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Questions tagged [software-raid]

Questions which refer to software RAID implementations.

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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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1answer
40 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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56 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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1answer
20 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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17 views

How to setup a raid 6 on ubuntu server 18.04 with 4 HD

i have to setup an ubuntu server (18.04) with 4 HD in Raid 6. I start installtion with usb stick but i don't know how to config partitions to enable raid 6. (ubuntu doen't let me enable raid 6 due to ...
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29 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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18 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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1answer
33 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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2answers
31 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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1answer
49 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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1answer
193 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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259 views

Storage spaces on Windows 10 and tiering

I have a number of disks on my Windows 10 (pro if it maters) desktop and have been toying with storage spaces. I'd like some advice on how to configure storage volumes for my use cases. I know the ...
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2answers
56 views

Programmatically check Linux RAID array (MD)

I would like to programmatically check if Linux RAID arrays are broken. For a RAID-1 (mirror) array, I am using this simple method which was worked for several years, with good results: cat /proc/...
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23 views

LUKS2 - RAID0 - NVME : alignment issue

I have trouble while in top of this stack bellow: mkfs.ext4 /dev/mapper/raid0luks2 /dev/mapper/raid0luks2 alignement is offset by 147456 bytes This may result in very poor performance (re-) ...
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1answer
388 views

How does Synology Hybrid RAID work?

I'm not looking for what Synology Hybrid RAID (SHR) allows the user to do, but rather, what is the concept that SHR uses to allow you combine disks of different sizes? In most RAID implementations ...
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1answer
87 views

Software RAID Nonfunctional after power outage

My server lost power yesterday. It automatically booted up when power came back, but my RAID is now nonfunctional. The RAID array is a software RAID6 built with mdadm. Originally, the array used 8 ...
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1answer
114 views

Share RAID between Linux and Windows 10

I have a PC with two SSD, one for Windows 10 and one for Linux. I also have two more 1TB disks that I want to use as a software RAID 1 volume shared between Windows and Linux OS. Which way could be ...
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1answer
35 views

what is the performance of zfs IO operations with unequal sized disks?

I have (ZOL) zfs pool (no mirror and raidz) named primaryPool # zfs list NAME USED AVAIL REFER MOUNTPOINT primaryPool 54.5G 41.9G 96K / primaryPool/ROOT ...
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1answer
86 views

Reading Intel Matrix Storage Manager (Intel fakeRAID) metadata on a non-Intel controller with mdadm

In a few months, I will be swapping out the motherboard of a system which has IMSM (Intel Matrix Storage Manager, or Intel's version of fake RAID) configured with RAID 1 on two 1TB disks. The ...
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2answers
97 views

Raid1, three of more drives, solution to multi-terrabyte setups in small businesses?

With the space to cost ratio of hard drives leading to capacities that present an increasing challenge to parity Raid systems (URE probability, multi-day rebuilds stressing drives and risking ...
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0answers
47 views

Computer crashed, raid array in trouble

I arrived home today to find my home server was off (not idea why). Turned it back on again and the raid array was failing to mount. /proc/mdstat shows: Personalities : md0 : inactive sdh[7](S) sdc[...
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185 views

mdadm RAID 1 not activating spare after replacing faulty drive

Have issue with mdadm similar to Simple mdadm RAID 1 not activating spare: have replaced faulty HDD in RAID 10 fdisked and added new hdd to mdadmn mdam resynced array After that I see following: ......
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1answer
43 views

Would it be advisable to have 2 raid-1 (mirror) using just 2 physical drives compared to just 1 raid-1 on 2 physical drives?

I'm using 2-bay drive Synology (implies I'm using linux mdadm software based RAID system). The motivation for doing so is to lessen the time rebuild RAID-1 array after it goes degraded. I currently ...
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2answers
66 views

Linux Partition full but it is really not

I experienced a weird phenomenon right after the installation of Debian 9. It seems like my 2To /home partition (sdc1) is already full though I don't have much things in it yet root@ripper:/home/...
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1answer
76 views

RAID5 mdadm faulty / blk_update_request: I/O error

I have five raw images of a server's disks (stored on one external HDD). Each of those disks contains two partitions which are "Linux raid autodetect" (fd) and are members of RAID1 (boot-related; 3 ...
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16 views

RAID puzzle: four drives, one RAID10, one RAID1 one free partition?

I have five drives: drive 0 (0.5tb); drive 1(0.5tb); drive 2(0.5tb); drive 3(1tb); drive 4(4tb) Drive 0 is an sdd that I boot windows 10 off, this drive is not concerned by the RAID. This is how I ...
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0answers
97 views

Metadata of the assambled raid inconsistent with the metadata of the individual drives?

We have a raid 10 with two failed drives, with one drive from each set still functional. When booting into rescue system the metadata seems to be fine and consistent with the expected state. The ...
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2answers
72 views

Is there a way to replace RAID 5 drive without failing it first?

I have a software RAID-5 made up of 3 drives, call them A,B,C. I would like to replace the old C drive with a newer and larger-capacity one to eventually expand the array. This is on an Ubuntu 16.04 ...
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0answers
391 views

RAID 1 disk goes 100% activity all the time with 0 read/write with 0ms response

I have setup software RAID 1 in windows 10 v1709. Main disk is SATA3 ssd but I have also two 3TB Seagate disks in software RAID 1 (mirrored). I have this setup for a few mounths and I had no problems ...
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1answer
36 views

How do I image an existing Win 7 32bit system into an Intel Rapid Storage Technology RAID 1?

Attempting to convert an existing Win 7 32bit system into an Intel raid. Current Process: Boot to non raid drive and install Intel raid drivers. Use minitool to migrate OS to separate drive. Enable ...
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2answers
75 views

What happens when you remove a drive from linux raid?

I have a home media server that gave me a message today saying one of the drives is soon to fail (not happy, still under warranty, that's another issue) I am running Mdadm raid 0 on a 3 drive system ...
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98 views

LVM2 Raid 1 “needs refresh”, but does not refresh or scrub

I'm running a LVM RAID 1 on two disks. Here is what lvs tells my about my VG: root@picard:~# lvs -a -o +devices,lv_health_status,raid_sync_action,raid_mismatch_count /run/lvm/lvmetad.socket: ...
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19 views

Which hardware/software solution provides the highest throughput for reading data from a pool of 4 HDDs being able to survive 1 disk failure

I have 4x 4TB hard disks in my Windows home server and I am after the fastest possible sequential read performance but a requirement is that the hardware or software solution has to survive at least 1 ...
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1k views

Moving Windows 10 software RAID to another machine

I have a quick question regarding the software RAID (0) tool built in Windows 10. I have an array consisting of 3 mechanical (SATA III) hard drives - it is used to process data, there are no system ...
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19 views

Unballanced read/write on mirrored Windows 7 volume

During investigation of problems with one of two identical disks forming Windows software RAID1, I found surprising information. For one of disks SeaTools report: Lifetime Bytes Read: 70.82 TB ...
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1answer
665 views

Did I just lose my Storage Spaces (RAID 0) array? How can I recover it?

I am an amateur photographer and recently decided it was time to stop using external hard drives and move to a custom built storage server. This build was mostly for fun and learning. I started by ...
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108 views

Server 2016 Storage Spaces and NumberOfColumns

I think we all know about the NumberOfColumns issues: https://blogs.technet.microsoft.com/tip_of_the_day/2015/03/17/tip-of-the-day-numberofcolumns/ That said, let's pretend to plan the following (at ...
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1answer
36 views

Canot mount FreeNas 8 mirror in freenas 11

Have a freenas 8 with 2 disks on raid(Mirror) of 1Tb each and only 1Gb Ram. I didn't notice that it only have 1Gb ram and update to Freenas 10 because i need install OpenVPN. When the system boot up ...
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0answers
195 views

RAID5 fails while recovering (mdadm): Any chance to resync?

My RAID5 is going to die because, while restoring a failed HDD, on another HDD read errors occurred and a restore is impossible. I just want to know whether it's possible to restore only a part of ...
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1answer
665 views

Where does the Metadata of Blocks in RAID is stored?

I am very excited to Know about Data centers, then I came across RAID systems. My Questions may be very Silly, Please bear with me. Generally in any RAID Level > 0, Ex: RAID 5 How does the Operation ...
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2answers
1k views

MDADM raid “lost” after reboot

I am kind of scared right now, so I hope you can bring light on my problem! A few weeks ago, I bought a new 2TB drive and decided to setup a software RAID 5 with MDADM on my HTPC (drive sdb, sdc and ...
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1answer
1k views

BTRFS, RAID5 or RAID6 for data storage?

I need to setup a storage for my server. The hardware is a 5 bay enclosure and 5 WD RED 8TB. I have read the statistical probability of a catastrophic failure in RAID5 (= normal RAID) rebuild after ...
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1answer
223 views

Storage Spaces out of space

I'm using Windows 10 Enterprise. I have four identical 3TB disks set up in a Storage Space pool. Each disk shows up as providing 2.72 TB to the pool. I create a storage space with REFS and resiliency ...
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245 views

Mirrored Drives both failed after windows reinstall

Basically what it says on the tin. I was using three drives; one ssd for windows and games etc, and two mirrored hdds for file storage. I had set them up initially using the windows disk management ...
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61 views

Why can't a RAID controller mimic a drive controllers actions on a URE?

There is a fact: a URE renders an entire member of a RAID array as bad, but a URE DOES NOT render an entire drive as bad outside of an array. What is the technical difference that causes this? They ...
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0answers
19 views

Re-use raid 5 in debian that was created in an external raid cabinet

I had 5 disks in a Deltaco raid cabinet configured to run the disk in RAID5. Now the cabinet doesn't work anymore, and I'm trying to get the data from the disks. I hoped that I could just pop the ...
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1answer
111 views

Raid with 4 disk of different size

I have 4 disks, 2 of 500GB, 1 of 1TB e 1 of 2TB capacity. I would like to create a striped array from first 3 disks (500GB + 500GB + 1TB), then mirror the content on 2TB disk. It's possible? I would ...
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2answers
426 views

Can I use s SAS-expander without a dedicated hardware RAID Card?

I'm trying to expand my ZFS raid setup and I have used up all the available Sata-ports on my motherboard. I have read about SAS Expanders online and I think i have understood what they do. But one ...
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203 views

One RAID1 missing after reboot

I'm using Open Media Vault 3 that is based on Debian 8. I already have a RAID1 of 2x4TB WD Caviar Red, and now I'm tring to build a RAID1 with two Seagate Ironwolf 6TB. Whe I build it anything is ...
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404 views

How to prevent an mdadm array check from consuming excessive system resources?

Once a month I've been doing echo check > /sys/block/md2/md/sync_action in order to force a software raid consistency check. The problem is this is a 7.2T RAID 5. The consistency check takes ...