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 to properly see files on raid mount?

Operating System: PopOS (Ubuntu) I have two external harddrives in a single case that were setup with a RAID1 configuration. Had to get a new computer and after plugging in the external, the RAID ...
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LVM misalignment: lvcreate causes alignment inconsistency

When creating a logical volume using the following commands the kernel log tells me there is some misalignment going on: $ sudo vgcreate shinymarengo --dataalignment 1M /dev/sda /dev/sdb /dev/sdc ...
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Grub Rescue - LVM ID not found

I freshly installed system on my HW RAID 0 drives, over which is installed SW Raid 1 with LVM. After Installation of Debian 10, I've got this problem which I don't know how to resolve. I tried so far,...
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find why mdadm dropped a disk

I have had mdadm drop a disk twice in the last month or two. I re-added it last time and it ran fine for a while, then I noticed it was running in degraded mode again. I wondered how I find the "...
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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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fstab issue on mounted drives

I am running Ubuntu 18.04 and recently installed two new hard drives running a RAID 1 that I set up using mdadm. But when I shut down and unplug the computer, plug back in the power, then turn the ...
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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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Changing RAID to AHCI without reinstalling Windows 10

Following instructions given here by Quertie (on comments) I'm actually struggling with two possible solutions in my situation. I have managed to install Linux Mint on a: Dell XPS 13 (7390), x64, ...
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Linux raid suddenly not assembling when rebooting

I had a very simple RAID0 set up with just two disks, and it was assembling fine for a long time after rebooting. Then suddenly it is not loading anymore. mdadm.conf: DEVICE partitions ARRAY /dev/...
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mdadm: How to create RAID50 on Ubuntu 16.04

I am unable to create a RAID50 with mdadm on Ubuntu 16.04. Every time I reboot the server, the RAID0 will disappear. Here is how we proceeded to create the RAID50 : Create two RAID5 (8 disks each) : ...
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btrfs RAID0 - should I stripe or duplicate metadata?

I want to use btrfs with raid0 on three nvme drives. These should contain the operating system and most application files, whereas valuable user files will be on a network drive or seperate disk. ...
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Help me understand the recovered file system

So I had a Synology machine that went bottoms up (motherboard). I built a debian system myself and installed the hard disks today. After some twiddling with mdadm I was able to mount the both hard ...
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Dual Boot Windows 10 / Linux Mint 19.3 on Dell XPS 13 (7390)

As I'm new to dual boot Linux with Windows I'm probably missing a lot during this process and I'll be glad if someone can help me sort things out. I got a new Dell XPS 13 (7390). It came with Windows ...
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Is it normal that my LVM mirror log files (mlog_mimage_0/1) are both on the same hard drive?

I had to setup my root partition with the old LVM mirror capability (as shown below, it says "m" in the attributes). This was required so I can boot on that partition. The new RAID1 doesn't work at ...
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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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Can M.2 drives be configured as redundant in Linux

I have a workstation board with 2 M.2 slots of type 3, 2280. Can I configure linux (Arch) to use the drives redundantly, so if one fails, then the other will continue working?
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How to recover journal superblock on mdadm RAID5 array

Yesterday my raid5 array with 3 disks was suddenly unmounted. After examining it, it seemed it had become degraded and one of the disks had a much lower event count than the rest. I started running: ...
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megaraid_sas: Init cmd return status FAILED for SCSI host 0

I have an LSI MegaRAID 9440-8i RAID controller. This controller works fine in my PC, i.e. it is recognized by Linux and I can see the disk connected. When I put this controller into my server, it ...
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After creating RAID 1 can't connect to server

I have created RAID 1 array consisting of 2 devices(working on Ubuntu 18.04 LTS) : mdadm --create /dev/md6 -l 1 --raid-devices=2 /dev/sda9 /dev/sdb6 mkfs.ext4 /dev/md6 mkdir /raid mdadm –detail –...
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Undo “Add Parity”/RAID on ReadyNAS

I have a ReadyNas 102 with firmware v6.10.2, it has 2x 2TB drives I inadvertently selected "Add Parity", now its part of a raid group, when I want two drives And none of the Apps work! How can I undo ...
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linux stress, impose work on specific disks

Have a server running centos 7.6, and it has 4 ssd's as Raid-0 mounted as /scratch/ I have the linux program stress-1.0.4-16 and I just learned stress-ng existed. Is there a way with stress to tell ...
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Investigating a failed drive in a raid array

Is there any way to determine what may have happened in the following scenario? We have a RAID5 that should have been originally built with 5 drives. As it stands, this is some of the state that I'm ...
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Linux software RAID or SDD failure?

I rebuilt a machine recently, and decided it would be fun to do RAID on some SDDs. It has not been going well, and I'm having trouble figuring out what is going wrong. I have 2 8TB HDDs in RAID 1 ...
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Is it safe to reboot linux just after an lvextend?

I'm wondering how safe it is to reboot a Linux install just after I did an lvextend on a mirrored partition. I can see that the partition is being mirrored properly as the HDD light is light solid. ...
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How to format HDD which is using raid?

I have a laptop which raid has installed on it, and I have two devices sda & sdb for my storage unit and its raid, I want to completely format both the discs. I have come up with the following ...
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Boot Fail - Extend LVM (“root”, “/”) over RAID 1 (CentOS 7)

QUESTION: CentOS 7 does not boot after we extend a Volume Group (VG) over RAID 1 using another RAID 1. The process we use is demonstrated in PROCEDURE: Extend LVM ("root", "/") over RAID 1. What is ...
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mdadm create raid 5 stopped after ony few hours

I'm trying to setup a raid 5 for my Nextcloud but when I run the mdadm --create command it stops. Here is my configuration : Disk /dev/sda: 2.7 TiB, 3000592982016 bytes, 732566646 sectors Units: ...
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Shrink JBOD/linear Raid on synology

I had 2x6TB drive and a JBOD volume because the data isn't really critical and couldn't afford to lose half the space for a raid 1. Now (a couple years later) I bought 2x8TB new drives for my 4 -bay ...
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How to mount a RAID1 drive?

I have a 2TB drive from my two-bay Synology NAS that I want to access via Linux Mint. fdisk shows: root@HUB:/# fdisk -l Disk /dev/sda: 111.8 GiB, 120033041920 bytes, 234439535 sectors Units: ...
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Software recovery of 3ware RAID?

Is there any software or instructions out there on how to get data off of a 3ware RAID set (using RAID5) when the controller doesn't function? I have the controller still, but it won't work properly ...
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Confused about RAID 1 capacity

Is it true that a RAID 1 can only be as big as the smallest disk? If it is true, then ten 1GB disks in RAID 1 should only amount for only 1GB of total available space. Is it true that RAID 1 capacity ...
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Getting an error “appear to have very similar superblocks”. Ways to fix it?

So something strange is with my partitions. root@rescue ~ # mdadm -A --scan mdadm: WARNING /dev/sdb1 and /dev/sdb appear to have very similar superblocks. If they are really different, please --...
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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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367 views

systemd Time out waiting for device dev-mapper-vg

I've got a Debian Jessie system and I'm trying to recover this onto a RAID 1 with LVM. I've got a RAID1 over two 2TB NVMe drives and my /boot is on a USB booting in Legacy mode to Grub2. That bit ...
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Linux Mint doesn't recognize Disk

i have a lenovo ideapad s340 with win 10. When I install linux Mint the installer doesn't recognize the ssd. I found online that the problem is the sata Raid option . So i need to switch from Raid to ...
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Order of disks when using mkfs.btrfs with raid10

I need to create a raid10 array with btrfs. The raid will be handled by btrfs directly (not mdadm), since, I believe, it gives more information to the btrfs layer to detect and handle failures (am I ...
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Setting up RAID array in Centos 7 with non-empty and empty disk

Trying to create a RAID array implementation for Linux Centos 7 VM in Azure cloud. The VM already has two data disk out of which one acts as backup. I am trying to add another additional data disk ...
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How to recover RAID0 with MegaCli64? [closed]

I have a RAID0 drive consisted of two SSDs. I accidentally removed one SSD and insert it back immediately. How can I recover the data? I marked the reinserted disk as good and cleared the foriegn ...
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Soft Raid5 failed, bad sectors

I have a Soft Raid 5 managed with mdadm on a ubuntu 16.04.02. 3 disks WD Red 3TB, for data only (system is on ssd). sdb, sdc and sdd Last week, after reboot, the system did not startup, after a while ...
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Fix mdadm RAID1 inconsistencies using btrfs/zfs checksums

I prefer mdadm RAID1 vs btrfs RAID1 because: With btrfs, all read requests from the same PID go to the same device bcache coverage is doubled using a single mdadm RAID1 device vs btrfs with 2 ...
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RAID5 repair froze on NAS, trying to restore with mdadm now

I am running a Zyxxel NAS540 with 4x4TB Hard Drives. A few days ago the NAS started beeping and I saw that the RAID is in a degraded state. Since one of the drives had really bad SMART values, I shut ...
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Centos, add existing raid0 without lossing data

i had reinstalled centos 7 which has raid0 working fine previously. now my partition look like this: [root@ns31132644 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 223.6G ...
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RAID device won't mount in OpenWRT

I'm trying to get my RAID 1 device to work after I upgraded my router's OS (based on OpenWRT). The RAID device is listed as /dev/md0: # lsblk -o NAME,SIZE,MOUNTPOINT,STATE,FSTYPE,MODEL,SERIAL,UUID,...
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Add a disk to grow LVM Raid5

I have an LVM VG with a single LV that is a raid5 volume with three PVs. I would like to add an additional PV to the volume group and extend the raid5 LV to use it. Here I am using 4 100MB files as ...
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Recreating a RAID4 / RAID0 array

At first, there was a RAID0 array, to which I've added a new disk by issuing mdadm --add but when I've done that, the drive started to fail because of the power issues and the array has not started ...
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What should I expect to see if md/linux RAID is properly compensating for a failing drive?

Does the md subsystem output any messages (to syslog/systemd-journal) to indicate that it's running in a degraded state (or anything else that might indicate that it has successfully reacted to a ...
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My RAID 1 always renames itself to /dev/md127 after rebooting | DEBIAN 10

PROBLEM I create a RAID 1 configuration, I name it /dev/md1, but when I reboot, the name always changes to /dev/md127
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Error with Vagrant creating 2 HDDs and installing mdadm for the later configuration of a RAID1

WHAT I WANT TO DO Raid1 configuration on debian buster, with 2 HDDs of 1GB. Also, I want to automatically install mdadm so then I can access the machine and configure the RAID1. IMPORTANT The RAID1 ...
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Software RAID slows down while emptying buffer

I am experimenting with mdraid in CentOS 7.6, trying to understand these results from fio. I am doing a sequential write to a 4 stripe array, and the speed starts out good while it writes to the RAM ...
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mdadm software raid question

Hoping someone can help! Never used software raid before and I've noticed the 2 disk RAID 1 is showing as degraded [U_] : # cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda3[0] ...

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