Questions tagged [raid]

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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How do I restore redundancy to an LVM-RAID volume

I have a logical volume (home64) that spans several drives that was converted to RAID1 using lvconvert. This was fine, and when a drive failed, it carried on. Now I'm trying to replace the drive ...
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How can I limit the number of data stripes in a btrfs RAID-0 profile in order to better utilize the total available space?

Problem background One great thing about btrfs is its ability to effectively use drives with different sizes, but I just learnt that this is not true for its default RAID-0 (striped) profile. I wanted ...
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MDADM and lib-virt KVM. After restarting KVM host, RAID devices disappear, and cannot be re-assembled

I have managed to establish that restarting my hypervisor somehow causes the raid setup on the virtual host to break. Here's what I did created multiple RAID 1 devices on the virtual host I can ...
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Can I decide which drives will be removed when reducing number of drives in RAID6 array?

I have a RAID 6 array of 7 drives, 4 TB each. I am replacing them one by one with 8 TB drives. I know how to grow my array when all of the drives are replaced. The larger drives have 8 TB partitions, ...
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Identify Raid Failed Drive “serial number” and “Mount name” export to txt

I want to write bash script or php file to export output file status.txt of failed raid (hard disk serial no) and (mount name) or "OK" I tried some code below far from finish desired 2 ...
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Two disks MD RAID 1 setup running with one disk

I have MD RAID 1 with two disks but one failed and will be replaced soon but till this time is it possible to set the raid to active to access my files because now the state is inactive ? Thank you. ...
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SSD/NVME friendly MD RAID1 rebuild in Linux

I use SSD and NVME RAID1 arrays to store mostly virtual machine disks. More than 75% of the data are zeros (preallocated images, free space). If a disk fails and gets replaced, the rebuild copies and ...
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Can a MegaRAID VD be set offline to hot-remove it without failing the VD?

We have a VD in a MegaRAID controller (Dell H800) under Linux that we would like to remove from the enclosure without failing the array and without powering down the enclosure. (There are multiple VD'...
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Wrote to one disk of raid array, files truncated, trying to recover data, arch linux

I'm trying to recover some data from a corrupt RAID1 pair and wanted some advice before I make matters worse. This is how I caused the problem: I wanted to save some data prior to reinstalling my OS. ...
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mdadm RAID 10 filesystem corruption — recoverable?

PROBLEM: I had a degraded disk in my RAID 10 array which I created using mdadm. I first removed the disk, replaced it with a new one, but when I rebuilt, I got an error saying it couldn't detect the ...
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Is it possible to keep data in procedure Raid1 growing to Raid5?

I have Raid 1 /dev/sda /dev/sdb as md0 then now I want to expand for Raid5 So, my idea is sudo mdadm --add /dev/md0 /dev/sdd sudo mdadm --grow /dev/md0 --level=raid5 --raid-devices=3 In these ...
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RAID1 primarily used disk

I'm kinda new to the setup of raid-drives. So my current setup looks like this: Disk1: 1x NVMe DataCenter Edition 960GB ("low" IOPS) Disk2: 1x NVMe Octane 480GB (high IOPS) Disk 1 has 3 ...
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Systemd: Fix ordering cycle when mounting an NTFS volume on a legacy raid array at boot time

Problem I have what the mdadm man page calls a "legacy array", i.e. a raid array without superblocks. I finally managed to make systemd mount my data partitions within at boot time, but ...
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SLES 11 doesn't boot after RAID controller replacement

I need to fix a server (SUSE Linux Enterprise Server) that stopped booting correctly after a piece of hardware, responsible for RAID, got damaged and replaced. The booting process was getting stuck on ...
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Reading Linux_Raid NAS on macos

I extracted an HDD from a NAS since it stopped working. Examining on Mac terminal I get this reading: Terminal Reading I'm only able to mount with extFS for Mac disk5s1 which basically contains the ...
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Debian mdadm RAID - rebuild and level modification

I would like to build a new NAS and run Debian on it to make the files available with Samba. I would like to use RAID5 and RAID6. I read that mdadm is the right tool for this and how you can set it up....
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Recovering failed RAID5

md0 : active raid5 sdc2[5](S) sda2[4] sdd2[3](F) sdb2[1] 17510688768 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/2] [UU__] What happend: sdc failed I have repleaced it with a new HDD ...
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RAID1 no suitable drives found

I have a synology NAS with 2 disks configured in RAID1. Somehow the RAID array got messed up. I plugged the 2 disks into my desktop computer to investigate what's happening: # mdadm --examine /dev/...
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Is it possible to install Debian on a RAID5 array? GRUB failing to install

I have a Dell Optiplex for which I purchased four 4TB disks. I am trying to install Debian 10 on this machine. I'm hitting a wall when it comes to installing GRUB. I get vague error at this point of ...
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How to compare RAID mirror elements?

I've got a RAID mirror (md1) with three devices (sdc, sdd, sdf). Something went wrong overnight, the array went readonly, and fsck found thousands of inodes with inline_data_fl set and/or on the ...
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OpenBSD installation script does not recognise SATA-connected drives

My question is one that has been posted here before but merits a new thread since the solution given did not work for me. During the OpenBSD installation, only one device is recognized as a candidate ...
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Chunk Size in RAID

I looked up some explanations on this parameter, but there is a lot of contradictory/outdated information around, and I still have doubts. So, my understanding is that the chunk size is basically the ...
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raid disk showing under specialized and network disks

I have a supermicro server and i am trying to install the centos OS on that server. I have configured raid 1 on the OS disks, however i could not see the disk under local disks but its showing up ...
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Newly created mdadm raid 6 cannot be mounted

I have a newly created mdadm raid 6 that was built using this command: sudo mdadm --create --verbose /dev/md127 --level=6 --raid-devices=8 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1 /dev/sdm1 /dev/sdn1 /...
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RESOLVED: EXT4-fs (md1): unable to read superblock - really want to avoid data loss

my level of Linux knowledge is very light (I'm learning) and I've got a problem that's beyond my level of Google-Fu. I'm well out of my depth and I'm hoping somebody might be able to help me... I'm ...
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mdadm RAID array gone after reshape and reboot

My mdadm RAID5 array just underwent a 5>8 disk grow and reshape. This took several days and went uninterrupted. When cat /proc/mdstat said it was complete I rebooted the system and now the array no ...
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Raid 5 overwritten with Fedora server installation

I have mistakenly installed Fedora server on my RAID 5 rahter on a SSD. Now the raid is not mounting: # mount /dev/md0 /mnt/raid mount: /mnt/raid: wrong fs type, bad option, bad superblock on /dev/md0,...
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Starting RAID array manually

Is there any way to start a RAID array manually without rebooting after stopping it via mdadm -S?
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Restore Hardware RAID5 using 'mdadm'

I have a Hydra LCM RAID device with 4 Bays (4x 2TB Hitachi). I was running it in RAID5 mode since 2010. Last year in May the device was starting giving messages that one drive was degraded and I ...
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What is a good way of automatically checking HDDs health

I just configured a raid5 server setup containing three hdds /dev/sda /dev/sdb /dev/sdc What is a good practice unix way of automatically checking the health of these drives and alerting the admin if ...
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Shrink raid6 array which is one component of a btrfs multi-device file system

Okay, here's my situation. I'm on a limited budget now (as always) and I'm trying to fix an issue. I've had my main fileserver run into file corruption issues while trying to make a backup to my ...
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Setup RAID10 (mdadm and/or lvm) starting with three empty disks, then add fourth disk (has data in it)

Please, tell me if it is possibile to create RAID10 (near layout) with odd drives and then adding even(th) disk to that existing RAID10. TOTAL: 4* 2TB drives (sdc,sdd,sde,sdf) FREE: 3 of them (sdd,...
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Creating RAID arrays on files instead of block devices

Is it possible to create a RAID array on files for testing purposes? Suppose I want to create a level-1 RAID and I don't have for example 10 block devices to do that but instead I want to simulate ...
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mdadm raid issues with (possibly out of date) and tries to mount raid6 as raid1

Some unknown hardware issue occurred that looks like it took all 4 hard drives offline occurred. wiggled some wires and hard drives are back (???). Now having raid issues. Raid will not start "/...
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mdadm - how to rebuild raid array after fresh install?

I used to have a raid1 array on the mountpoint /mnt/md0, however I re-installed my OS and now I don't know how to re assemble it. I believe I should be doing something along the lines of mdadm --...
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Raspberry Pi 4 unmounting half of RAID10 drives after reboot

So here is the situation. I am running Debian 10 on my machine, and I wanted to assemble a RAID10 setup for 4 USB drives connected to my machines ports. I setup the configuration with the command sudo ...
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lun on raid 6 recoverable?

Raid 6 was on 8 drives, 2 failed. Qnap rebuilt the raid on 7 drives, raid rebuilt on new drives one at a time. That was a week ago and they've gone silent. Reaching out to see if anyone else can ...
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Unable to mount and read data due to unsupported optional features, wrong fs type, bad option, bad superblock, etc

I'm trying to either recover the data or repair the disk(s) from a 2 disk RAID 1 setup. While migrating the data from the RAID (/dev/sdd1) to another pair of disks, the machine locked up during the ...
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How do I recover the partition table on linux raid

I have a Linux raid (those md device), it only contains one drive, and it has a btrfs patition on it. I accidently do the following thing: fdisk /dev/md126 I didn't see the warning The old btrfs ...
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Replacing a physical volume in a LVM/RAID configuration

Let's say that I have a RAID-5 logical volume vg00/lv00, with three physical volumes /dev/sda, /dev/sdb and /dev/sdc. I want to replace /dev/sdc with a new drive. I want to do this in two scenarios: ...
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How to add extra mirror drive to existing raid array using mdadm?

I created an array with: mdadm --create --verbose /dev/md3 --level=mirror --raid-devices=2 /dev/sdc1 /dev/sdd1 The above has now completed succesfully. Now I want to add an extra drive to end up ...
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42 views

Repairing Bad Blocks on Linux RAID5 Array - Used Drives

TL;DR: Are the second-hand drive that I've purchased, safe to use for a copy of my backup NAS? I bought four Western Digital 3TB Red HDDs second-hand and have put them into a spare microserver that I ...
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Apparently destroyed RAID array by running fsck on HDD partitions. What can be done?

Ubuntu 18.04 Desktop. 5 x 2TB disks in RAID 6 array. lsblk sda 8:0 0 2.7T 0 disk ├─sda1 8:1 0 512M 0 part /boot/efi └─sda2 8:2 0 2.7T 0 part / sdb 8:16 0 1.8T ...
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Splitting OS on V-NAND and storage on RAID card with Debian 10

after many years I'm rebuilding my home server. The server is used primarily as a file storage unit, which also has Emby and Logitech Media Server to stream audio/video across the house. Video files ...
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Recovering raid 10 drive md0 after upgrading from Ubuntu 16.04 to 20.04

I just upgraded from Ubuntu 16.04 to 20.04. In my computer I have 4 X 1TB HHD in a raid array. They are sda, sdb, sdc, and sdd = md0 This raided drive contains my home directory, which in my case is /...
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Boot Message after “RAID: Clean”-Message: “Failed to send exit request: Connection refused”

I just installed Manjaro on a (md-adm) RAID10 consisting of two Samsung 970 Evo Plus NVMe M.2 SSDs. During boot, the following message flashes up twice. What could it mean / what does it tell me? ...
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Why do 5 drives disappear when I scan for them?

I am trying to diagnose why my raid6 array of 20 hard drives stopped working on my ubuntu installation. I noticed that when I tried to force it to start, several drives simply stopped being listed in ...
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125 views

mdadm raid resync

i have a raspberry pi with two USB thumb drives that are in a mirror raid array and store my data that I share using Nextcloud. Now randomly, I caught today that one USB drive LED was flashing without ...
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Accidentally executed luksFormat instead of luksOpen

I have two disks as RAID-1 encrypted via LUKS: # blkid ... /dev/md0: UUID="x-x-x-x-x" TYPE="crypto_LUKS" Accidently I executed cryptsetup luksFormat /dev/md0 instead of cryptsetup luksOpen /dev/md0 ...
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Optimize raid drive for disk read

I have a Hardware RAID10 setup at home for my home server. I run a Plex Media server and a Nextcloud cloud server for my family at home. My concern is, that when I am downloading a movie (heavy disk ...

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