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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
  • 53
2 votes
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Edit: Both /dev/sdd and /dev/sde are missing super blocks. I assume this cannot be fixed. I am whipping the drives and starting over. I just finished coping 8TB worth of data to a new raid5 array. I ...
Scott Mayo's user avatar
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1 answer
88 views

I have created software raid5 using mdadm in Debian Linux. Now I want to switch to OpenBSD and interested if I will be able to mount my raid5 under new system?
gio's user avatar
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1 answer
105 views

Just adding a bit of storage capacity on my Openmediavault storage server went wrong. What should I do to recover? Can you lead me? This is what I did: 1 /dev/md2 raid5 set created, went well 2 /dev/...
Chris's user avatar
  • 37
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2 answers
73 views

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....
ikbenben's user avatar
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Synopsis Healthy Raid-5 array had 1 drive removed, quickly reinserted and started rebuilding. Then a second drive was removed within 10 minutes. Original drive assignments (sda, sdb etc) have changed ...
MikeD's user avatar
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2 votes
1 answer
64 views

I am not the first one with a stuck mdadm --grow but I think that mine is a bit different from the others. In my case all devices are faulty and the state says FAILED: root@linux:~# mdadm --detail /...
Marco's user avatar
  • 911
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1 answer
162 views

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
  • 111
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350 views

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
  • 359
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1 answer
376 views

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
715 views

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
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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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1 answer
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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
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2 answers
2k views

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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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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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
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2 answers
7k views

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
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0 answers
271 views

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
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1 answer
161 views

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
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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
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2 votes
0 answers
375 views

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
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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
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2 votes
1 answer
725 views

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
3k views

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
  • 324
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0 answers
56 views

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

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
  • 31
1 vote
1 answer
81 views

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
940 views

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
  • 3,956
1 vote
1 answer
1k views

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
  • 113
1 vote
0 answers
213 views

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
  • 11
0 votes
0 answers
186 views

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
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0 answers
84 views

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
  • 686
1 vote
1 answer
5k views

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
213 views

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
  • 11
5 votes
0 answers
665 views

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
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0 votes
0 answers
390 views

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
356 views

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
  • 245
0 votes
1 answer
865 views

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
89 views

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
  • 1,097
3 votes
1 answer
580 views

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
3k views

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
3k views

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
  • 33
0 votes
0 answers
377 views

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
  • 51
0 votes
2 answers
20k views

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
  • 173
3 votes
1 answer
1k views

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
  • 31
0 votes
0 answers
196 views

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
  • 603
1 vote
1 answer
539 views

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
  • 43
2 votes
0 answers
356 views

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
259 views

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
  • 43
0 votes
1 answer
815 views

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
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