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RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

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In essence I want to have two mirror devices but also two copies of the data on each device. Will something like this work and behave as I expect? btrfs balance start convert=raid1,dup,soft /mnt/sdxn/
Microsoft Linux TM's user avatar
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Currently I have a file server running Centos 9 Stream. The operating system is on its own disk and own logical volume group and logical volumes. The are a further 3 disk attached to the motherboard ...
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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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How can you protect simultaneously against bit rot and device failure with Btrfs? Because btrfs only checks data integrity on files when it reads them. The only solution I can think of is using two ...
user324831's user avatar
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i have one problem. I created RAID1 with two discs, then i simulated failure of one of the discs. It was sdb1. I restared the VM with one disc working in RAID array. Then i added new fresh disc to add ...
linuxenjoyer32123'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 ...
Hendra Setyawan's user avatar
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Lets say I have two devices: /dev/sda1 mounted to / (system partition) /dev/sdb1 mounted to /media/data (data partition, usb device may be unplugged) I want to merge/overlay/raid two directories ...
MOHAMMAD RASIM's user avatar
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About a month ago, one of the 4 drives in my array went clicky. I was able to identify the 2nd drive (sdb of sd[a-d]) was the bad drive and thought I failed/removed it. After getting a replacement ...
Jeff Archambeault's user avatar
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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 ...
Rikardny's user avatar
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I have one 8TB and two 4TB disks. I am curious if I am able to create 8TB raid from 8+4+4 disks? I tried this sudo mkfs.btrfs -f -m raid1 -d raid1 /dev/sdc1 /dev/sdd1 /dev/cdb1 but this creates only ...
Eugen Konkov's user avatar
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We experienced a power outage last Thursday morning. Luckily the OMV server is on battery backup, so I was able to shut the server down. Once power was restored, I restarted the server and the RAID ...
Ryan Blankenship's user avatar
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I am trying to recover my data from a 8 year old configuration. 8 years is the last time I tried to mount this configuration but the computer died. The configuration is thus: LUKS encryption on top ...
Mikey A. Leonetti's user avatar
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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 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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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 usually boot my system from a single 250G M.2 NVMe SSD (PCIe 3.0 x4). I also have a 240G SATA SSD and a 640G SATA 7200rpm HDD that I currently use for ad hoc backup. The latter will be replaced with ...
A. Bear'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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I built a soft RAID0 with two SSDs(Samsung-980Pro), and encrypted it with LUKS, since I had only one PC a few years ago. Now I bought a server, and directly disassemble one SSD from the old PC(without ...
Leon'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 array of 8 drives in a ZFS RAIDZ3. While doing a routine scrub this week I had a sudden and unexpected cascade of 3 drives fail over the course of the operation. This was nearly catastrophic,...
Zhro's user avatar
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I accidentally ran sudo rm -r on my RAID 1 mount point. I immediately realized my error, panicked, and hit CTRL+C to cancel. Some damage was already done. The lost+found directory and some of my data ...
KnuppenSasper's user avatar
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I am attempting to mount a disk via a USB docking station. I have been informed that the disk was apart of a RAID1 system, however I see no sign of this so far. Using fdisk -l I can see the disk: $ ...
dwright'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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I have an Nvidia DGXA100 station that I use for my research. It has started to shut down brutally (just a couple minutes after startup), probably a watercooling pump breaking down (that would be the ...
Frost'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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8 votes
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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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Today my RAID5 array status from mdadm --detail /dev/md0 became active, FAILED (I have mobile notifications setup) Most of the files were present but some were missing. This happened before and I ...
Radu Ursache'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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Many resources on the internet contain conflicting information regarding read/write logic for RAID chunks. This answer contains the following (seemingly conflicting) pieces of information: A 512 KB ...
quixotrykd's user avatar
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4 votes
1 answer
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I have heard that RAID 1+0 is more fault-reliant than RAID 0+1, because a secondary drive failure is more likely to cause data loss in RAID 0+1 than RAID 1+0. In the above image, if "Disk 1"...
quixotrykd's user avatar
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-1 votes
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I've added integrity checksum to my root LVM volume using lvconvert command: ~# lvconvert --raidintegrity y --raidintegritymode bitmap ... Is there a CLI syntax to get info/details related to dm-...
frank67'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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Unable to remount 5TB Hard Drive Problem Description I am using a Debian 12 Server with a RAID controller. The harddrives are all set up with their own Virtual drive in RAID0 JBOD. (so 8 Drives, each ...
morm'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'm having trouble with a hard drive that is (supposed to be) a part of a RAID5. Here's is the smart log: smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-107-generic] (local build) Copyright (C) ...
Kasi Mir's user avatar
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I set up a RAID-5 array with my disks plugged into a hub. Then I removed the hub from the setup and plugged my disks directly into the computer. Having done so, I still see my raid device md0 appear ...
Jellicle's user avatar
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I am attempting to resolve an issue regarding the raid controller on my server. What I am trying to resolve is the following error message when I use the tw_cli utility. tw_cli > show No ...
Fuji'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 Synology RT2600ac router with an OWC Mercury Elite Pro (USB, eSATA, FW800) external HDD. The drive is detected as /dev/sdr where any ol' USB flash drive is detected as /dev/sda or sdb. Why ...
MJA's user avatar
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This is driving me seriously crazy: $ doas lsmod | fgrep raid | fgrep ' 0' raid10 73728 0 raid456 192512 0 raid1 57344 0 raid0 24576 ...
q.undertow's user avatar
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First of all, I would like to let you know I come here cause I'm looking for a solution or a way to be able to mount the HOME partition and to read the inside data. I've been running Funtoo GNU/Linux ...
peris's user avatar
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