[Bug 599515] Re: mdadm misdetects disks instead of partitions

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: debian-installer (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/599515

Title:
  mdadm misdetects disks instead of partitions

Status in “debian-installer” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mdadm

  When building a RAID5 with mdadm mdadm confuses partitions and disks
  if the partition ends with the disk.

  Steps to reproduce: (in my case
  1. Take 4 500G harddisks.
  2. Add a 2 gigabyte partition to each of them
  3. Use the rest as a logical partition for the raid
  4. create a raid5 raid with /dev/sd?5

  mdadm --misc --examine /dev/sd? will show precisely the same as 
  mdadm --misc --examine /dev/sd?5
  On reboot the raid will use /dev/sd? instead of /dev/sd?5 either sd? will be inaccessable because another partition has been mounted before, resulting in a degrades raid, or after starting the raid other partitions will not be accessable.

  Possible solution:
  Fix mdadm so it first looks for superblocks on the partitions. If it found a superblock there, skip checking for the superblock of the device.

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