[Bug 959749] Re: disk-detect/multipath/enable=true fails at loading dm-multipath module

[Stefan Bader]

The dm-multipath was built-in in Lucid and became a module at some point. This needs to be added to the d-i section for the kernel build to make it available for the installer.
The device handlers never seem to have been built-in or contained in any d-i file. On the other hand it should not hurt to have them packaged as well (except space considerations on the media, but all four take about 100KB for amd64). And it is likely a bit late to experiment now.

So proposing to add dm-multipath to the md-modules udeb and the device
handlers to the scsi-modules udeb.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: New => In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Stefan Bader (stefan-bader-canonical)

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https://bugs.launchpad.net/bugs/959749

Title:
  disk-detect/multipath/enable=true fails at loading dm-multipath module

Status in “debian-installer” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  In Progress

Bug description:
  This appears to be a regression from Lucid. Attached is a screenshot of the fault, and a preseed to reproduce the
  issue. The most relevant parts of the preseed are:

  disk-detect	disk-detect/multipath/enable	boolean	true
  d-i     partman-auto/disk string /dev/mapper/mpath0
  ...
  d-i	pkgsel/include string byobu vim openssh-server multipath-tools multipath-tools-boot

  Which works well with Lucid. However, when I test the precise installer, I get a message
  saying dm-multipath.ko couldn't be loaded and it might be a parameter problem. This
  module doesn't take any parameters. After hitting continue life goes on until I get
  to the partman section which bails because there's no mpath0.

  I tested without setting auto/disk just to see and noted it was only presenting sd devices, it doesn't
  look like multipath was ever loaded.

  I wonder if the requisite modules are even on the installer anymore? The install
  is being performed over PXE.

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