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mdadm RAID5 array became "active, FAILED" and now no longer mounts

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
1 vote
1 answer
91 views

Does RAID always read/write an entire chunk?

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
4 votes
1 answer
175 views

RAID5 - Mark a disk faulty during reshape

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
  • 43
0 votes
3 answers
101 views

How to extend LVM RAID5

This is the first time I'm posting here; usually, I always find someone who has had the same problem as me. But I'm facing an issue with my RAID5 setup using LVM and could really use some help. ...
Tonnulus's user avatar
0 votes
1 answer
17 views

raid 5 mdadm replace with read errors

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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0 answers
25 views

mdraid in weird state after failed rebuild

So my NAS (mdraid level5) mainboard died and I built a new system - there I reassembled the raid and the rebuild started: md0 : active raid5 sde4[3] sdc4[0] sdd4[2] sdb4[4] 8634123072 blocks level 5,...
Funky Luke's user avatar
1 vote
1 answer
69 views

Trouble Mounting RAID

I have a RAID array that I cannot seem to mount after a power failure. The mount error says it cannot find the UUID even though it is to UUID reported by mdadm. mdadm --examine --scan ARRAY /dev/md/0 ...
Wt Riker's user avatar
  • 111
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0 answers
51 views

replace an SSD disk in RAID5 with bigger one

Some years ago I created a RAID5 array with mdadm. It consists of 3 1TB SSD (Samsung SSD 860). Here is how I created it: mdadm -E /dev/sd[a-c] fdisk /dev/sda fdisk /dev/sdb fdisk /dev/sdc mdadm -C /...
Marco's user avatar
  • 893
-1 votes
1 answer
965 views

What is the difference between BTRFS RAID1 and BTRFS RAID5 on 3+ devices?

According to "Examining btrfs, Linux’s perpetually half-finished filesystem", BTRFS RAID1 is said to be "guaranteed redundancy—copies of all blocks will be saved on two separate devices&...
Evan Carroll's user avatar
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1 vote
0 answers
133 views

LVM on RAID 5: LV does not mount at boot, need fsck

I am using Debian 11. I have a mdadm RAID 5 array of 5 disks (4 active, 1 spare) used as a PV for a VG in which 2 LVs have been created : one for home, one for backup. The home LV mounts at every boot,...
Vartaghan's user avatar
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0 answers
31 views

Missing usable space on RAID5

I have 3 drives, 4TB each, in a RAID5 setup. Usable space is 7.24 TB, all good & checks out. I use 5.5Tb and it reports 600Gb left. Maths does not checkout. I get an external drive and I move 5....
wabbit42's user avatar
  • 101
2 votes
1 answer
4k views

How do I make a spare device active in a degraded mdadm RAID5

A bit of history to start with. I had a 4 disk RAID5 and one disk failed. I removed it from the array and had it in a degraded state for a while: mdadm --manage /dev/md127 --fail /dev/sde1 --remove /...
NickH's user avatar
  • 23
2 votes
0 answers
210 views

Failed RAID 5 reshape after a sudden reboot

I was running a RAID 5 reshape process (growth from 4 to 5 drives) and at night a cooling fan failed and the server suddenly rebooted itself due to CPU overheat and one drive is now possibly out of ...
AMMX's user avatar
  • 21
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1 answer
100 views

Does adding 1 drive to an mdadm RAID5 with SSDs require writing all disks once?

I’m going to build a new storage with a few SSDs in RAID5 under Linux’ mdadm. I am considering buying 5 or 6 SSDs now. If I add another SSD in the future does adding it to the RAID5 require a full ...
Daniel Böhmer's user avatar
1 vote
0 answers
42 views

mdadm raid5 error during reshape

I first had a working 3 drive array (3 x 6TB drives) and added a 4th. It added as a spare so i ran the grow command. During this the machine rebooted and it did not recognize the 4th drive when it ...
who's.asking's user avatar
1 vote
0 answers
228 views

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 ...
MrCalvin's user avatar
  • 699
0 votes
3 answers
655 views

Cannot mount RAID 5 array on server, "Unable to read superblock"

I am an novice to servers and RAID arrays, but I am trying to restore a raid 5 array that has recently started to have problems with mounting onto our server. Full disclosure, I was not the one who ...
Schmidt's user avatar
2 votes
1 answer
545 views

How do I recover a broken software RAID5 array (mdadm)?

I had a working RAID5 array until I installed kvm and qemu and rebooted. After that the system wouldnt boot as /dev/md0 could not be mounted. Running cat /proc/mdstat gives: Personalities : [linear] [...
ElgerG's user avatar
  • 31
2 votes
1 answer
2k views

BTRFS and mdadm raid6

I have been a mdadm raid6 user for years and I'm very satisfied with it, but I would like to have a filesystem with snapshots, because fake snapshots on ext4 is eating all my diskspace. I read here ...
Camion's user avatar
  • 294
0 votes
0 answers
40 views

One of two disk members of RAID-5 became invisible after an abrupt shutdown?

I have two disks (sda and sdc, I don't know the fate of the others if any) assembled as RAID-5. After several abrupt shutdowns, one of the raid members became invisible and I couldn't re-assemble it. ...
ibilgen's user avatar
  • 153
2 votes
3 answers
1k views

LVM, LUKS2 & BTRFS Problem

I had the following setup: 3 HDDs 10Tb of size, in LVM Raid5 configuration On top a LUKS2 encryption and inside a BTRFS filesystem. Since my storage got low i added another 16TB HDD (was cheaper than ...
Gallifrey's user avatar
1 vote
1 answer
63 views

Moving RAID5 to RAID1 -- Out of Disk Slots [duplicate]

Years and years ago, I set up a 4 TB RAID5 array using 3x 2 TB disks. Those are positioned in sda/b/c. I have a very old tiny disk in sdd, and I'm booting from a 1 TB SSD in sde. Yea, it's a mess. ...
Mike H's user avatar
  • 11
5 votes
1 answer
758 views

Can a RAID5 disk be moved to a different slot?

I have a healthy RAID5 array with 5 disks: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sdb1[6] sdd1[0] sdh1[5] sdf1[2] ...
mivk's user avatar
  • 3,706
0 votes
1 answer
747 views

What is a good way to know mdadm RAID 5 array used size

I run a mdadm RAID 5 array of 4 3TB disks on Ubuntu 18.04, with a total size of 9TB. It displays as a 9.0 TB RAID-5 Array in gnome disk utilities, and the usage is 799 GB free, which means I have over ...
Harper's user avatar
  • 103
1 vote
0 answers
181 views

Rover a ReadyNas Array with mdadm

I ran a ReadyNas with 4 drives and raid5. One drive failed, I replaced it and it started rebuilding. The very moment the recovery was completed another drive failed and the NAS stopped working. I ...
Alexander's user avatar
0 votes
0 answers
132 views

HDDs are scratching at IDLE state on mdadm RAID 5

I have a mdadm RAID 5 on 6 hard drives. Every one second, I ear the same noisy pattern on hard drives, like when you read/write something on it, but without any operations... The raid is clean and no ...
Adrien Tanaka's user avatar
0 votes
0 answers
55 views

RAID5 array is rebuilding after a fresh install of Ubuntu 20.04 Server

I installed Ubuntu 20.04 Server on a system with three Seagate 6TB drives. I have partitioned both sda and sdb in two partitions. The first partition on each disk is of 5G. I combined those two 5G ...
sherlock's user avatar
  • 646
1 vote
1 answer
3k views

mdadm not enough devices to start the array - recovery possible?

MD raid5 array appears to have stopped working suddenly. Symptoms are somewhat similar to this issue in that I'm getting errors talking about not enough devices to start the array, however in my case ...
Blair's user avatar
  • 45
1 vote
0 answers
172 views

Problem with the mdadm Raid 5 array on Linux

I have a big problem here: Until a week ago everything worked perfectly with my mdadm array. I then let it shut down for a week and only now started it up again. Shortly afterwards, I noticed a first ...
Elytronn's user avatar
5 votes
0 answers
568 views

How to fix a bad checksum error on mdadm raid5 array (Ubuntu)

I have a 4 x 4 TB drive configured in a raid5 array. Drives labeled as /dev/sdb1, /dev/sdc1, /dev/sdd1 & /dev/sde1 assembled as /dev/md0 mdadm assemble output When I tried to assemble the array I ...
Ivo's user avatar
  • 51
0 votes
0 answers
365 views

Single RAID5 disk recovery Ubuntu 20.04

I have a Ubuntu 20.04 server, happily running 2 RAID1 arrays. I have a load of old disks that I want to check before deciding whether to backup before destroying. I am connecting the disk to the ...
TenG's user avatar
  • 101
2 votes
2 answers
96 views

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 ...
whitebear's user avatar
  • 175
0 votes
1 answer
650 views

Raid5 mdadm array change size

I have created a raid5 array with 4 disks. Initially i had 3x 3tb and 1x 4tb (because 3tb was unavailable at the time). After some years i have replaced most of these disks and have come to the point ...
jack's user avatar
  • 101
1 vote
1 answer
64 views

Quickly assemble raid5 for perf test

I'd like to run a series of fio-based performance tests on a few drives in various RAID and non-RAID configurations. When assembling drives in RAID5, the rebuild process takes an incredibly long time (...
Huckle's user avatar
  • 1,025
3 votes
1 answer
362 views

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 ...
david's user avatar
  • 131
2 votes
1 answer
2k 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 ...
Electr0's user avatar
  • 21
3 votes
2 answers
2k views

mdcheck_start Service Fails to Start

I've got a brand new Ubuntu 20.04 machine built out which is using a mdadm RAID5 configuration (3x 10TB). The system is throwing an error every time I log in. I can see from systemctl that the ...
Game Poop's user avatar
0 votes
0 answers
325 views

Is it possible to shrink raid5 software array in a safe way?

Is it possible to shrink ext4 filesystem and the underlying raid5 array in a safe way? I would like to shrink my 15 TB / 6 drive raid array that contains an ext4 filesystem. Before I do that on live ...
Adam Golebiowski's user avatar
0 votes
2 answers
19k views

fsck: error 2 (No such file or directory) while executing fsck.ext4 for /dev/md0

I have a raid5 which is inaccessible after unexpeted power outage. Details: # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10] md0 : active ...
Michał Walenciak's user avatar
2 votes
1 answer
868 views

How to track the start and end time of a raid5 rebuild?

This is my first post on the forum, so bear with me. I am new to the linux environment and also new to raid configurations. I am doing a work project where for part of this project I am measuring ...
Dennisw95's user avatar
0 votes
0 answers
131 views

Unable to resize filesystem on a raid 5 array "Unable to satisfy all constraints on the partition"

Until recently, I was using my raid 5 array with 4 disks but I added two more disks to the array and used the --grow option to actually grow my array. Now I have an array with a 2.7 TiB filesystem and ...
Weylyn Savan's user avatar
1 vote
1 answer
470 views

Grow LVM RAID5 by identical disk, not enough extents

I have an existing LVM RAID5 array on a CentOS 8 box made up of 3x4TB drives. That array is beginning to run low on space, so I have an identical 4TB drive I'd like to add into the array to increase ...
Kara Perrin's user avatar
2 votes
0 answers
270 views

Mdadm Raid6 Re(assemble|build|create) from 6x disk images of original array

I have 6 1TB drives from several years ago. There was a problem with the Seagate drives's microcode, so I updated it. Unfortunately, this reset the UUID of two drives and the RAID6 array was broken....
JohnT's user avatar
  • 21
3 votes
1 answer
225 views

Migrate Single Disk to RAID [duplicate]

I have a home server running Centos 7 that I'm using to host various different servers - a webserver, two Minecraft servers, and a PLEX server. Currently I have a 4TB HDD which serves as the primary ...
Kara Perrin's user avatar
0 votes
1 answer
644 views

Can't create filesystem on a freshly made raid5 using mdadm

I connected a 4-bay enclosure with 4 new 8TB disks to my rPi. This disks appeared in lsblk as sda to sdd. Following this tutorial I created the array doing mdadm -C /dev/md0 --level=raid5 --raid-...
Zegpi's user avatar
  • 103
0 votes
0 answers
216 views

mdadm RAID5 to RAID6 migration thrown exceptions, access to data lost

After a dozen of hours waiting for my array reshape to move on I think it's finally the right time to ask you for some advice. Recently I bought 4th WD Red 4TB drive to migrate my 3-disk RAID5 setup ...
Krzysztof Jakóbczyk's user avatar
2 votes
1 answer
2k views

How to check mdadm RAID5 integrity after power failure/random reboot

So I'm currently building an mdadm RAID5 array attached to my home server. The hardware is an Odroid N2 SBC with a Mediasonic Probox 4 bay enclosure attached. The array is currently rebuilding and ...
Nick's user avatar
  • 23
1 vote
2 answers
120 views

Can I Increase raid 1 capacity by changing to raid 5?

My initial raid setup was 2x2TB RAID 1 using mdadm. I have bought a 3rd 2TB drive in the hopes to upgrade the RAID's total capacity to 4 TB using mdadm. I have already run the following two ...
cloudcalvin's user avatar
0 votes
1 answer
109 views

RAID 5 crash... trying to save what I can [closed]

I have a QNAP server with 8 disks. I have 2 backup/extra disks that are not in use. (I had the money an knew eventually the running ones would need replaced) The full array was across the 8 disks @6TB ...
Shadowed6's user avatar
3 votes
0 answers
782 views

How to recover data from synology Raid 5?

My old synology server (cs407s), died. So I'm trying to retrieve the data from the disk. I have tree disks from RAID 5. I tried to mount the disk on computer running grml. # lsblk sda 8:0 0 ...
thumes's user avatar
  • 31