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[ubuntu] A drive in a mdadm RAID1 array failed - ruined the array?

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http://ubuntuforums.org – I'm curious if anybody can piece together some degree of logic to my story. My server is running 12.04, and it has 3 drives installed. 160GB = OS 2x500GB (RAID1 Mirror via mdadm) = /media/NAS I noticed the files on my web server were gone one day, yet Apache was responding properly. I came home to find that Disk Utility reported one drive as healthy and the other as having "a few bad sectors." These drives are Seagates, and between the 2 I've already had 3 RMA's... this one marks the 4th. Anyway, I didn't know what to do, so I kicked out the problematic drive out of the array (Hardware)

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Submitted by xskl on 10/26/2012 – Made popular on 10/26/2012

Stories similar to [ubuntu] A drive in a mdadm RAID1 array failed - ruined the array?

Where is my array? 2 years 43 weeks ago

I have recently installed Debian 505 to replace 504 because one of its new features is "experimental support" for sata software raid1. I have also tried to set up raid 1 at the same time but I cannot find how to access the array.

I installed the OS on a PATA drive and used 2 new SATA drives for the raid1 array (intended for data).

I have two slightly different 1 TB hard drives and I want to create a RAID1. I have spent last 5 hours trying to archive the same effect on virtual machine, because I want to test it out before playing with 500GB of data (but I also have a backup of this).

/dev/sda is drive with system /dev/sdb is empty drive

I have done following:

dd if=/dev/sda of=/dev/sdb bs=32M

and then:

mdadm --create

I'm starting to get a collection of computers at home and to support them I have my "server" linux box running a raid array.

Its currently mdadm raid1, going to raid5 once I have more drives (and then raid6 I'm hoping for).

Quick info: Dell R410 with 2x500GB drives in RAID1 on H700 Adapter

Recently one of drives in RAID1 array on server failed, lets call it Drive 0. RAID controller marked it as fault and put it offline.

Question 1 - Before you answer with "it just takes the smaller disk", hear me out quick. My 3TB WD Reds come out to be 3001 GB in size. Let's say I set up a mirror via mdadm for sdb1 and sdc1 which span 100% of the drive. But suddenly, one of the drives fail. The replacement is a 3TB, weighing in at 3000 GB.

i had an mdadm raid6 array with 13x1TB drives. Within 10 minutes 3 of these drives fell out of the array... we assume bad cable to the controller card and replaced, however now we need to get the drives back into a working array.

because md0 was marked as failed we removed the mdadm array and made a new md0 with the original 13 drives. 1 failed again during rebuild so we now have a degraded md0.

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.

Hi All, I'm having a bit of a time with MDADM. Basically I have a RAID6 system setup w/ 10 hard drives (1.5GB). Last night I had a failed drive and i accidentally failed out the wrong drive trying to fix it. Right now I can get the array to assemble successfully but I cant read anything off of md0, it can't mount either.

I'm fairly new to Ubuntu but I was able to setup my server with RAID5. The OS resides on a separate drive and there are 3 drives in my array.

The problem is that I had to reinstall my OS on a new drive (currently /dev/sdd) due to a hardware failure and needed to recover my array.