A linux utility used to manage software RAID devices.

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How do i prevent lilo from doing a disk scan?

I have gentoo installed using root on LVM on RAID5. I made a mistake when I set up lilo but the initrd created by genkernel caught it and allowed me to type in the correct root partition. I have ...
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10 views

Mdadm raid gone after reboot

Mdadm raid gone after reboot. Will gdisk work on 6TB HDD's? Will some describe how to use "parted" to write "fd00"? Rephrased better
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55 views

MDADM reshape really slow

To sum up : My raid reshape with mdadm is really slow. The complete story : 3 days ago I realized that one of my disks from a raid 5 array was faulty. I removed it and replaced it with a brand new ...
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18 views

Trying to mount Western digital mybook duo raid 2 disks but fails

I connect both my linux system. I do a bash-4.2# mdadm --assemble --scan mdadm: /dev/md/MyBookLiveDuo:2 has been started with 2 drives. then i try mount /dev/ ash-4.2# mount /dev/md/MyBookLiveDuo:2 ...
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30 views

Strange software RAID performance results (on linux)

I have four 2TB 7200rpm hard drives that I want to configure as a software RAID array, using mdadm on linux (Ubuntu 15.10). I took this opportunity to explore the read/write performance of various ...
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6 views

Growing an mdadm RAID array with differently sized disks

I have a raid6 archive array made up of 4 2TB drives (+OS on an independent SSD). I'm starting to run out of space and my target final goal is 4 4TB drives. I don't have enough SATA ports to run both ...
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34 views

MDADM rebuild raid 6 with 3 'failed' drives

I've ran into the following problem: My Raid 6 (/dev/md6) failed after 3 disks fell out of the array. One of the disks must have been out for a while (in SMART, 5 of the 6 disks have an uptime of ...
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7 views

Problems reassembling software RAID6

I have a software raid6 array (mdraid) consisting of 6 drives (/dev/sd[f-k] at the moment) at /dev/md1. Because I had to pull a different drive out of the machine (not one of the 6 drives), I ran ...
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25 views

Ubuntu RAID 10 - unable to assemble

Here's a brief history of how I got here: 4x disk Ubuntu 12.04 software RAID10 with 5x partitions (md0 - md4) 1x disk died mdadm --fail > mdadm --remove > physically removed drive and replace mdadm ...
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30 views

Does mdadm record array event history?

I received an automated email from the mdadm daemon: A Fail event had been detected on md device /dev/md0. It could be related to component device /dev/sdh. I find the wording strange. "could be"? ...
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34 views

Growing mdadm array; Cannot find backup file on FS where it's supposed to be

The situation: I am currently growing my RAID-6 array from 4x4TB to 5x4TB. To achieve that, I used to following command: root# mdadm --grow /dev/md0 --backup-file=/root/backup/raid/4d_to_5d ...
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21 views

What is theoretical max benefit from read speeds under RAID5?

I have a 5 drive RAID5 with mdadm. When I do hdparm -Tt on all the constituent drives I find the slowest is about 230MB/s. Is the maximum theoretical limit of read speeds going to be (5-1)*230 or ...
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85 views

mdadm not reassembling array on boot

I'm currently using arch on my Asus UX51VZ laptop for almost a month. I have a fakeraid setup with two 256GB SSDs using mdadm. I was using this configuration without any problems. However after I've ...
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26 views

RAID 5 showing two disks in same slot

We recently had a power failure for a few hours and when the power came back both my RAID arrays failed. The one I am trying to fix is a RAID5 with 5 disks (I also have a RAID1 with 2 disks, but I ...
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89 views

Random kernel panic after re-installing Arch Linux

I recently had two hard drives that crashed in a RAID 5 array, I didn't configure any monitoring, so I didn't notice that one had been crashed for a while. So I decided to scrap everything and start ...
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24 views

Moving from debian to unbuntu - mdadm raid vol going to be ok?

I'm a little nervous about this decision, but I've recently updated the hardware in my NAS/HTPC and Debian wheezy network drivers aren't happy and regularly need to reboot to get eth1 working again. ...
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60 views

Recover mdadm raid5 with XFS

I am trying to recover data from an old Buffalo Terastation that failed. A previous attempt to recover the data by someone else was unsuccesful and I have been left with the following situation. NB: ...
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56 views

Assemble 3 drive software RAID5 with one disk missing

Is it possible to assemple a three drive software RAID5 with only two disks? I have one failed disk in my setup which i could not read at all but the two other disks are fine. So i created a dump of ...
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36 views

partition device (i.e. /dev/sdd1) not created for hard drive

I am having a similar problem as posted here where a hard drive has an old mdadm signature on it and the partition on it is not given a device file in /dev Unfortunately the solution provided in this ...
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1answer
128 views

Fail device in md RAID when ATA stops responding

I had created five 1TB HDD partitions (/dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sde1, and /dev/sdf1) in a RAID 6 array called /dev/md0 using mdadm on Ubuntu 14.04 LTS Trusty Tahr. The command sudo mdadm ...
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187 views

Dual boot Win8/Linux on Asus Zenbook UX301 keeping intel imsm RAID0

I have Asus Zenbook UX301 with Win8 preinstalled. I would like to have a Linux installed in dual-boot configuration. However, Windows is using the notebook 2 SSDs as intel RAID0 (rom-based RAID, ...
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I can't access my LVM partition after RAID recovery

I need help after an accident with my RAID 5. I recreated it with: mdadm --verbose --create /dev/md2 --level=5 --chunk=64 --raid-devices=4 /dev/sdb4 /dev/sda4 /dev/sdd4 missing My array seems to ...
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20 views

re-assemble out-of-date raid5?

I need help with my raid5 after it crashed through bad sectors. Previously I could re-assemble it with # mdadm --assemble --force -v /dev/md0 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 but ...
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264 views

OwnCloud - storing data on RAID array

I have a server running Ubuntu Server 14.10 LTS 64bit. It has an O/S drive, and then a data RAID-1 array mounted under /srv/storage I've installed OwnCloud server using the default sqlite DB. I've ...
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33 views

Ubuntu Server 12.04. Software RAID1 state degraded with a spare drive

After a disk failure, this is the output of mdadm --detail /dev/md2 in my Ubuntu Server 12.04: /dev/md2: Version : 1.2 Creation Time : Thu Dec 27 10:51:42 2012 Raid Level : raid1 Array Size : ...
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21 views

Error RAID1 but can't seem to find where the error is?

I'm having trouble figuring out where the problem is. I'm seeing my two drives... I removed a failed drive and installed an empty one. Thought I added it to the raid and it said it was rebuilding. ...
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47 views

Linux soft RAID5 array with mismatched events won't assemble

The last three nights, one of my USB controllers has gone offline in the middle of the night, knocking 4 of my 8 disks offline. The first two times, I was able to get it working again with mdadm -A ...
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96 views

upgrade (software) RAID 1 capacity

I am upgrading a software RAID 1 array (/dev/md0) from 2TB drives (sda and sdb) to 4TB (sdc and sdd). Straight forward; ext3, single partition, no MBR, no LVM. In the end, I would like to have two ...
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199 views

how to trim the SSD disk of an hybrid Linux soft RAID?

We are considering implementing an Hybrid Linux Raid with SSD+HD by using the "writemostly" flag that supposedly makes the raid write further to the HD than to SSD while maintaining the benefits of ...
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145 views

mdadm --examine displays something different than --detail

Who should I trust to fill my /etc/mdadm/mdadm.conf ? mdadm --examine --scan returns /dev/md/0 while obviously it's /dev/md0 that is currently rebuilding What should I put in my /etc/mdadm/mdadm.conf ...
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161 views

Functional MD complex RAID10 suddenly marks all drives as spares

This morning during a long ~1.5TB read operation sending data to an NFS client, my md complex-RAID10 array spontaneously stopped, then dropped four members for being "non-fresh" and failed to start ...
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61 views

Growing an encrypted RAID5 array without causing alignment issues

Question Is there anyway to tell mdadm to make sure a certain logical sector on the RAID-device stays aligned to the beginning of a stripe when growing a RAID5 array? Problem My RAID5 is encrypted ...
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135 views

mdadm: Reactivating RAID6 array after improper shutdown

I have a seven-disk RAID6 array on a file server. The server experienced a crash and a hard reset was required, resulting in an improper shutdown. Note that I/O activity was likely occurring on the ...
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634 views

Removing a disk from an Ubuntu mdadm RAID marks the array as inactive, instead of degraded

I'm setting up a mdadm raid 1 array on Ubuntu 14.10 under VirtualBox. Everything works fine: The raid 1 is set up with /dev/sdc1 and /dev/sdd1: Personalities : [linear] [multipath] [raid0] [raid1] ...
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207 views

How to link a linux system to an existing RAID1 on 2 external hard drives?

I installed Debian Linux (Wheezy) on a small HDD, added two identical large (2TB) HDDs, and built a RAID1 (without using lvm), using mdadm. I have stored a large quantity of files on the RAID. I run ...
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501 views

MDADM says can't assemble RAID5 because missing disks but all disks are there

To start this, I installed a SATA expansion card so I could get more Drives into the computer. I moved the RAID to the expansion card, after attempts failed to get the OS SSD onto them. There was a ...
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290 views

How to Create Virtual Block Devices

I want to create multiple virtual block devices like /dev/sda and then use them to create an md device for test purpose. I have mounted my root filesystem on /dev/sda1 and don't have extra space to ...
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64 views

Recovering software raid

I have a 3-disk software raid 5. Two disk appear to have failed at the same time; their number of Events is the same, while other third disk's is higher. I have copied all three disks into new ...
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47 views

Safe to blank MBR of a disk after adding it to an RAID1 array with mdadm?

I created a RAID1 array of two disks, /dev/sda and /dev/sdb, using mdadm. After several booting problems related to the BIOS and SATA/RAID controller of the board, I accidently created some new ...
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100 views

How to proceed after creating software RAID 1 array on Linux

So, I've created a RAID 1 array using two 500 GB hard drives. I used a Linux Mint Boot Disk, and then used mdadm to create the RAID 1 array using 2 hard drives, each which has a single primary ...
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504 views

HDDs occasionally “click” and dump this error

Every once in a while, my HDDs (6 1TB drives in a Linux md RAID-6 array) make a brief "click" sound, and I get this from dmesg. I don't really have any clue how to start diagnose this, or even how ...
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436 views

Cloning md partitions for recovery

I have a failed software RAID5 (3x500GB disks) that I'm trying to recover. I don't want to try some of the more risky steps on the actual disks, so I want to clone them to new partitions on a new 3TB ...
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229 views

I reinstalled ubuntu and now I don't see my RAID drive

I originally had a Ubuntu 12.04 system with RAID5 array that I built using mdadm. Due to issues with graphics drivers, the 12.04 system crashed and I had to reinstall the operating system. After ...
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281 views

move mdadm raid to new system

Have a 4-drive Ubuntu mdadm raid in a system whose motherboard (ASUS N1996) failed permanently. I tried putting the 4 drives in another system with a different motherboard, but when it came up it ...
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891 views

MDADM RAID-0 does not increased size after grow on AWS Linux with EBS

I wanted to grew a Raid0 from 2 disks to 3 (each 1TB EBS on Amazon AWS) but the size did not change thereafter. The RAID started with two disks sdc and sdd and the new one was sdf. Here is the ...
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457 views

mdadm one disk sometimes is missing after reboot

On a debian system my home directory is on a raid1 md array. After creation it worked fine for some time, but once the second drive disappeared from the array. # cat /proc/mdstat Personalities : ...
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2k views

New mdadm RAID vanish after reboot

I have problems with mdadm after reboot, I can't reassemble /dev/md0 . I work on debian wheezy. I have done the following steps:: sudo mdadm --create --verbose /dev/md0 --level=6 --raid-devices=4 ...
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338 views

Linux MD software raid stripe cache size

From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory. By increasing this value you can get a ...
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430 views

Can I pass disks through Hyper-V to a Linux VM for md RAID on any hardware?

I toyed with the idea in the past few months of virtualizing a workstation machine (with ESXi/Xen/etc), basically having it run some very basic server stuff behind the scenes; this was more of an ...
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260 views

Failed Software RAID0 on Linux - Attempting to recover data

I have a two disk RAID0 software raid (not hardware raid) that is reported to have failed during boot and my OS won't start. Using a Live CD, I get the following output : sudo mdadm -E /dev/sdc1 ...