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[ubuntu] Problem getting RAID 1 to work after clean 12.10 install

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http://ubuntuforums.org – Hey, I have been losing quite a bit of sleep after a botched upgrade to 12.04. I gave up the upgrade and chose a clean install of 12.10. That went fairly well (apart from my nvidia card problems) however I have not been able to get my RAID array to work. I have tried many things up until now but I have not been able to mount the array. The OS is on a single, seperate hdd with two disks in a RAID 1 set up in Ubuntu. my mdstat: Code: mo@Allah:~$ cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdb (Hardware)

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Submitted by linuxfan on 11/02/2012 – Made popular on 11/02/2012

Stories similar to [ubuntu] Problem getting RAID 1 to work after clean 12.10 install

I'm using Ubuntu Server 11.10 and the hard drives in my (md) raid-5 array are constantly working (I can hear them crunching) when I mount them. Soon after I unmount them, they stop.

Hi

No longer able to access my raid, not sure what caused this, but im not able to start it either, help!

mdadm -E /dev/md0 mdadm: no md superblock detected on /dev/md0

mdadm -D /dev/md0 mdadm: md device /dev/md0 does not appear to be active

cat /proc/mdstat shows Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]

md0: inactive sdb1[2](S) sdc1[1](S)

Broken raid 38 weeks 6 days ago

Hello, I have 2 servers with broken raid 1, but each one gives me a different error, I dont know what is the difference.

Code: [root@ ~]# cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdb1[2](F) sda1[0]       2102464 blocks [2/1] [U_]

md1 : active raid1 sdb2[2](F) sda2[0]       264960 blocks [2/1] [U_]

md

I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk.

~# mdadm --add /dev/md1 /dev/sdb ~# mdadm --grow /dev/md1 --raid-devices=5

midway through the grow I recieved this in an email;

A Fail event had been detected on md device /dev/md/fubox:1.

It could be related to component device /dev/sdf.

Faithfully yours, etc.

P.S.

My Raid 5 array (4 1tb Disks WD10EARS) had was showing as degraded. I looked and one of the disks wasnt installed, so i re-added it with the mdadm add command.

the array is now showing as (null)Array , but cant be mounted

if i run:

root@warren-P5K-E:/home/warren# sudo mdadm --misc --detail /dev/md0

I get:

mdadm: cannot open /dev/md0: No such file or directory

and running:

root@warren-P5K-

My Mdadm Raid5 array of 4 drives failed during synchronization after replacement of one failed drive. It threw me to RamFS where after a while I couldn't mount the array any more (don't know what I did...

I don't know why, but I have big trouble with speed of my raid.

I have 4x WD RE4 7200RPM 500GB. Size of RAID 5 is 1000GB.

Today I'm in a very bad place. A production raid array went down. The controller failed. After unmounting the file systems and killing all processes, I changed the hardware controller.

I'm having a problem with one of my hard drives as I have been receiving this email for the past few days.

Code: "A DegradedArray event had been detected on md device /dev/md127." I decided to Google further and looked into the contents of my mdstat file, this is the output:

Code: Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md1