Questions tagged [software-raid]

Questions which refer to software RAID implementations.

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11 views

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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54 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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24 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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114 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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42 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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31 views

Migrate from Intel RST to RAID Controller without data loss

For some years now I have used the Intel RST to create a RAID 5 for my drives connected to the mainboard. I now need to move these to a dedicated RAID controller because my Storage requirements are ...
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1answer
42 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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17 views

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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39 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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32 views

Starting RAID6 array with a disk that mdadm regards as spare

I have an 18 device Raid6 array where two disks has failed. I have now obtained replacement disks and I have installed them physically into the server and booted it up again. Now suddenly the array ...
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28 views

Serial number found with `smartctl` does not match serial number of disk's sticker

I have a failed disk in my RAID10 array. However, when I try to find the RAID disks serial numbers, I find that not all the disks serial numbers that I get from running the following, match the actual ...
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How to create RAID1 on working Slackware 14.2?

I use Slackware 14.2 (with kernel 4.4.14-smp) on sda and I'm trying to create the RAID 1 with additional sdb. I'm using the VM VirtualBox. First, I have cleaned the sdb: dd if=/dev/zero of=/dev/sdb ...
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69 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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1answer
81 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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37 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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79 views

Nested RAID with Intel Rapid Storage Controller or Software-RAID

I have a bunch of SSDs lying about and thought it would be a great idea to assemble a fake RAID using Intel Rapid Storage Controller. The SSDs come in two different sizes (250 GB and 500 GB). So I ...
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21 views

SSD not showing after RAID in windows

I have 2 Adata SU 650 Ultimate SSDs on a windows 8.1 pc. I tried to set a Mirror in Control Panel > Storage Spaces. After that, the second SSD is not visible any more. The SSD is present in BIOS and ...
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96 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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199 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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428 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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34 views

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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205 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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450 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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40 views

Getting a drive from RAID1 to non-RAID on a new build

It's a bit of a long story - I accidentally clicked "hibernate" instead of "restart" on my Solus Linux desktop. Apparently that was a bad idea because nothing I did would resume it. I ended up either ...
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29 views

Can you use bit striping on RAID 0

I have been looking into RAID 0 and the different types of striping. Although i could see RAID 3 and 4 can use bit and byte striping, I can only see block striping for RAID 0. I have looked about a ...
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55 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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166 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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52 views

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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44 views

Moved disks to new computer, RAID won't re-assemble

I bought a new computer with a NVME ssd.I moved all the old disks over, but I couldn't get it to boot the old disks, so I tried just installing kubuntu on to the new machine's NVME. After installing ...
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83 views

Does RAID 1 improve random read latency?

Specifically, in the cases of mdraid and Intel Rapid Storage. If so, is it done by "racing" the disks, or is only the "less busy" disk that's queried?
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52 views

Windows 7 software RAID 1 hard disk reactivation taking a very long time, how normal is it and what can I do?

I had an HDD start failing in my RAID 1 array recently (two 2 TB HDDs, no operating systems installed on the RAID). The failing drive had to be replaced, but during debugging of another issue (which ...
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34 views

RAID1 / CentOS - I can not remove a faulty disk and connect the good disk

This server (has RAID 1 - SoftRAID with CentOS) has been delayed by deleting a cache of 290,000 files last week, and yesterday when performing manual backup of the machine via tar.gz, it failed and ...
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98 views

mdadm can't reasamble raid 05

English is not my first language, so sorry in advance for any grammar errors. A partner configured a raid 5 of raids 0 with mdadm (I did not wanted to put the data on any thing that was not one of ...
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28 views

I added 5 drives to mdadm raid array, then I noticed 3 had partitions on them already. What is going to happen?

I have a 15 drive raid6 array using MDADM on ubuntu linux 18.04.2 server. I installed 5 more drives and added them to the raid array, and it started reshaping. However, after that I noticed that three ...
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249 views

btrfs ontop of mdadm raid - calculating stripes for corrupt sectors for use with raid6check

I've got a setup with btrfs running on top of mdadm raid6 as btrfs's RAID5/6 code isn't stable yet. I figured this way I'd get the benefits of snapshotting and checksumming with a few extra hoops to ...
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59 views

Linux RAID1 disk not booting in new PC - Gave up waiting for root device

I had a Debian linux PC with two hard disks using raid1. Used is as DHCP and firewall. The raid1 consisted of two partitions, md0 as swap, md1 for / . The motherboard in that PC stopped working, and ...
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2k views

Do I need to wait for 100% resync?

I have set up a mirrored partition in Windows 10. Today I noticed a lot of disk activity in task manager for no apparent reason. Looking up the disk management, I see that it is resynchng. In task ...
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413 views

mdadm shows inactive raid0 array instead of degraded raid6 after disk failure

I've been running an Ubuntu 18.04 system with an 8-disk raid 6 array, that crashed while having a faulty disk (I only noticed that there was a faulty disk after the crash). The raid array has survived ...
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250 views

mdadm re-added a removed disk to my RAID1 and skipped re-sycning it, what went wrong?

I ran into what is a true mystery to me today, and would love if someone could give me an idea of how what happened is even possible. We had physically removed a disk from our software RAID1 (Ubuntu ...
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1k views

RAID 5 Windows 10

Rev 1. - Provided Screenshot for Further Clarification. When I convert my storage drive from a basic to a dynamic disk in Windows 10, using diskpart.exe, there is one partition but no volume to go ...
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291 views

mdadm raid cretion: apparently superblock not written to disk

I am in exactly the same predicament as MDADM raid “lost” after reboot: I followed this giude to setup a raid-1 array with two disks (I was working in a recovery shell, so no "sudo"): mdadm --create ...
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213 views

how can I add SSD as RAID 1 cache?

I have 2x 3TB hard drive setup as software RAID 1. sometimes, it was painfully slow. How can I add an SSD as its cache? is it possible? Note : the RAID was where the debian linux inside booted from....
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662 views

raid 1 badly detected as raid 0 when one drive is missing

I'm learning raids, so maybe this is some basic question, but it's not covered anywhere... When I create raid 1, update /etc/mdadm/mdadm.conf as[1], run update-initramfs -u, I can reboot and mount it....
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213 views

File system corrupt after re-adding software RAID 1 member after test. Why?

A colleague and me set up a software RAID 1 with mdadm consisting of two physical disks, with two partitions on the virtual device. The set up went fine, and booting directly from one of the RAID ...
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298 views

Mdadm raid5 - Cannot assemble mbr metadata

I have a problem. I found similar threads all over the internet, but I thought it might be better if I ask one specific with this configuration. There is a ubuntu 18 machine with 5x 4tb. I think it is ...
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61 views

M.2 Drives not appearing after reset of Windows 10 machine

I recently, mistakenly uninstalled a driver which forced me to completely reset my machine. I have a Dell Precision Tower 5810 running Windows 10. I have a standard internal hard drive as the C: drive....
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159 views

Steps to swap failed disk in RAID 10?

I have a RAID 10 array consisting of 4 disks. One of them has failed and I have removed it from the array. I have purchased an identical new drive and am unsure about how to add the new drive to the ...
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1k views

Can't add unallocated 2nd drive to C:\ in either striped or spanned volume

I was playing with getting rid of my BIOS RAID 0 and using AHCI. This would destroy the RAID 0 meaning I'd have to create a software RAID with Windows. After converting to AHCI and doing a clean ...
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790 views

How to activate disk that was originally in Windows RAID 1

I took HDD from a computer that was running RAID 1. I have inserted that drive into another computer expecting it to be immediately recognized. It is not recognized, and Windows can't activate it. ...
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1k views

Failed GPU passthrough using Unraid 6.6.6

A while ago, I have build a new Ryzen setup. I am currently experimenting with Unraid 6.6.6 and trying to setup my daily Ubuntu VM with a passed through GTX 1060 from Inno3D. Unfortunately, I get ...

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