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

[Mauricio Faria de Oliveira]

BTW, but not too important:

There's a quite repetitive verbose output during update-grub, mentioning:
  ERROR: unsupported sector size 4096 on <partition>.

It happens because os-prober calls dmraid for every partition, but it doesn't support 4k sectors, and yields to stderr.
A simple redirect quiets it up.
... I'm not sure it should be quieted up :) feel free to modify the scripts if you think so, or tell me and I can submit another patch.

	~ # dmraid -r -c                                                               
	ERROR: unsupported sector size 4096 on /dev/sda.
	ERROR: unsupported sector size 4096 on /dev/sdb.
	ERROR: unsupported sector size 4096 on /dev/sdc.
	ERROR: unsupported sector size 4096 on /dev/sdd.
	ERROR: unsupported sector size 4096 on /dev/sde.
	ERROR: unsupported sector size 4096 on /dev/sdf.
	ERROR: unsupported sector size 4096 on /dev/sdg.
	ERROR: unsupported sector size 4096 on /dev/sdh.
	ERROR: unsupported sector size 4096 on /dev/sdi.
	ERROR: unsupported sector size 4096 on /dev/sdj.
	ERROR: unsupported sector size 4096 on /dev/sdk.
	ERROR: unsupported sector size 4096 on /dev/sdl.
	ERROR: unsupported sector size 4096 on /dev/dm-0.
	ERROR: unsupported sector size 4096 on /dev/dm-1.
	ERROR: unsupported sector size 4096 on /dev/dm-2.
	ERROR: unsupported sector size 4096 on /dev/dm-3.
	ERROR: unsupported sector size 4096 on /dev/dm-4.
	ERROR: unsupported sector size 4096 on /dev/dm-5.
	ERROR: unsupported sector size 4096 on /dev/dm-6.
	ERROR: unsupported sector size 4096 on /dev/dm-7.
	ERROR: unsupported sector size 4096 on /dev/dm-8.
	ERROR: unsupported sector size 4096 on /dev/dm-9.
	ERROR: unsupported sector size 4096 on /dev/dm-10.
	ERROR: unsupported sector size 4096 on /dev/dm-11.
	ERROR: unsupported sector size 4096 on /dev/dm-12.
	ERROR: unsupported sector size 4096 on /dev/dm-13.
	ERROR: unsupported sector size 4096 on /dev/dm-14.
	ERROR: unsupported sector size 4096 on /dev/dm-15.
	ERROR: unsupported sector size 4096 on /dev/dm-16.
	ERROR: unsupported sector size 4096 on /dev/dm-17.
	no block devices found
	~ # 

	~ # dmraid -r -c 2>/dev/null
	no block devices found

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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:
  New

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).

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