Questions tagged [raid5]
The raid5 tag has no usage guidance.
117
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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,...
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1
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31
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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 ...
- 111
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0
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25
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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 /...
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1
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294
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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&...
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154
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Why isn't it possible to convert an existing striped / raidz zfs pool to one with increased parity by adding one or more disks?
Just to be clear, I am talking about taking an existing striped (i.e. RAID0) zfs pool and converting it to raidz1 (RAID5) or raidz2 (RAID6) after adding one or two new devices respectively and ...
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89
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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,...
- 11
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30
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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....
- 101
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1
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2k
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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 /...
- 23
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148
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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 ...
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79
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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 ...
- 508
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39
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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 ...
- 11
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160
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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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3
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459
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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 ...
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1
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307
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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] [...
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1
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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 ...
- 274
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37
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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. ...
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3
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894
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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 ...
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1
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58
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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.
...
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643
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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] ...
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496
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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 ...
- 103
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159
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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 ...
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108
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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 ...
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46
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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 ...
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1
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2k
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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 ...
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157
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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 ...
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515
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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 ...
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353
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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 ...
- 101
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2
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65
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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 ...
- 165
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1
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571
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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 ...
- 101
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55
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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 (...
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288
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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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1
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2k
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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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2
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2k
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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 ...
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289
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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 ...
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2
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18k
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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 ...
- 153
2
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1
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648
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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 ...
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106
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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 ...
- 583
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422
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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 ...
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249
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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....
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3
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1
answer
185
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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 ...
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1
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526
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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-...
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199
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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 ...
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1
answer
2k
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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 ...
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2
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111
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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 ...
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1
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87
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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 ...
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0
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766
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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 ...
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1
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1k
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Recovering a Failed Software Raid5
I'm looking to recover data from 4 old HDDs set up in a software raid5 and it looks like a disk has failed. What I want to do is recover the raid so I can copy its data somewhere else. I have done ...
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3
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Add linux md raid write journal to and existing array
I have a raid5 array with quite large disks, so reconstruction is really slow in case of a power outage. Thankfully, there is the --write-journal option for linux md raid. The man page lists the --...
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Build RAID 5 with mdadm and 1 disk with data
I have 3 exactly the same drives (4tb ironwolf) where i would like to make a raid-5 with using MDADM for a small degree of data security.
Now the problem is, 1 drive is filled with data which i am ...
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2
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624
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Why isn't the space of Raid 5 array equal to sum of disks?
I'm trying to create raid 5 from four disks:
Disk /dev/sdc: 8001.6 GB, 8001563222016 bytes
/dev/sdc1 2048 4294967294 2147482623+ fd Linux raid autodetect
Disk /dev/sdb: 8001.6 GB, ...
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