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What is the procedure to replace a failing hard drive in a RAID array?

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http://serverfault.com – 3 years ago a co-worker setup a software RAID-6 array on Ubuntu 9.04 and I'm getting messages from the OS that the drive has bad sectors and should be replaced. I'd like to remove this drive and replace it with a new drive, however, I have never done this before and I'm terrified that in the process of fixing the array I'm going to end up ruining it. I know the device ID of the array and I know the device IDs of the individual drives in the array. Additionally I physically have the bad drive. What are the steps to replace the bad drive with a new drive and get the array running again? (HowTos)

grtyyu's picture
Submitted by grtyyu on 09/14/2012

Stories similar to What is the procedure to replace a failing hard drive in a RAID array?

I have a Dell T300 with a Perc 6i, to which 3 500Gb drives are connected. The are assembled into a raid 5 ~1000Gb VD.

My understanding of RAID 0 is that the data is split and striped across all of the drives in the array.

I am trying to install 12.04.2 LTS to a blank 40G IDE hard-drive that was previously used in a raid array under windows XP. I used GParted to delete the existing partition on the drive leaving the disk blank. The desktop CD could not even see this drive. I then tried partitioning/formatting the disk with an ext4 primary partition. The installer still could not see the drive.

We had a storage server with performance starting to be poor. When I installed Linux's smartutils, it found

Device: /dev/sdm, 2 Offline uncorrectable sectors

Since this was a rather large raid6 array ( 23 x 3TB setup ), I set the drive to faulty, and removed it from the array. I shutdown the server, replaced the drive, and powered it back up.

I have 6 1tb drives in a RAID5. 1 drive went down. On the RAID was 2 virtual machines that I really need back up and running. The spare drive I have to put in the server is a 1.5tb drive, which exceeds the physical per drive limit of the 2020SA. The drive is found in the disk utility, but it is not found in the array management section. I cannot add the drive to the array to have it rebuild.

I just finished setting up a RAID5 array with 3 new 1.5TB hard drives using mdadm. I spent the last 5 days trying to get the RAID array working. Everything is up and running now except I have not been able to share folders on this drive using Samba. I can share files in my home directory and on my NTFS drive, but not the RAID array. I am trying to access the shares from a Windows Vista PC.

I have a RAID 5 array with 3 Disks:

/dev/sdb /dev/sdc /dev/sdd

Over last weekend i was prompted that SDD had failed. so replaced the drive, added it back into the array and let it rebuild (1.5TB)

It stopped at about 64% with an error, found out that /dev/sdb is failing as well.

I imaged SDD onto a new drive (ddrescue) and SDB onto a new drive (ddrescue).

[ubuntu] Drobo-like RAID setup 31 weeks 4 days ago

I'm new to RAID and trying to get my head around things. I have owned a Drobo in the past (which I liked) but it failed.

Here's a hypothetical scenario:

Assume I set up a RAID-5 array consisting of four 1TB hot-swappable 2.5" SATA drives. I name this volume 'My Data'.

Expanding RAID-5 31 weeks 4 days ago

I'm new to RAID and trying to get my head around things. I have owned a Drobo in the past (which I liked) but it failed.

Here's a hypothetical scenario:

Assume I set up a RAID-5 array consisting of four 1TB hot-swappable 2.5" SATA drives. I name this volume 'My Data'.