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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 ...
David Fuller'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 ...
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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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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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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 ...
Frederik Hoeft'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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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 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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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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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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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 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....
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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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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 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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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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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 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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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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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 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 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 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 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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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 ...
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