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A linux utility used to manage software RAID devices.

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I'm using a RAID level 5 array on Kubuntu 25.10. It uses 5 HGST disks and has been active since 2015. This array have survived a hardware migration to a new motherboard as well as continual Linux ...
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I have ordered few ubuntu servers from one provider and need to change raid 1 to raid 0 on system partition Usualy new server has a disc structure And I do a change by following commands from running ...
demon101's user avatar
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I am trying to make mdadm call into a simple bash script which writes a message in the kernel log in case of a state change. I am running on a VM (qemu). The VM is running debian 12.5, and kernel ...
Haris's user avatar
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I am facing an issue with my RAID 1 (mdadm softraid) on an AlmaLinux/CloudLinux OS server, which is a production server with live data. Here's the chronology of events: Initially, I created a RAID 1 ...
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I've been running a RAID1 setup using two Samsung 970 EVO 500GB NVMEs on an Asus Z390 Maximus XI Formula motherboard for the last two years. This is my home server running Ubuntu 22.04 and I chose ...
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This is more informational than a question though someone may have a better answer than the solution I came up with. This was a fresh install of Ubuntu server, literally nothing done other than ...
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My RAID1 array is currently running with 3 disks (2x6TB and 1x3TB). I want to remove the smaller disk and wonder if it makes sense to put it in the safe as cold backup. The idea is to be able to mount ...
treuss's user avatar
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This is on a Iomega IX200 NAS which had been expanded to 4TB disks from the original 2TB. It all looks good. But when I try to save data to a new file I get the "No space left on device error&...
Pro West's user avatar
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I have a debian host configured as a NAS using 6 disks in a RAID 5 setup. The current configuration is as follows: # mdadm -D /dev/md0 /dev/md0: Version : 1.2 Creation Time : Fri Mar ...
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I have a RAID5 array configured with MDADM in Ubuntu 24.04 LTS. The array consists of five 8TB drives, and there have been no changes to it recently. Today I noticed that the array is not accessible. ...
T Shoaf's user avatar
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I'm still relatively inexperienced in Linux and this is my first post here. I configured mdadm raid 10 far acording to archlinux RAID wiki page but with custom chunk size 64K. It contains 2 older ...
Dmk's user avatar
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Edit: Both /dev/sdd and /dev/sde are missing super blocks. I assume this cannot be fixed. I am whipping the drives and starting over. I just finished coping 8TB worth of data to a new raid5 array. I ...
Scott Mayo's user avatar
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I suspect that the answer is no. I also had the UUID of /dev/md0 so I tried to update the mdadm.conf file by adding the line: ARRAY /dev/md/0 metadata=1.2 UUID=b431e078-5d6d-43db-9631-fd1c827406d5 I ...
JackL's user avatar
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I have created software raid5 using mdadm in Debian Linux. Now I want to switch to OpenBSD and interested if I will be able to mount my raid5 under new system?
gio's user avatar
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I found several places suggesting to use btrfs under mdraid (mdadm) or LVM Raid. But nobody expands on how that works when you have data checksum issues! My main concern of not using btrfs native raid,...
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This might be a silly question. But here goes - Some time ago I setup a Ubuntu Server system which contained two identical drives. Both drives were setup during the installation process using LVM + ...
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I've been handed a set of disk images which apparently are Linux MD RAID, asking if I could "reassemble" them. Using a Linux kernel it's as easy as attaching them into partition scanned ...
datenwolf's user avatar
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If I restore a tar archive or do any other bulky filesystem operation I observe kworker running at close to 100% CPU utilization and operations which was done in 10-15 minutes takes a week. When the ...
d.signer's user avatar
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I have a RAID1 array of two hard disks which recently lost one drive, but I can't seem to simply replace the broken one. mdadm --detail has reported that the first drive slot sda has been removed (...
酸柠檬猹's user avatar
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I have a system that has 1x SSD and 2x 4TB HDD working under software RAID1. (I'm currently upgrading from Linux Mint 20 to 22, another topic regarding that issue) On my RAID1 I have LUKS encrypted ...
Rattletrap K's user avatar
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My current Linux Mint 20.3 is soon running out of support, so I figured it's time to install a fresh Linux Mint 22. Currently I have mdadm running two 4TB drives on RAID1 with LUKS. It's been very ...
Rattletrap K's user avatar
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I have an existing raid 6 array where one of the drives failed but, when I try to replace it using mdadm --manage /dev/md1 --add /dev/sde3, mdadm errors and I get the following message in the kernel ...
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I was having trouble with my Ubuntu system that was running a Raid 5 setup with 4x4Tb drives: /dev/sda[1234]. The OS was installed on /dev/sde. So I decided it was time to do a clean install of the OS....
ikbenben's user avatar
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I want to remove raid from my system as I am low on storage and I want to recover the second disk. How can I recover the second disk, I tried but to no avail, here is my current state : root@miirabox ~...
Miira ben sghaier's user avatar
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Is it possible to convert an existing raid0 md device with only one disk to a raid1 md device with one disk in order to add a second mirror disk later? It should be possible online.
WilliWuff's user avatar
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Synopsis Healthy Raid-5 array had 1 drive removed, quickly reinserted and started rebuilding. Then a second drive was removed within 10 minutes. Original drive assignments (sda, sdb etc) have changed ...
MikeD's user avatar
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I have somehow managed to corrupt my RAID 5 array. I am using Ubuntu 24.04, and my existing RAID5 array is on 3 x 240Gb SSDs, and my OS is on a 120Gb SSD. As far as I can tell the 3 raid discs are OK (...
StuartM's user avatar
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I am not the first one with a stuck mdadm --grow but I think that mine is a bit different from the others. In my case all devices are faulty and the state says FAILED: root@linux:~# mdadm --detail /...
Marco's user avatar
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I was a fool and built this mdadm raid5 targeting the device names. Yes, the ones that get randomly assigned at boot. It lasted a few months but is now in a quite odd state, with mdadm --detail ...
Vulcnor's user avatar
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I had raid5 8TB * 4 then ,now I added one more 8TB drive and try to make raid5 grow $mdadm --grow /dev/md128 --raid-disks=5 It comes to 6.1% but it stuck for a few days, and number 482870548 doesn't ...
whitebear's user avatar
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Some really weird Voodoo magic is going on with mdadm in my script: Creating RAID with: mdadm --create --run --level=1 --metadata=1.2 --raid-devices=2 /dev/md/4 /dev/nvme1n1p4 /dev/nvme0n1p4 mdadm: /...
HeartOfGermany's user avatar
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In order to test joining 3 files linearly on my Linux system, I do: fallocate -l 100M file1.image fallocate -l 150M file2.image fallocate -l 50M file3.image and then I run losetup: losetup /dev/...
user447274's user avatar
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I've spent hours fighting mdadm to the point I had to reinstall linux and do more fighting, mostly because of write-protected issues on the drives somehow (I still don't explain it), and also ...
Mister Mystère's user avatar
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I received a warning during bootup that a hard drive has failed. My first thought was it's probably one of the two older HDDs I have configured as a software RAID1 array. So as soon as the boot ...
1337ingDisorder's user avatar
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I am not an educated computer guy, so please be gentle with me :) I have a server I use to run plex with sonarr and radarr. I am trying to create a raid array on it. I have 10x 12TB drives and I want ...
armybill's user avatar
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I'm facing an issue with my RAID 0 setup on Linux. I've created a RAID 0 array with 4 disks, but after a few hours of activity and several system reboots, Linux changes the /dev/sd* directives used in ...
Josué Suptitz's user avatar
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Context I have a software RAID5 array (mdadm) on 3 disks. Last week, one disk started to get reading issue: # dmesg ata3.00: exception Emask 0x0 SAct 0x30000001 SErr 0x0 action 0x0 ata3.00: irq_stat ...
BiBzz's user avatar
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I have a 3 RAID arrays on my Linux server. root@master:~# lsblk -b NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS loop0 7:0 0 21474836480 0 loop loop1 7:1 ...
Daniele Testa's user avatar
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Have a new Linux server with a dual SAS attached 60 bay JBOD filled with 20TB (18.2 TiB) disks. I am definitely running ZFS but trying to figure out whether to use small raidz1's, bigger raidz2, or ...
raines's user avatar
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i would like to recover some data from a disk which was part of a MD RAID 1 Array in an old fileserver. Drive 1 had a HW issue and it seems that drive 2 stuck in a Rebuilding State. My idea was to get ...
csiko's user avatar
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I have a software RAID 5 with 3 disks. For a few days, sda has been giving errors, and today the new disk arrived. I launched mdadm --replace and the process started correctly, but due to read errors ...
Gabriel Rolland's user avatar
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I setup my Raid-0 mdadm raid array a few years ago when I setup my arch install following this guide https://wiki.archlinux.org/title/RAID#Installation while also googling and asking questions ...
Gabe Spound's user avatar
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I installed a new disk today and was prepping it, before realizing that I'd done my "prep" work on an existing RAID1 array!! I'd LOVE to be able to recovered if possible. My array was ...
Vince's user avatar
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I have a Debian server (latest version and all security updates done) and 3 years ago I created a RAID-5 over 3 disks with mdadm. It still works but I now get an error from the tool logwatch. Just ...
Marco's user avatar
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I previously created a RAID 1 array using mdadm. One of the drives is failing and I have removed it. I would like to continue using the remaining disk while waiting for a replacement disk. I don't ...
mdhuke's user avatar
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I'm posting on the StackExchange Unix&Linux community board first, as it seams to be the most likely place for the type of answers I'm looking for. I'm hoping that someone can point me in the ...
Xyhfna's user avatar
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I have looked and looked for other people with my same problem, but all the questions here seem to be about entire RAIDs disappearing after reboots, whereas I have a problem with just one member drive....
schtocker's user avatar
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I have a server with 8 disks setup with Linux RAID where the boot partitions are RAID1 and the root and partition where I keep VM images are RAID10. I need to replace with larger disk and grow the ...
rwfitzy's user avatar
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Notes: I read How to convert SW MD RAID1 arrays to LVM mirrors? but wanted to pose the question as that is quite an old post. This is my first post. I have a sw RAID1 (2 8TB HDDs that present to ...
stauntonjr's user avatar
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This is my /etc/mdadm/mdadm.conf ARRAY /dev/md/root metadata=1.2 name=root UUID=331728d9:c4d12r4f:f589d3ze:01ab3c17 ARRAY /dev/md/backup metadata=1.2 name=backup UUID=429845f1:d5e24f5g:8135dgte:...
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