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[ubuntu] One disk keeps going out of a RAID 1 array

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http://ubuntuforums.org – Hi guys, it's been quite a nightmare this weekend... I perform an upgrade from 11.04 to 12.04... the first reboot for 11.04 to 11.10 was OK, but the second, the serve won't start... because /dev/sdb partitions was removed from the raid... It's the second time it happen.. my host company say it's nothing, and I rebuilt the array... this time I spend a few hours between 3 & 7 am to restart my server correctly. there's still a f*cking bug that prevent you to type 'Y' to the question : would you like to boot a degraded array, I finally change the kernel option to allow booting d (Hardware)

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Submitted by xskl on 08/13/2012 – Made popular on 08/13/2012

Stories similar to [ubuntu] One disk keeps going out of a RAID 1 array

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.

Hello all,

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 am doing raid 1 on the same disk (not very good but better that doing no raid)  So, I followed the instructions but doing them on the same disk (except install MBR on only one disk) and I obtained the message at the boot :Multiple active partitionsAfterwards, I removed the boot flag on the second partitions making the raid 1 array, the new message isBooting...Missing OS  Is it really p

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.

So this is the first time I'm using RAID and I started with a 2x2TB RAID-5 array since I only had two disks at the time.

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.

I have just flashed my BIOS and now my machine does not detect my raid5 array! It has three 2TB drives in it so that is a LOT of data that will be lost!

I have NOT deleted the array and it does not offer me to reboot

I'm using Nvidia MediaShield! and Windows 7. Any ideas guys? Thanks!

Update: here is the GUI raid configuration.

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I've been using linux off and on for a few years. I now am using it for a network file server. My question is this, How do I automount a raid array.

I used mdadm to create it, but every time I restart the server it doesn't automount the raid array.

Degrading RAID 1 array 48 weeks 1 day ago

I originally setup a CentOS 6.2 server on two 500GB disks as a RAID 1 array from the install. One of the disks has been removed and I am now running the system on the remaining disk as a degraded a... [by RikT]