On a system installed from scratch with Centos6, the disks were setup with md raid1 as such:<br />
# cat /proc/mdstat<br />
Personalities : [raid1]<br />
md2 : active raid1 sda5[0] sdb5[1]<br />
387454784 blocks super 1.1 [2/2] [UU]<br />
bitmap: 2/3 pages [8KB], 65536KB chunk<br />
<br />
md1 : active raid1 sdb2[1] sda2[0]<br />
67075968 blocks super 1.1 [2/2] [UU]<br />
bitmap: 1/1 pages [4KB], 65536KB chunk<br />
<br />
md0 : active raid1 sdb1[1] sda1[0]<br />
102336 blocks super 1.0 [2/2] [UU]<br />
<br />
redhat-upgrade-tool prepares the system for upgrade to Centos7. <br />
When rebooting into the upgrade kernel, it cannot mount the paritions. From the error message it seems, the upgrade kernel can only handle version-0 superblocks. However Centos6 installer creates version-1 superblocks.<br />
There is no way to convert the superblocks. Upgrade fails.<br />
I could not save the actual logs, because USB also didnt work.
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