Public bug reported:
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.
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
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mdadm misdetects disks instead of partitions
https://bugs.launchpad.net/bugs/599515
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