[Bug 1441930] Re: Fix handling of multipathed disks with 4k-sectors

[Chris J Arges]

Hello Mauricio, or anyone else affected,

Accepted multipath-tools into trusty-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/multipath-
tools/0.4.9-3ubuntu7.3 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: multipath-tools (Ubuntu Trusty)
       Status: Triaged => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1441930

Title:
  Fix handling of multipathed disks with 4k-sectors

Status in multipath-tools package in Ubuntu:
  Fix Released
Status in parted package in Ubuntu:
  Fix Released
Status in multipath-tools source package in Trusty:
  Fix Committed
Status in parted source package in Trusty:
  Triaged

Bug description:
  The packages for libparted and kpartx don't have the patches for using
  multipath (actually device-mapper) on 4k-sector disks (generally: 'non
  512-byte sector disks')

  This causes the number of sectors of each device-mapper partition to be 1/8th (512/4096) of that expected.
  These 3 errors were identified:
  1) Partition sizes on multipath are 1/8th of the intended size
  2) The filesystem on the underlying device is not-accessible (only in the dm mapped device)
  3) grub-install fails w/ 'Unknown filesystem'

  The 2 patches attached contains upstream patches from parted and
  multipath-tools, and fix the issues (the installation finishes without
  errors and the system boots).

  
  QEMU/KVM
  --------

  If you don't have 4k-sector disks handy :)

  An example for multipath on 4k-sector disks, with 2 underlying
  devices:

          $ qemu-img create -f raw disk.img 16g

  	$ qemu-system-ppc64 -enable-kvm \
  	  -nographic -nodefaults \
  	  -monitor stdio -serial pty \
  	  -M pseries -m 2G \
  	  -net nic -net user \
  	  -drive media=cdrom,file=../../iso/vivid-server-ppc64el.iso.0408 \
  	  \
  	  -drive file=disk.img,if=none,cache=none,serial=my-serial,id=drive0 \
  	  -drive file=disk.img,if=none,cache=none,serial=my-serial,id=drive1 \
  	  -device scsi-hd,physical_block_size=4096,logical_block_size=4096,drive=drive0 \
  	  -device scsi-hd,physical_block_size=4096,logical_block_size=4096,drive=drive1

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