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)
___
CentOS mailing list
CentOS@centos.org
http://lists.centos.org/mailman/listinfo/centos
