Questions tagged [mdadm]
A linux utility used to manage software RAID devices.
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RAID1 drive vanished, but could be re-added after reboot. Should I be worried?
I am running Debian 12 with an MD RAID1 array (2 drives) for my personal data (no system files on array).
Today I got a mail from mdadm about a DegradedArray event, during a time where my drives are ...
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Really slow FIO random 128 MB read values for a RAID 10 XFS
I've just installed two Samsung 970 EVO Plus drives, and configured the biggest partition as RAID 10 (far 2 layout). The problem is FIO only reports a read speed of 72 MB/s. I used the following ...
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MDADM Chunk values
I've a RAID 10 array made up of two SSDs using mdadm on linux,
I created it with
mdadm --create --verbose --level=10 --metadata=1.2 --chunk=512 --raid-devices=2 --layout=f2 /dev/md/MyRAID10Array /dev/...
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mdadm raid1 showing removed disk
I have a dedicated server which consists of two hard drives with 5 partitions each.
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 1.8T 0 disk
├─sda1 8:1 0 1M 0 part ...
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How do I get my raid array back and mounted after reboot
I had created a raid-1 array for two drives (sde and sdf) using the normal mdadm process and had created it under md1 and mounted it to /mnt/storage. After a reboot md1 no longer exists. My /mnt/plex ...
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mdadm --zero-superblock for all devices of a mdraid?
I found no way to remove a mdraid from a server with one command.
I can stop it via mdadm --stop /dev/md0
But the superblock is still in the devices.
mdadm --zero-superblock DEVICE needs every device (...
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Ubuntu 22.04.3 LTS running mdadm 16 x 8TB Raid 6 - Is it possible to upgrade individual disks and use the space immediately without using LVM?
Some more background... I have 4 realtime arrays (always running for me to use) - the 2 big important arrays (40TB [20TB used] and 112TB [105TB used] are being backed up onto a 16 x 8TB Raid6 array (...
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Mdadm Raid5 kicking non-fresh drive from array
I set up a mdadm raid5 with 3 drives initially: sdc1, sdd1, sde1. They array creation was successful without issues. Later I decided to extend the array using one more drive. After proper partitioning,...
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mdadm copy superblock from drive to drive
i have an RAID5 consisting of 7 HDDS. One Drive is only partially accessable anymore.
Unfortunatly i used the create command which resetted the superblocks of the 6 healthy drives.
is there a way to ...
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Replacing a single SSD in 4 disk mixed software RAID 1 & RAID10 system
I'm about to replace a single SSD in a 4 SSD RAID 1 & RAID10 system. My webhoster will only do the drive replacement, but not help with adding it back to the array after. I've not done this before,...
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setup Raid1 on running system
I have 2 disk sda and sdb with several partition. I have to make a raid1 of the running system. I managed to setup raid1 with md0 on root but there are 2 more partition which are mounted on /home and /...
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Reassign drive index number of mdadm software raid devices
My RAID 1 array has two disks as stated by # mdadm --detail /dev/md0
...
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Number Major Minor RaidDevice State
5 8 32 0 active sync /dev/sdc
4 ...
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Convert MDADM RAID disk to non-raid disk
I have an existing RAID1 disk that is my boot & root drive locally. I want to convert this disk to a non-RAID disk and allow boot & root to be mounted without mdadm. What is the best way to ...
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Restore 4-Drive RAID5 array after accidentally reinitializing last 2-Drive as RAID0
I have an Asustor NAS with RAID 5 4-Drive running, after system update it reboot into the initialize page in web console, I think it's part of the upgrade process so I started the initialize progress, ...
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Cancel `md --grow` operation
I added drives to an md RAID5 array, and quickly realized that I forgot to create a partition as is best practice (something I’ve also learned from bitter experience). How can I cancel this operation ...
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RAID arrays failed, now will not restart; mdadm --examine shows drive healthy but --assemble fails missing two disks
This is a Mint 21.1 x64 Linux system, which has over the years had disks added to RAID arrays until we now have one array of 10 3TB and one array of 5 6TB. Four HDs dropped out of the arrays, two from ...
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/dev/md0 - wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error
I recently had issues with a raid filesystem I created and had some bad luck.
I started creating a raid0 one one disk with the intent to expend it afterwards. I had data on two drives and had only one ...
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Temporary disconnect of HDD in RAID 0 array
I have a blade server on Rocky Linux 8 with 5 18TB WD Gold HDDs in a software RAID0 built with mdadm. I will accept all the lectures on this and change my ways if you all can help. I needed coffee ...
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Why is existing RAID1 boot array not working in new PC
This question maybe related to this: https://askubuntu.com/questions/1347710/disappeared-raid-1-array-after-replacing-motherboard
I created a software RAID1 array with 2 SSDs on an HP Z800 and ...
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Transferring RAID1 to a new motherboard after HDD failure, and no "Superblock" found
First an OS SDD failure followed by a mobo failure, new mobo/cpu/ram later, and I have a RAID1 with a single working disk, and I am trying to get it remounted so that I can add in a new replacement ...
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Raid6 mdadm reshape operation interrupted - now cannot mount or examine
Edit: Once the reshape finished the drive became fully accessible again.
I had a power failure while a raid6 array was being reshaped, and now certain operations cannot be run against it, including ...
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qemu virtual machines slow during RAID5 check
Operating system: CentOS 7.9 (on both host and guests)
Host specs:
CPU - AMD EPYC 7502P 32-Core Processor
RAM - 250 GB (only 22G used by all VMs)
Disk - Four Samsung SSD 870 QVO 4TB, grouped in a ...
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Recreation of mdadm RAID backing store for drbd yields *The peer's disk size is too small!*
Some years ago, I've set up a storage cluster with stock Debian Linux using mdadm RAID as backing store by using the Debian provided drbd 0.8. Currently there are two RAID6 volumes, comprised of some ...
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mdadm RAID1 degraded but shows active partition on non-present drive
I ran into an issue with a degraded mdadm RAID1 array on a server I inherited:
The server has two identical M.2 SSD drives with 256GB capacity each in a RAID1 config via mdadm for the operating system ...
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md Raid6 array disapeered on reboot
my raid6 array disappeared on reboot after I grew it. I believe the issue was growing 2x with the full disk not partition. It has been suggested a possible other reason the drives were not correctly ...
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mdadm resync slows down to 0K/s over time
I have a problem with resyncing my raid1. Everything worked fine until now and I don't know what the problem is.
When I reboot my machine the speed of the resync is at about 100000K/sec but over the ...
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mdadm RAID5 mismatch, which file(s) on ext4 filesystem are affected?
After a scrub of my 4-disk RAID5 mdadm array I got these log entries:
Dec 03 07:20:53 srv10 kernel: md1: mismatch sector in range 204340608-204340616
Dec 03 07:20:53 srv10 kernel: md1: mismatch sector ...
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Removed failed disk from
I have a problem with a software raid running mirror. One disk is dead and the server cannot find it. Normally I would have removed it as well.
mdadm --manage /dev/md0 --remove /dev/sda1
But after it ...
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Growing a RAID-10 on Synology NAS?
I was hoping to add two additional disks to my Synology NAS. Currently it is configured as a four disk RAID-10, no SHR, BTRFS, single volume system. Unfortunately extending a RAID-10 is not possible ...
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mdadm array state not fully active - faulty device
I use 4 drives as a raid 5 on my Raspberry Pi. I shutdown my Pi every night and start the next morning. Sometimes the array appears to be faulty. Maybe the Pi doesn't properly mounts the drives ...
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Can I make hotremove/add on raid5 with mdadm?
I created and assembled software RAID5 array (mdadm), 15 SSD disks.
If I physically remove several disks and add them back, RAID doesn't assembles back. Disks stays in "spare" mode. Even ...
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Mdadm syncs disks on reboot and performance drops
I have a server debian 11 with 3 disks in raid, it happens that I have to restart it to do an update or other maintenance, when I restart it after days or months it synchronizes the disks and becomes ...
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MDADM Nvme raid Slower than traditional HDD, need enlightenment
I have setup server about 20 days ago with new nvme, before setup raid mdadm the two Nvme samsung 980 pro 1TB i test bench have IO speed average 1.5G/s each nvme, but after creating raid 1, IO nvme ...
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mdadm RAID10 disks layout
I've been trying to understand how disks are distributed in a mdadm RAID10, but i'm not completly sure. AFAIK, a native RAID10 is similar to RAID0+RAID1, i.e. data splitted in two chunks, each one ...
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LVM "not starting" after upgrading physical disks in underlying RAID6 mdadm array
Before:
separate SSD boot drive
RAID6 4 x 2TB -> /dev/md0
LVM PV /dev/md0
LVM VG built on the PV above
LVM 2 data partitions formed in the VG
mounted at /home and /mnt/data
I upgraded from ...
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How to convert mdadm raid1 to single driver and keep the data?
I have a raid1 created by mdadm in the root partition on /dev/nvme1n1p2 and /dev/nvme0n1p2, efi boot partition is on /dev/nvme1n1p1. Then I followed some commands to remove one of the disks and ...
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Added wrong drive to raid1 via mdadm, partition recovery
My raid is functioning fine, but I accidentally added a USB drive to what is a sata RAID1 with mdadm.
I noticed this pretty quickly and removed the drive from raid, it was synced about half a percent. ...
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mdadm using double disk space
My mdadm raid1 2 disks array seems to work good.
It is a 2 500GB array, shared over samba as proxmox bkup disk serving 2 nodes.
By the way, even if the size of the sum of the files is actually about ...
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DegradedArray event after removing raid with mdadm
My new server (ubuntu22) from hetzner has 2 ssds and and an additional big hdd that is intended to be used for back-ups only. Initially 3 raids were preinstalled, and the biggest part of an hdd was ...
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raid 0 made of drives of unequal sizes with mdadm
I want to create a raid0 array with mdadm from 3 physical drives: 8TB and 8TB and 16TB.
Is it okay to create 2 8TB partitions on the 16TB drive and simply create the raid0 array from 4 8TB partitions ...
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Creating a RAID 1 via mdadm ends with completely filled one of drives after sync
I have a server with 2x 1TB NVMe drives and I want them to work in software RAID 1 (mdadm) as a system drive.
After creating and waiting for sync of the array I'm ending with one of the drives in ...
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Added drives to raid array, and changed it from 5 to 6 but it looks like I forgot to add a filesystem to them
mdadm --detail output
Version : 1.2 Creation Time : Tue Jul 21 15:52:43 2020 Raid Level : raid6 Array Size : 29298912768 (27941.62 GiB 30002.09 GB) Used Dev Size : 9766304256 (9313.87 GiB 10000.70 GB)...
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Migrating on-premise server with RAID1 to EC2
I have an on-premise physical server running Debian 10 that I would like to migrate to AWS EC2. The server storage consists of two 1TB HDD drives on /dev/sda and /dev/sdb that have been set up as a ...
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How to solve a system freeze when mounting a mdadm raid-5 array?
I recently set up a raid-5 array with 4 disks on Ubuntu 22.04. When I try to mount the array using
sudo mount /dev/md0 /mnt/md0
the entire system freezes. I can see the desktop but the mouse doesn't ...
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System auto restart during the FIO stress test on a RAID0 array(6x SSDs) created by mdadm under Yocto OS
I met a problem when executing FIO stress test on a RAID0 which built from 6x SSDs thru mdadm under Yocto OS, below is the information:
6x PCIe NVMe SSD are the same vendor and model which is with 1....
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When adding a new disk to RAID 1, why does it sync unused space?
I recently set up RAID 1 on Linux with mdadm. When adding a new HDD to RAID 1, data started to sync between my drives which is expected. I didn't expect that it started syncing the entire drive, ...
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Why do md array rebuilds start?
I've recently made mdadm report about the events and yesterday I received a number of rebuild events. Why was the rebuild started? I don't see anything relevant in the journal. Also I'm concerned ...
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mdadm raid1 irregular degraded without reason
My raid1 went to degrade state from time to time. Then my application crashes, because the raid is in read-only mode. After a reboot the raid is working fine again. Now I want to find out whats the ...
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How to recover file system (ext4) on raid5?
I have an ext4 file system on a raid5 array, /dev/md0 built from mdadm.
I found it wasn't mounted after I reboot once. And I ran a fcsk on it but get a superblock error.
So I was going to run mke2fs -...
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Removing removed disk from Raid-1 in MDADM
I have a server where 2 disks were in Raid-1. Disk-1 went faulty and due to some reasons I had to take reboot of the server and below is the current status after that. Now, I am unable to remove the ...
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