' control on which completion of this change depends?  In other words, completion of another change owned by someone else and might cause you to not be able to finish on time or that you would need to coordinate?  Other upstream projects like the kernel (if this is not a kernel change)? -->
+There are no other changes / package updates this Change depends on; or which this change impacts.
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == Contingency Plan ==
+* Contingency mechanism: Re-add device-mapper-multipath to the livecd if the dropping of it causes problems.
-<!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "Revert the shipped configuration".  Or it might not (e.g. rebuilding a number of dependent packages).  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
+* Blocks release? No
-* Contingency mechanism: (What to do?  Who will do it?) N/A (not a System Wide Change)  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-<!-- When is the last time the contingency mechanism can be put in place?  This will typically be the beta freeze. -->
-* Contingency deadline: N/A (not a System Wide Change)  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-<!-- Does finishing this feature block the release, or can we ship with the feature in incomplete state? -->
-* Blocks release? N/A (not a System Wide Change), Yes/No <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-* Blocks product? product <!-- Applicable for Changes that blocks specific product release/Fedora.next -->
 == 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. -->
+This change does not require any documentation.
-<!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
-N/A (not a System Wide Change)
 == Release Notes ==
+FIXME
 <!-- The Fedora Release Notes inform end-users about what is new in the release.  Examples of past release notes are here: http://docs.fedoraproject.org/release-notes/ -->
 <!-- The release notes also help users know how to deal with platform changes such as ABIs/APIs, configuration or data file formats, or upgrade concerns.  If there are any such changes involved in this change, indicate them here.  A link to upstream documentation will often satisfy this need.  This information forms the basis of the release notes edited by the documentation team and shipped with the release.

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