CentOS 5, original kernel (xen and normal) and everything, Linux RAID 1.
I rebooted one of my machines after doing some changes to RAID/LVM and now the two RAID partitions that I made changes to are "gone". I cannot boot into the system. On bootup it tells me that the devices md2 and md3 are busy or mounted and drops me to the repair shell. When I run fs check manually it just tells me the same. mdadm --misc --detail tells me that md2 and md3 are active and fine. I wanted to comment out the md2 and md3 devices in fstab (and hoped then be able to boot) but I get a "read-only" warning when writing to it although mount tells me that / is mounted rw.
What can I do to boot into the system (the system is on /dev/md1 and seems to be fine) or repair it?
The history of the changes is as follows. Originally I had several software-RAID 1 partitions /boot / /home /home2 on /dev/md0 etc. At the time of creation I didn't know I could use LVM on RAID partitions. Yesterday I activated LVM on md2 and md3 as they didn't contain anything valuable and put some data on them. What I did is unmount, then remove from RAID, then initialized LVM, then created the RAID devices again, then created the Volume Groups and Volumes, added mount points etc. All succeeded without errors and was working well thereafter. I worked several hours with data and xen virtual machines on the LVM partitions. The LVM management was done with the LVM manager in Gnome (as I'm not very familiar with LVM), the other stuff was done in a terminal. I assume something is wrong with the LVM setup or LVM doesn't start at all. What/how can I check?
Thanks.
Kai