Questions tagged [software-raid]

Questions which refer to software RAID implementations.

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21 views

How can I remove RAID 1 on Ubuntu 18.04 server to reclaim storage space?

I have a server with RAID 1 set up, I want more storage by removing RAID 1, but I don't know enough to do this. Please provide commands that will allow me to delete the raid and get 2 disks separately....
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mdadm raid gone after reboot due to super blocks disappearing on all but one drive

I have a raid 6 on /dev/md0 using /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf. I moved this raid to a different motherboard but kept the same non-raid card, and all drives including the OS ...
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mdadm: RAID gone after reboot, partitions gone, service masked

Some weeks ago I set up a software RAID 1 with mdadm, consisting of two 2TB WD Red HDDs, as a backup medium (Debian Stable). Everything works, I hooked up everything for it to come up after a reboot, ...
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Raid0 Not Working

I cannot start my RAID0 after a Raspberry Pi reboot. Before the reboot it worked fine. $ mdadm --create /dev/md0 --level=0 --raid-devices=3 /dev/sda1 /dev/sde1 /dev/sdf1: mdadm: RUN_ARRAY failed: ...
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23 views

¿Does a RAID array persist through multiple OS installations?

As title said; i'd like to know if a Windows-made software RAID array will persist a new installation, if I could read that RAID with another Windows partition or installation and if other OS could ...
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RAID 1 enabled via Disk Management after setup. Is this a valid RAID 1 mirror of Disk0?

I converted Disk 0 to a Dynamic disk, which was needed before kicking off a RAID 1 Mirror on Disk0 -> Disk1. However, I noticed when I kick this mirror off, it's not the entire drive, but it's just ...
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9 views

Setting up raid/symlink over rclone mounts

i use rclone to mount my google drives witch is great but im wondering in linux is there a way to use the 2 or 3 mounted drives to be seen as one my thought is folder /usr/home/backup will open and ...
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183 views

Checking/fixing RAID 5 Directories

I'm running a RAID 5 array with 10 disks on ubuntu 18.04 LTS.I recently had a drive fail due to a faulty cable. After fixing that I ran into another issue where another drive showed as faulty, but it ...
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32 views

MDADM raid6 huge mismatch_cnt

I have a problem with mismatch_cnt being huge (over 100000000 and more) on a raid6. /dev/md0: Version : 1.2 Creation Time : Sat Jul 27 22:30:18 2019 Raid Level : raid6 ...
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30 views

Is bad memory an issue for Windows Server Software Raid 5 resync?

So, I have a setup at home where I run a Windows server 2019 running a Software Raid 5 setup running over 5 disks created through disk manager. Since this is a home system, I haven't really found ...
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Replace a Raid 0 Disk (Software Raid/Windows)

I would like to know if it is possible, to replace a Disk in a Windows Software Raid 0. (e.g. clone the disk to another one inside the OS) I have seen another post where this question was asked, but ...
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Is it possible to clone a single disk from a Windows striped array (“RAID-0”)?

I know it's different for 'actual' RAID arrays, but I was wondering if maybe Windows striping / software RAID may be different, since all the striping happens within Windows and not a dedicated ...
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Moving from mirrored dynamic disk to RAID1 storage space

During setup of my gaming PC I created a mirror dynamic disk on the 2 data disks because The Internet suggested it. Now I know this was a bad idea since it de-synchs more often than it should even if ...
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Drive drops out of mdadm software RAID1 after reboot

I have installed two drives in my Ubuntu 18.04 LTS server: 2 x 6 TB HDD WD Purple, assigned to /dev/sda and /dev/sdb. I want to mirror them on a software level and create a RAID1 that is persistent. ...
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Is Intel ESRT2 Software-RAID?

I have 2 options for configuring RAID at the UEFI level. Intel ESRT 2 and Intel VROC which is the successor to Intel RST (rapid start). I know Intel RST and thus VROC (which is present on non server ...
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53 views

How to completely scrub an raid disk?

I have started working on raid devices related project. And I would like to be able to test my changes easily. The problem is whenever I need to create or remove a new raid device, I have to go ...
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43 views

Recreate hardware RAID 1 out of fully-mirrored disks without data loss in software RAID 1

I have two identical hard disk drives with identical data. They were a former hardware RAID 1 on a MSI H97M-E35 mainboard with an Intel H81 Express chipset and were used as data drives (not as system ...
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mdadm - Raid 1 arrays do not assemble after reboot

I rebooted my server after creating 3 raid 1 arrays with mdadm, and after rebooting, systemd was spitting out errors about the raid devices timing out when trying to assemble them at boot. I was given ...
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59 views

Machine crashes with AHCI controller unavailable! and not using Asmedia Controller

I have an Machine that crashes periodically. When I recreated the issue I found that the machine fails with the error AHCI controller unavailable! (full errors in the screenshot). I have an AMD Ryzen ...
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linux raid5 with 7 disks have readerror without readerror of one of the drives

i have a mysterious problem: i install a raid5 array with 7 1,5 TB disks in one of my server for some years under kernel 2.6.x with metadata 0.9 and have no problems. in the last weeks, i update this ...
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Is it possible to collapse RAID 1+0 to RAID 10 (single layer) with mdadm?

I've created two RAID 1 arrays and combined them with a RAID 0, and I recently read that mdadm also supports a one-layer-solution for that, is it possible to convert my setup into the one-layer-setup ...
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RAID storage structure

I want to clarify with my understanding related to the RAID storage structure. I hope someone can guide me on this topic. First, let me show a picture of RAID system. [RAID][1][1]: https://i.stack....
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how to correct csum errors in BTRFS RAID

I'm running a BTRFS RAID on 4 disks, using RAID5 for data and RAID1 for metadata: > btrfs filesystem show /mnt/storage/ Label: 'Storage' uuid: [...] Total devices 4 FS bytes used 1.61TiB ...
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Centos7 RAID5 dual disk failure recovery attempt - suggestions to get going?

My home fileserver is a CentOS7 with 5 3TB drives configured as a 4-disk software RAID5 plus one hotspare. LVM on top of the RAID with 4 logical volumes. Maybe 30%-40% capacity is used among the ...
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198 views

RAID Chunks (Centos)

I would like to understand more about RAID chunks. System Info: Centos 8 with 6x 10TB(WD100EFAX) in RAID6. What is the difference between the two chunk readings from mdadm, 512k chunk and then the ...
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61 views

Linux Software RAID broke after power outage

My server lost power this morning. The server is running Linux Mint (14?) on a battery backup and I believe it shutdown before losing power. Upon restarting the server the computer hung for a while, ...
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How do I start my MDADM RAID5 array that's in the following state: active, FAILED, Not Started?

I have a home server and due to a blackout last night, now I'm unable start the array. How can I start the array without losing data? Here is every info I could gather: mdadm --detail /dev/md69 mdadm -...
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103 views

What would happen if a RAID 1 contained 2 different file versions?

Let's say a hardware RAID 1 controller with disks A and B was taken offline, and a file present on both disks was altered on disk B (all within an offline state). When the RAID controller is turned ...
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113 views

What does delta devices of the mdadm--detail output mean?

Here is an output of mdadm --detail: $ mdadm -D /dev/md2 /dev/md2: Version : 1.2 Creation Time : Wed Jun 24 16:41:17 2020 Raid Level : raid5 Array Size : 7809195456 (7447.43 GiB ...
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84 views

Disable warning from mdadm for “degraded” RAID1 with missing drive

I recently had a server outage due to a failed drive. Because of that I set up the server with a new SSD in RAID1 this time but until I managed to get another SSD drive the mdadm-based RAID1 runs with ...
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Native IO performance of 1 pagefile per physical drive in off-the shelf configuration vs software or hardware RAID

Windows 10 allows to assign pagefile sizes for individual logical drives. In my case, both the main boot SSD and an extra SSD have their entire size dedicated to a single logical drive each. Now I've ...
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221 views

RAID 5 with SSDs; how many and what class of SSDs to use?

I have a 850 EVO 250gb as win/programs/games disk and I am thinking buying more SSDs to go with RAID 5 in order to gain more speed. I know the pros and cons of RAID 5. The question is: 5 cheap 120gb ...
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213 views

Windows 10 - RAID5 - Intel RAID or Storage Spaces?

Which method should I use to RAID5 my 3 drives? At the moment I started out with Intel's RAID but it seems super slow. Steam can barely download with 10M/s speeds and the array sometimes have ...
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389 views

Restore linux partition table of one raid0 drive after accidentally installing windows over it

How the problem arrose: So I made a very stupid mistake yesterday. I installed windows 10 on the wrong harddrive (I didn't expect the installation to start right after choosing the drive). After ...
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94 views

Long-term local offline RAID storage of never-changing data

I have about 20TB of data that will remain unchanged (forever) and I am planning to make offline copies with a little redundancy. I already have a lot of 2TB drives that I plan on using and I am ...
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490 views

Unable to re-assemble RAID1 using mdadm — failed to run array, invalid argument

I'm trying to assemble a RAID1 array using mdadm. I'd like to be able to debug this error, but I'm not sure where the error actually is, other than "Invalid Argument". Here's the main log. I can't ...
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mdadm.conf: mdadm -E --scan *vs* mdadm -D --scan, which is correct to use?

I have two questions: It's not clear which flag to use when generating mdadm.conf. I've seen people and documentation use mdadm -E --scan I've also seen mdadm -D --scan. Which is correct to use? ...
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42 views

Building a RAID5 out of multiple drives

I have 2x 12TB drives and then these three additional drives: 2TB, 3TB, 3TB I want to create a RAID5 with as much capacity as I can. So, I was wondering if it'd be possible to use the three small ...
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182 views

What are the options for simple file or data redundancy on a custom NAS?

I'm asking this for the sake of clarity as I'm in the process of building a home NAS and going crazy trying to decide how to set it up. What options are there for no hassle file/data rendundancy to ...
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346 views

Drawbacks of small ZFS pools versus large

We are redesigning out current ZFS file server. It currently only has one pool of over 70TB. I see this is a problem since, if there are enough disk failures within the pool to make it non-...
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41 views

Is linux software raid recoverable if independent OS drive fails?

From my understanding RAID controllers are responsible for managing reads / writes to and from RAID arrays since data for certain configurations (5 and 10 come to mind) can be sharded across multiple ...
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183 views

Adding a new hard drive to RAID1 software RAID fails

I've got a Mac Pro 1.1 running macOS Server 10.6.8 that I want to use as a RAID-Server. I use Disk Utility to run a RAID1 set with two 500GB hard drives. Now adding a third 500GB hard drive to the ...
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567 views

df is not listing one RAID device (RAID1) on Ubuntu 18.04. fdisk -l lists both

I had installed two RAID1 drives on Ubuntu 18.04 and had verified that if any one drive is taken out, the system booted and then after the second drive was added, it resynced. That was some months ...
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915 views

How to safely configure/use SW RAID 5 with Raspberry PI 4b / DietPi without data loss?

This question is also to clarify if I have a decent bug here, software or hardware. My aim is to set up a SW-RAID-5 to my Raspberry PI 4b system using a USB3.0 HUB with 3 4 TB Western Digital hard ...
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Why Raid 1 don't improve read performance like Raid 0?

It should be able to read the data across the 2 disks like with Raid 0 right? but when I look at benchmark it looks like only one drive is used to read the data. https://raid.wiki.kernel.org/index....
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656 views

mdadm UUID lost after reboot

Here is the problem. I part all disks into 4 partitions. Use all disk partition one to create raid1(md0). However, after reboot some of the raid members lost, the raid is degraded. Use blkid to check ...
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1k views

Synology DiskStation: How to stop/interrupt a running reshape (RAID5 -> RAID6)

The short of it: I have a running reshape from RAID5 with 5 disks to RAID6 with 6 disks which needs to be stopped, so I can power off the system. I do not care if the reshape needs to start fresh once ...
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120 views

Can a mdadm software RAID 1 drive be accessed independent of the other drive in the array?

I'm doing research for a project I'm starting, so I cannot provide configuration here. Say I have a software RAID 1 array configured between two drives with mdadm. If I write data to the array and ...
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246 views

Dualboot Windows 10 and Linux on software RAID with common devices

I'm interested in improving the reliability and availability of the operating systems on my workstation as part of an upgrade being planned soon to my hardware. I tried to find a question like this on ...
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mdadm RAID 6 drive failed over, then some of my data disappeared

Background For 7 years now I've had a personal file/media server running Fedora (initially 21, currently 30). The main storage array comprises 3TB drives in an mdadm RAID6 (originally, RAID5). Over ...

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