Questions tagged [mdadm]

A linux utility used to manage software RAID devices.

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Ubuntu Not Starting Second RAID Array

Before I start let me say that I am by no means an expert with this stuff, if you see something that you would have done differently let me know. Ok, so I have a Ubuntu 18.04 server with a boot drive ...
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RAID Arrays are not assembeling after 2nd reboot

I have an issue where i assemble RAID0 over RAID6 via mdadm as normally, after that i can create file system and mount newly made RAID60 arrays no problem. I update my mdadm.conf, update initramfs an ...
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How to convert swap partition from RAID1 to RAID0 using mdadm

How to convert linux SWAP memory from RAID1 to RAID0? Start with:2 exact size swap formatted partitions (/dev/sdc5 and /dev/sdd5) on 2 physically separate disks that are used via Software RAID(named ...
dankilev's user avatar
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Missing mdam RAID1 array during scan

I have built a new server (Ubuntu 18.04.1) with 4 HDD. My plan is to use RAID1 overall and came up with this layout after investigation: sda, sdb four primary partitions (all as fd) with sda1/sdb1 ...
IgorLopez's user avatar
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How to pre-emptively repair/replace drive in linux md array without going degraded first?

I have (had, it's already been swapped out, asking this for future use) a drive that is indicating pending failure with internal SMART tests and bad block remaps. It is straightforward to mdadm --...
Nathan Neulinger's user avatar
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Missing raid device in /dev/

I have two sata disks: /dev/sda and /dev/sdb. I have 4 partitions: /dev/sd[ab]1 /boot /dev/sd[ab]2 swap /dev/sd[ab]3 / /dev/sd[ab]4 /home And all of them are in raid1. Raid is working fine. Here is ...
Krzysztof Miksa's user avatar
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Enable new disk in raid

I had a server with 2 disks in a raid and one of them failed. Called the provider and had them change the disk. After a reboot I still see only one disk: cat /proc/mdstat Personalities : [raid1] [...
Theis's user avatar
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md raid fails to boot with missing drive

I got a server with Debian Jessie, 4 Drives sda to sdd all of which are partitioned likewise. The system is in a raid1 md raid over all drives. All drives do have grub and I can swap discs with each ...
bardiir's user avatar
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Is It Bad Practice to Run 3 Copy MD Raid10 Array in Degraded State?

Is it bad practice to run a 3 copy MD RAID10 array on two drives with a missing drive in place of a 2 copy MD RAID10 array on two drives to allow for the addition of a third drive in the future? We ...
Damon's user avatar
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Bad continuous write performance on RAID-5 when not writing huge amounts

I had some problems getting acceptable read/write performance for my RAID5 + crypt + ext4 and was finally able to track it down to the following problem: Hardware Hard disks 4x WD RED 3 TB WDC ...
Kai Giebeler's user avatar
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Server rollbacked after apt-get upgrade and a restart

Today I was trying to find out why my server stalled after certain amount of requests on apache2, but couldn't figure why, so I decided to upgrade it(apt-get update & apt-get upgrade) before I ...
Ruuhkis's user avatar
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RAID10 with 24 drives on Linux

I have an Ubuntu server with attached 24x1TB drives, which I would like to use for storage. I would like to use RAID10 with ext4, but all examples I saw (such as http://www.emind.co/how-to/create-...
Gilad Novik's user avatar
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Different free disk space figures in df output after complete rsync -Sap transfer

I did "rsync -Sap --numeric-ids --delete-during /mnt/RAIDVault/ /mnt/RAIDVault-BACKUP/" intending to bring two storage units in sync (having identical content) but ended up with different amount of ...
ILIV's user avatar
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RAID1 write penalty using mdadm - what's the cause?

When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
sa289's user avatar
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Power outage during RAID1 build [closed]

I was 60% complete building a two-disk RAID1 on my Ubuntu 14.04 server with the command sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1 when I accidentally ...
buttonsrtoys's user avatar
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How/When to physically remove a failing harddrive after replacing it in a Linux RAID?

I have a Linux software RAID-1 with mdadm. Similar to this question ("How to safely replace a not-yet-failed disk in a Linux RAID5 array?"), I want to replace a disk in a the raid. My question might ...
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Can't mount my hard drive

When I try to mount one of my hard drives, it can't locate the folder with the hard drive. This is the output for the command df: Filesystem 1K-blocks Used Available Use% ...
Casper Rasmussen's user avatar
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RAID 5 reshape freeze

I recently added a new disk to my RAID5 array and started growing it. Absent minded as I am I rebooted the server during this reshape process I as another program was hung and blocking some ports. ...
while's user avatar
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Proper way to identify member devices in mdadm.conf

My current mdadm.conf looks like: $ cat /etc/mdadm/mdadm.conf DEVICE /dev/sdb1 /dev/sdc1 ARRAY /dev/md0 metadata=1.2 spares=0 UUID=357ff7cc:55e78d18:9fc7917b:f5b253f2 MAILADDR [email protected] Since ...
davide's user avatar
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Remove a drive from a 2-drive RAID 5 array using version 1.2 metadata?

My situation is nearly identical to "How to remove a drive from a non-standard 2-drive RAID 5 array?", except my 2 TB RAID5 is using mdadm super block version 1.2. According to the best answer, "...
ryank's user avatar
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Shrinking LVM Volumes

We have a Synology RS3614rpxs NAS head containing (9) 3TB hard drives in a RAID 6 + 1 hot spare. The storage became exhausted and we added an expansion chassis where 5TB hard drivers were installed ...
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Mounting device from degraded RAID 1

I am trying to mount device form raid 1 (created on other device), because I need to copy data from this disk. When I am trying to assemble new array i get a message: foo@bar# mdadm -A -R -v /dev/...
Karaal's user avatar
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MDADM - Raid 1 - Change a disk with a smaller one

I have a Ubuntu server with the operating system installed on a raid1 created with two 500GB devices. the second drive failed. I now how to replace it, but my goal now is to move the operating system ...
jul's user avatar
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mdadm array is active but is not listed

I am running Ubuntu Server 12.04. I did apt-get upgrade and received a warning from mdadm. update-initramfs: Generating /boot/initrd.img-3.11.0-24-generic W: mdadm: the array /dev/md3 with UUID ...
Ripster's user avatar
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CentOS System Recovery : Overwritten RAID Superblock and porting to new hardware

I have a failed system running on CentOS 6 and would like to attempt recovery of system. One problem it has is the mdadm superblock appears to have some issues, it has all sorts of inconsistent ...
supmethods's user avatar
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Growing a raid 1 with mdadm

I have a RHEL 6.5 box in which I have recently added two partitions to the a raid 1. It took the the disks without any incidents but I am not able to resize the raid itself. The output of cat /proc/...
Marcelo's user avatar
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Expanding raid 5 luks partition

I have just bought 2 new drives to my raid 5 array. I have successfully added them to the array and resynced. I now have a /dev/md4 drive that is 16 TB, but the crypt-luks partition md4p1 is still 12 ...
prinsen's user avatar
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Re-mount EBS vol on EC2 instance

I am new to sysadmin. I am trying to launch a EBS-backed EC2 instance. I did the following based on mongodb docs: sudo mdadm --verbose --create /dev/md0 --level=10 --chunk=256 --raid-devices=1 /...
www.tyme-it.com's user avatar
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1 answer
740 views

mdadm raid6 array reports incorrect size in df -h after grow

I've recently grown a 5x 3tb mdadm raid6 array (8tb) with a sixth disc in fedora 18, and after full rebuild and check, "mdadm --detail /dev/md127" returns the below: Version : 1.2 Creation ...
Faufnir's user avatar
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Linux software RAID 10 array, failed drive, resize file system and migrate to a 3 drive RAID 1?

I have a software RAID 10 array which I recently noticed went into a degraded state. The OS is CentOS 5.8. It has 4x 500GB drives in 3 different arrays: /dev/md0 is RAID 1 and mounted to /boot (200MB ...
batfastad's user avatar
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Ubuntu 12.04 LTS Update - With Error: "YOUR SYSTEM IS NOW UNBOOTABLE!"

I just did an apt-get dist-upgrade and saw the following error: cryptsetup: WARNING: failed to detect canonical device of /dev/md1 cryptsetup: WARNING: could not determine root device from /etc/fstab ...
Ian's user avatar
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Software Raid 10 corrupted superblock after dual disk failure, how do I recover it?

I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os ...
Shoshomiga's user avatar
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1 answer
2k views

Controlling mdadm faulty disk rebuild order in RAID 10 array

I have a Linux mdadm RAID 10 array comprising of 6 (SATA) disks configured with n2 copies. While pulling out one disk, another one in another mirror pair failed. Leaving me with: $ cat /proc/mdstat ...
Alastair McCormack's user avatar
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1 answer
2k views

What parameters to mdadm, to re-create md device with payload starting at 0x22000 position on backing storage?

I try to recover from mdadm raid disaster, which happened when moving from ubuntu server 10.04 to 12.04. I know the correct order of devices from dmesg log, but given this information, I still cannot ...
Adam Ryczkowski's user avatar
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1 answer
5k views

Rebuild Linux raid1 after os reinstall

I have 4 disks in my server. sda and sdb were combined to RAID1 and had the operating system. sdc and sdd were a second RAID1 device that had a single volume group with a bunch of LVMs. sdd died so ...
John P's user avatar
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Build and migrated to software raid (mdadm) on GPT disk, now can't assemble array

mdadm, gpt issues, unrecognized partitions. Simplified question: How do I get mdadm to recognize GPT partitions? I have been attempting to convert/copy my Ubuntu 11.10 OS from a single drive to ...
ytjohn's user avatar
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1 answer
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Linear mode to RAID 1 migration

Consider creating a linear mode RAID with single disk(more disks may be added later). #echo y | mdadm --create /dev/md0 --level=linear --raid-disk=1 /dev/sda1 --force Now consider another partition ...
kumar's user avatar
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3 answers
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howto import existing linux soft array volume group

I have a server that consists of a boot drive, then two data drives combined to a RAID1 linux array. My boot drive recently became corrupted and I need to re-install the operating system. The RAID1 ...
John P's user avatar
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mdadm Build legacy array with 512-byte chunk

I'm attempting to build an array using mdadm. The array has 512-byte (not kibibyte) sized stripes. Because mdadm accepts arguments to chunk in kibibytes, not in bytes, I have been unable to build ...
OmnipotentEntity's user avatar
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1 answer
3k views

Linux software RAID: --auto-detect finds whole drive, not last partition

My laptop, running Ubuntu Natty, is partitioned like so: /dev/sda1: 500MB, /boot /dev/sda2: 148GB, / sda2 is a software RAID1 with 1 device. This is intentional -- I periodically reshape the array ...
Ian Howson's user avatar
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1 answer
207 views

New Raid-1 array rebuilding 2nd time after activation

I created a sofware raid-1 from existing data partition using this howto. Both disks are usb 1TB disks, (each had already two partitions and I used 2nd from each, they have same size) So I simply ...
groovehunter's user avatar
1 vote
2 answers
514 views

HDD-Errors while building Software-RAID5

I want to build up my new NAS with CentOS 6 or Scientific Linux 6, but I am not able to build the RAID5. I created a new RAID-device using mdadm, but after some hours of work, mdadm marked one or two ...
Dani31's user avatar
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1 vote
2 answers
360 views

Re-assembling the RAID-5 array reboots my CentOS-5 machine

I have 3 HDD's, each divided into 3 partitions. I had created a RAID-1 for boot partition md0 created from sda0, sdb0 and had also created two RAID-5 arrays: md1 created from sda1, sdb1, sdc1 md2 ...
xraminx's user avatar
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MDADM Array Being Limited to 2.0TB

I have an MDADM array with four 1TB disks in a RAID5 configuration. Here's the relevant part of mdadm --detail /dev/md1: Version : 00.90 Raid Level : raid5 Array Size : 2929537920 (...
Brad's user avatar
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1 answer
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Generate a new Volume ID in Linux

Sparing most details/reasons, I have a situation in which I'm cloning drives for mass production. Some of them are being installed in servers that only need one disk (in that case this is a non-issue)...
andyortlieb's user avatar
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1 vote
3 answers
1k views

mdadm & raid6: does "re-create(with different chunk size) + resync" destroy orig. data?

I would like to rescue data on my software raid-6 array. I did some stupid actions (described bellow) with this original array. Main Question: I need to know if original data stored on raid-6 array ...
schanhorst's user avatar
1 vote
2 answers
369 views

Can I prevent a Linux server from locking up/spewing console errors when a hard drive fails?

I have a Linux server (CentOS 5.5) that has two identical IDE hard drives. I've used software RAID (mdadm) to create mirrors for each filesystem, so that either hard drive could fail and no data would ...
bjnord's user avatar
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1 answer
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How to make partition, raid5 and filesystem on 6x2TB WDC-drives in Linux

I'm getting confused by this "Advanced Format" (4KB sectors) talk of bigger (2TB) drives - and I am wondering about how I would resolve this if I'm building a new software (mdadm) RAID-5 array. The ...
user avatar
1 vote
3 answers
4k views

Recovering Linux RAID 0 superblocks

So I've been handed these 2 drives that were part of a RAID0 (eek!) array in a NAS. One of the drives had failed. Turns out, the drive had a bad controller card. What I've done is copied the ...
Jason Berg's user avatar
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675 views

How to create partition when growing raid5 with mdadm

I have 4 drives, 2x640GB, and 2x1TB drives. My array is made up of the four 640GB partitions and the beginning of each drive. I want to replace both 640GB with 1TB drives. I understand I need to 1) ...
hometoast's user avatar
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