I have an mdadm/lvm2 volume with 4 HDs that I created in Ubuntu 10.04. I just upgraded the computer to Ubuntu 10.10.
I redid the mdadm commands to get volume up and running, did mdadm --detail --scan > /etc/mdadm/mdadm.conf to get the configuration file.
But now, every time I reboot, it tells me that the volume is not ready. /proc/mdstat says that I always have one disk of the volume "inactive" as md_d127. I need to stop this volume and reassemble the whole thing to get it working.
This is what I get out of mdadm --detail --scan and put inside /etc/mdadm/mdadm.conf:
ARRAY /dev/md127 level=raid5 num-devices=4 metadata=01.02 name=:r0 UUID=7610a895:a54fe65b:c9876d2a:67f4a179
And this is my /proc/mdstat on boot:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : inactive sdb1(S) sdd1(S) sda1(S) 2930279595 blocks super 1.2 md_d127 : inactive sdc1(S) 976759865 blocks super 1.2 unused devices: <none>
I need to do mdadm -S /dev/md_d127, mdadm -S /dev/md127, mdadm -A --scan to get this volume working again.
What's going on? This did not happen with Ubuntu 10.04. I'm really fearing the loss of my raid5 data now.