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[ubuntu] 64 bit Server 11.10 and MDADM problem

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http://ubuntuforums.org – Hi all, I tried to upgrade my file server box running 11.04 64 bit server with 5 drives in a array to 11.10 server. Now, my RAID array is /dev/md0 and composed of 5 drives with no partitions. That is, I created the array, formatted /dev/md0 with EXT4 and that's it. Worked fine. Now MDADM for 11.10 complains that I have a "degraded array" and wants me to fix it or hit ctrl-D to continue (kinda difficult for a headless server box). It complains because it sees no "valid partition table". If I do ctrl-D out of it and mount the array manually, it works fine. But the (Hardware)

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Submitted by dayu on 02/05/2012 – Made popular on 02/05/2012

Stories similar to [ubuntu] 64 bit Server 11.10 and MDADM problem

A while back I created a RAID 6 array consisting of 5 2TB drives and formatted it with XFS and set up the block and stripe size appropriately.

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I've got a little file/web server box that runs Ubuntu 12.04 64 bit server with five 2TB Western Digital hard drives.

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I'm new to Ubuntu and server administration in general, but have been having good times with several Ubuntu 12.04 servers I've set up at my company.

I had believed I had properly set up a software RAID-1 array during Ubuntu installation on one server, but when I learned more about the mdadm tool, I discovered the RAID is degraded and one of the disks is "removed"

Code:

I have a raid 5 array constructed of three partitions, one of which is another array. This array should be assembled during boot so that it can be mounted and other services can access the mounted data.

After a restart which stalled, I did a hard reboot and now mdadm can't see the RAID 6 array anymore, LVM can't find the volume which was on that raid array.

After rebooting my server this afternoon I noticed that after booting the OS from grub, that the system complained that my raid5 array was degraded. It offered to boot to a command line, or also offered to start the "degraded" array and ended up booting normally after a quasi-verbose boot.

I'm in the OS now, and things _seem_ to be working normally.