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= Feature Name <!-- The name of your feature --> =
= Multipath Installation =


== Summary ==
== Summary ==
<!-- A sentence or two summarizing what this feature is and what it will do.  This information is used for the overall feature summary page for each release. -->
Anaconda in previous Fedora releases lacked the ability to correctly identify and set up multipath devices for use as installation targets.  This feature represents the addition of that ability.


== Owner ==
== Owner ==
<!--This should link to your home wiki page so we know who you are-->
* Name: [[User:Pjones| Peter Jones]]
* Name: [[User:FASAcountName| Your Name]]
* Email: pjones@redhat.com
 
<!-- Include you email address that you can be reached should people want to contact you about helping with your feature, status is requested, or  technical issues need to be resolved-->
* Email: <your email address so we can contact you, invite you to meetings, etc.>


== Current status ==
== Current status ==
* Targeted release: [[Releases/{{FedoraVersion||next}} | {{FedoraVersion|long|next}} ]]  
* Targeted release: [[Releases/F13 | Fedora 13 ]]  
* Last updated: (DATE)
* Last updated: 26-Jan-2010
* Percentage of completion: XX%
* Percentage of completion: 90%
 
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== Detailed Description ==
== 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. -->
This feature adds support for installing to a multipath device and booting from such a device.


== Benefit to Fedora ==
== Benefit to Fedora ==
<!-- What is the benefit to the platform?  If this is a major capability update, what has changed? If this is a new feature, what capabilities does it bring? Why will Fedora become a better distribution or project because of this feature?-->
This is a hardware enabling feature. It allows Fedora to be installed on machines which were previously problematic.


== Scope ==
== Scope ==
<!-- What work do the 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?-->
This has repercussions in several packages:
* Anaconda
** identification/setup before install
** configure dracut to build a hostonly initrd
* grubby/kernel:
** build initrd at the end of the installation rather than as soon as the kernel is installed
* dracut
** assemble mpath devices during boot in order to correctly find the root filesystem


== How To Test ==
== How To Test ==
<!-- This does not need to be a full-fledged document.  Describe the dimensions of tests that this feature 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 to a machine with multipath storage.
 
** Ideally, test devices should include active/active and active/passive configurations.
Remember that you are writing this how to for interested testers to use to check out your feature - documenting what you do for testing is OK, but it's much better to document what *I* can do to test your feature.
* see if it boots correctly afterwards
 
** boot, and then run "dmsetup ls" and "dmsetup table" as root, making sure that the output indicates that / is indeed using a multipath device.
A good "how to test" should answer these four questions:
 
0. What special hardware / data / etc. is needed (if any)?
1. How do I prepare my system to test this feature? What packages
need to be installed, config files edited, etc.?
2. What specific actions do I perform to check that the feature is
working like it's supposed to?
3. What are the expected results of those actions?
-->


== User Experience ==
== User Experience ==
<!-- If this feature is noticeable by its target audience, how will their experiences change as a result?  Describe what they will see or notice. -->
During installation, multipath devices should show up on the "multipath" tab under "Specialized Storage Devices", and the constituent devices should not be present.


== Dependencies ==
== Dependencies ==
<!-- What other packages (RPMs) depend on this package?  Are there changes outside the developers' control on which completion of this feature depends?  In other words, completion of another feature 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 feature)? -->
This depends on changes to:
* anaconda (80% done (kickstart support is TODO))
* dracut (100% done)
* device-mapper-multipath (100% done)
* lvm (0% done (one line change))
* kernel (0% done)
* grubby (0% done)


== Contingency Plan ==
== Contingency Plan ==
<!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "None necessary, revert to previous release behaviour."  Or it might not.  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy. -->
* None necessary - hardware that doesn't install correctly still won't install correctly.


== Documentation ==
== Documentation ==
<!-- Is there upstream documentation on this feature, or notes you have written yourself? Link to that material here so other interested developers can get involved. -->
* No separate docs at this time; we will add some for kickstart support. There's also some documentation of the UI as part of [https://fedoraproject.org/wiki/Design/AnacondaStorageUI the storage design page].
*


== Release Notes ==
== Release Notes ==
<!-- 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/ -->
* anaconda now supports installation to multipath devices.
<!-- 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 feature, indicate them here.  You can also link to upstream documentation if it satisfies this need.  This information forms the basis of the release notes edited by the documentation team and shipped with the release. -->
*


== Comments and Discussion ==
== Comments and Discussion ==
* See [[Talk:Features/YourFeatureName]] <!-- This adds a link to the "discussion" tab associated with your page.  This provides the ability to have ongoing comments or conversation without bogging down the main feature page -->
* See [[Talk:Features/MultipathInstall]]
 


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Revision as of 15:53, 26 January 2010


Multipath Installation

Summary

Anaconda in previous Fedora releases lacked the ability to correctly identify and set up multipath devices for use as installation targets. This feature represents the addition of that ability.

Owner

Current status

  • Targeted release: Fedora 13
  • Last updated: 26-Jan-2010
  • Percentage of completion: 90%

Detailed Description

This feature adds support for installing to a multipath device and booting from such a device.

Benefit to Fedora

This is a hardware enabling feature. It allows Fedora to be installed on machines which were previously problematic.

Scope

This has repercussions in several packages:

  • Anaconda
    • identification/setup before install
    • configure dracut to build a hostonly initrd
  • grubby/kernel:
    • build initrd at the end of the installation rather than as soon as the kernel is installed
  • dracut
    • assemble mpath devices during boot in order to correctly find the root filesystem

How To Test

  • install to a machine with multipath storage.
    • Ideally, test devices should include active/active and active/passive configurations.
  • see if it boots correctly afterwards
    • boot, and then run "dmsetup ls" and "dmsetup table" as root, making sure that the output indicates that / is indeed using a multipath device.

User Experience

During installation, multipath devices should show up on the "multipath" tab under "Specialized Storage Devices", and the constituent devices should not be present.

Dependencies

This depends on changes to:

  • anaconda (80% done (kickstart support is TODO))
  • dracut (100% done)
  • device-mapper-multipath (100% done)
  • lvm (0% done (one line change))
  • kernel (0% done)
  • grubby (0% done)

Contingency Plan

  • None necessary - hardware that doesn't install correctly still won't install correctly.

Documentation

  • No separate docs at this time; we will add some for kickstart support. There's also some documentation of the UI as part of the storage design page.

Release Notes

  • anaconda now supports installation to multipath devices.

Comments and Discussion

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