Public bug reported:
This issue should be covered in the release notes, but appears not to
be.
I was upgrading an Xubuntu based server from 7.10 to 8.04. This system
ran a 2.6.22-14-server kernel image and had an ATA-133 IDE system disk
(/dev/hda) and two SATA 320GB disks as a RAID-1 array (/dev/sda1 and
/dev/sdb1 configured as /dev/md0). The array was defined by an entry in
mdadm.conf:
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1
Following the upgrade to the 2.6.24-16-server kernel image, the device names
for the disks changed:
/dev/hda -> /dev/sda
/dev/sda -> /dev/sdb
/dev/sdb -> /dev/sdc
This was not expected and appeared as a failure to assemble the RAID
array. An attempt to manual start the RAID array brought it up with a
single disk only (/dev/sdb1). Only by poking around with fdisk was it
apparent that /dev/sda had a different partition scheme to that expected
- and was really /dev/hda1.
This problem was corrected by adding /dev/sdc1 back into the RAID array
and by updating mdadm.conf. However, the change to device names should
have been flagged up in the release notes and a warning given during the
upgrade process. This is probably only one example of how an unexpected
change to device names can screw up an upgrade.
** Affects: ubuntu
Importance: Undecided
Status: New
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Upgrade to 8.04 (Hardy) trashed RAID Array
https://bugs.launchpad.net/bugs/224171
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