Scott Silva wrote: > on 10/7/2007 10:40 PM Theo Band spake the following: >> Scott Silva wrote: >>> on 10/7/2007 2:41 PM Theo Band spake the following: >>>> # mdadm -Q /dev/sda >>>> /dev/sda: is not an md array >>>> /dev/sda: No md super block found, not an md component. >>>> # mdadm -Q /dev/sda1 >>>> /dev/sda1: is not an md array >>>> /dev/sda1: No md super block found, not an md component. >>>> # mdadm -Q /dev/sda2 >>>> /dev/sda2: is not an md array >>>> >>>> So it looks like all info is lost. Can I create a new array with the >>>> existing LVM partitions and the free partitions without destroying >>>> any data? >>>> >>> Your raid appears to be on /dev/sda3 /dev/sdb2 /dev/sdc2 /dev/sdd2 >>> Try mdadm --examine --brief --scan --config=partitions >>> and see if it sees anything. >>> >> # mdadm --examine --brief --scan --config=partitions >> >> Nothing.... >> Indeed these are the partitions that are now unused and used to be part >> of the raid. Any idea what could have gone wrong when I migrated to from >> FC3 to Centos? >> I also changed the mobo of this machine and changed the CPU from single >> to a dual core one. I assume support is in the kernel, so no special >> actions should be needed to get this to work during boot up. >> >> Theo > When you upgraded you might have formatted the partitions accidentally. > If there is no raid data there, you can try something like testdisk to > see if you can recover it, but chances are that your data is gone. > No I did not format the disk. All data was present, but by LVM. Every disk has two partitions, one unused and one added to a volume group. Just after I send the previous mail, I moved the two physical disks out of the volume group (pvmove). The first disk went OK, just in the middle of the move of the second disk I got a kernel panic. I was not able to boot anymore. Even a rescue Centos4.4 CD did not work. As soon as it started to look for existing installation it gave the same kernel panic. And this was on a live system, with everyone looking over my shoulder :-( Nice moment to try whether the backup server would work. (And it did, of course :-) I could solve the kernel panic by booting a FC7 live CD later on. It just found the Volume group still with four physical disk partitions in it. No extends were present on the two disk that I wanted to pull out of the group. Using the lvm tools on the FC7 CD I was able to finish the job. I installed FC7 using RAID1 on the two removed disks. After that I booted in FC7 and copied my centos installation from the two old volume group to the new raid1. After some fiddling with mkinitrd, I got is to boot Centos4.5 from the RAID1 created by FC7. So I expect a problem to exist with LVM and the kernel I'm using (2.6.9-55.0.6.ELsmp)