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Questions tagged [software-raid]

Questions which refer to software RAID implementations.

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Mounting External Intel Raid Device on Linux Failing, No Suitable Superblock and Read Past End

I have a hard-disk from a dead machine that I'm trying to mount on my Linux machine. For reference, I'm using Fedora 39 and mdadm v4.2. First, I tried just mounting it, correctly showing it's a RAID ...
Alex Huszagh's user avatar
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19 views

Migrating between BTRFS Profiles and mdadm RAID

I am planning to set up a home NAS. I plan to start it with two identical disks in something similar to RAID-1, but Iʼm thinking about how to make sure I leave my options open for growing it later. ...
Daniel H's user avatar
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25 views

2 Disks Suddenly Showing as Spares on Raid 5 Array

I have a raid5 array in a Seagate Blackarmor 440 nas that suddenly started showing disks 1 and 4 as "failed". I moved all of the drives over to a Ubuntu box and tried to assemble the array ...
shark_lasers's user avatar
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43 views

Restoring a veracrypt volume

I had a great idea at one point, creating an asus motherboard raid 0, where i ultimately installed windows too (yes i know). One of the M.2 ssds, started failing and i had to reinstall everything. ...
Ragge's user avatar
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81 views

How to recover RAID 1 array from a single device during reshape?

I have one disk that is in raid 4 reshaping from a previous raid 1. According to examine mode by mdadm, the disk is marked as a spare in a raid 4 array of 3 disks. I was hoping to recover data on it ...
Robigan 06's user avatar
-1 votes
1 answer
44 views

Getting rid of "Current pending sector" in Microsoft dynamic drive member without resynching to another disk and erasing it

I've got an issue with drive - current "current pending sectors" count is equal 15. I think that it might be only a result of a broken SATA cable, which I've got rid of today.  Long story ...
AdamG's user avatar
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1 vote
0 answers
56 views

Why are random writes to an MD RAID 10 extremely slow (12.5 MB/sec)?

I've just run a fio test against a 6-disk level 10 MD RAID of SATA 2 drives (WDC_WD5003AZEX; 500 GB each) on an OpenSuSE 15.4 machine powered by an Intel(R) Xeon(R) CPU E3-1231 v3 @ 3.40GHz and ...
Neppomuk's user avatar
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3 votes
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Recover a RAID5 logical volume with two failed devices

before bashing me I assure you I know a RAID5 devices can survive only one drive failure. So... why am I asking this? I had two disks disconnected simultaneously from my machine, so raid failed. Also ...
RDX's user avatar
  • 51
0 votes
1 answer
307 views

How to wait for mdadm RAID1 resync process to fully complete?

I currently have a logic to wait for the resync process to finish by looking at /sys/block/mdXXX/md/raid_state to be clean and assume that the resync has finished. However, I don't think this is ...
MoondaKamina's user avatar
1 vote
0 answers
152 views

How do I eliminate file write latency spikes on mdadm raid0?

High Level Problem Summary We are working on an application that requires high throughput to RAID0 for extended periods of time. There are up to 8 independent 5 GB/s data streams being written to ...
Smitch's user avatar
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Mount & Access DATA in RAID1 configured HDD outside of Synology Box on Linux [mount: wrong fs type, bad option, bad superblock]

Background My Two-Disk Synology DS14+ won't power on and I want to access the files stored in the HDDs on my Ubuntu computer. I tried following the official guide on Synology's FAQ but I always get ...
qui2gua's user avatar
3 votes
2 answers
1k views

Creating Mirror (RAID 1) on Windows 10 causes not enough disk space error

I have 2 disks (disk 1 and 2), both are exactly 2794.52 GB. Disk 2 is formatted and contains important data, Disk 1 is unallocated. Note that I cannot back up my data and format Disk 2 due to the ...
Ralkey's user avatar
  • 33
1 vote
1 answer
231 views

Windows Storage Spaces 2-Way Mirror behavior in case of a faulty drive

Assuming a simple, fully-provisioned two-way mirror Storage Spaces setup on Windows 10/11, how does it behave when one of the drives gets faulty: One of the drives cannot read some sectors, and SMART'...
Fit Nerd's user avatar
  • 537
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1 answer
287 views

Is it safe to use Windows 11 Mirror Storage Spaces with BitLocker Auto-Unlock

There have been reports from a few years back (albeit both about Windows 10, not 11) regarding some issues / incompatibilities that lead to data loss / corruption of using Windows Storage Spaces where ...
Fit Nerd's user avatar
  • 537
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0 answers
111 views

Zpool hung while attaching a new disk, now faulted

I was attempting to expand the storage on a large ZFS pool, adding a similarly sized drive from a USB bay. The pool was in use, and the zpool attach command hung. After an hour, it still hadn't ...
Kaylee's user avatar
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0 answers
141 views

Best way to use Windows' RAID 1 to have an hot backup

I'm looking for a way to direct Win10 Pro RAID system to direct the reads to the fast drive in the mirror I'm on Windows 10 PRO and have regular (but not too frequent) backups of my system. The system ...
Simone Avogadro's user avatar
0 votes
1 answer
773 views

Could someone, anyone, help me rebuild my RAID 10 array please?

A little background information just to help (hopefully)... I was doing a backup from my Synology box over the weekend and all was going very well up until Sunday morning when I've tried to re-connect ...
Phill's user avatar
  • 23
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0 answers
50 views

How to rebuild mdraid array when I forgot to do a mdadm --remove?

I have physically replaced the /dev/sdkb disk but I forgot to a : sudo mdadm /dev/md4 --remove /dev/sdkb3 Here is the status of the array : $ sudo mdadm -D /dev/md4 /dev/md4: Version : 1.2 ...
SebMa's user avatar
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1 vote
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Cannot understand disk architecture on Synology NAS RS3412RPxs : is /dev/sdkb3 a physical or logical disk?

I have the following synology RS3412RPxs NAS : $ uname -u synology_bromolow_rs3412rpxs $ with the following MD-RAID array rebuilding /dev/sdkb3 on the RX1211rp-1 extension unit : $ sudo mdadm -D /...
SebMa's user avatar
  • 1,863
1 vote
0 answers
35 views

Assemble raid6 array from spares only

This question is related to Managing raid6 device with pacemaker, but nothing in the question linked is relevant to this question, except the fact that Pacemaker is involved. For the purpose of this ...
Nykau's user avatar
  • 51
2 votes
1 answer
93 views

Managing raid6 device with pacemaker

I am setting up 4 hosts, each exporting one local storage device over iscsi with target. Every other hosts imports it such that each host has concurrent access to all 4 each storage devices. I built a ...
Nykau's user avatar
  • 51
0 votes
0 answers
756 views

Ubuntu Server mdam device disappeared after reboot

I have a server (Ubuntu 22.04 LTS) running a software RAID 1 with mdadm, consisting of 2 WD Red disks. After booting the server, a Windows client couldn’t find the Samba share. I logged into the ...
Mauricio Gomez's user avatar
1 vote
2 answers
280 views

Does multi storage pools make sense to avoid more damage from a bad disk?

I am a beginner of NAS(and its hardwares), and I get some basic knowledge about RAID from Synology's guidebook. There are many tutorials taught me how to use my hard drive devices to create the ...
Krahmal's user avatar
  • 111
0 votes
1 answer
1k views

Re-adding disk to md raid fails

I have a problem with a Linux software raid and don't know what are the next steps to overcome this. It's a Raid 1 of several partitions. After an unclean shutdown the raid started unclean degraded ...
dinken's user avatar
  • 1
0 votes
1 answer
212 views

Setting up External Storage for Micro Server

Need advice on a relatively cheap and stable way to set up external drives with an Optiplex micro. I upgraded my old homelab server (i5 with ZFS RAID 1 over SATA) to an Optiplex 5060 micro. Optiplex ...
cantStop45's user avatar
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0 answers
210 views

Where can I see Intel® Virtual RAID on CPU logs on Windows Server 2019 and check if there is any error on any Raid 1 disks?

I have the below system and i noticed that it is repairing the raid right now. I want to be sure that there is no bad sectors on any of the raid disk but I don't know how can I do that Here all the ...
Furkan Gözükara's user avatar
1 vote
0 answers
224 views

How to deal with LVM RAID mismatches – are there benign causes?

I employ LVM with raid1 volumes both at home and at work. One of the disks in my home server has been starting to report S.M.A.R.T. selftest read failures. Looking for ways to investigate the severity ...
Magnus Holmgren's user avatar
-1 votes
2 answers
1k views

Expand or shrink striped array in Windows?

I plan to replace 2 of my HDDs (let's call them A & B, they're not in RAID) with 2 larger HDDs (C & D) in software RAID 0 (Striped volume in Windows). The one problem I have is that my case ...
kotekzot's user avatar
  • 923
4 votes
1 answer
219 views

How much space does a Linux software RAID1 REALLY occupy on its component devices?

A precise answer to this question is important when shrinking the array and its components. As an example, I have a RAID1 /dev/md0 set up on two partitions, /dev/sda1 and /dev/sdb1. Both fdisk and /...
Marcin Owsiany's user avatar
0 votes
1 answer
3k views

Determine why drive was removed from software RAID array and rebuild safely

I have a fairly large Linux software raid6 array, with 16 devices. Recently I noticed that a drive appears to have failed out of the array: $ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [...
stiltzkin's user avatar
1 vote
2 answers
4k views

How to identify physical disks in Linux RAID

Is there a way of reliably being able to tell which physical drive in a RAID relates to the software device name given to it by the OS? I have a RAID5 array of consumer-grade USB disks (and one spare) ...
TommyPeanuts's user avatar
1 vote
1 answer
141 views

How to use a very slow HD with a fast HD as if it were just one

My problem is quite specific: I need to run an application that has 500 GB but I have two HDs: a fast 200 GB and a very very slow 2TB. The 2TB HD is external USB and was mounted over the network (NFS) ...
Felipe's user avatar
  • 2,188
0 votes
1 answer
694 views

Questions about external SSD software RAID?

I currently have two 2.5" 4TB SSDs. My plan is to get an external Thunderbolt enclosure with a minimum of 4 bays and no hardware RAID (e.g. OWC Thunderbay Mini), and buy two more 4TB SSDs to make ...
St4rb0y's user avatar
  • 213
1 vote
1 answer
2k views

I want to collect system information using bat file

I hope you all are doing well. Help me please. I want to collect system information using bat file like: List of Software OS information System Hardware details. I had some code which collects the ...
Utthunga's user avatar
2 votes
1 answer
6k views

Create a bootable RAID 1 in Windows 10/11?

I have two NVME 2TB PCIe X 4 and I am using an AMD 5950X. How do I create a RAID so that it’s bootable for a Windows 10/11 install?
GettingStarted's user avatar
0 votes
1 answer
445 views

Should ZFS RAID-Z2 theoretical maximum be 256+2 drives?

For RAID 6 in wiki, the extra priority check bit Q is calculated by shifting of bits. https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_6 Suppose we would like to distribute our data over n {\...
midnite's user avatar
  • 571
0 votes
0 answers
168 views

Raid 10 gone - how to rebuild / find informations

Because of another task, i had to disconnect all the raid hdd's from my pc. Shutdown -> disconnect hdd's -> boot -> shutdown -> connect hdd's -> boot -> raid completely lost. mdadm --...
eXe's user avatar
  • 101
0 votes
2 answers
3k views

How to restore my RAID5 after mistakenly failing one of the drives?

I have a RAID5 on Xubuntu 20.04, created with mdadm. I failed one of the three drives by mistake. The array is still working, but I get errors or responses I do not understand from my attempts to ...
4Dummies's user avatar
  • 183
0 votes
0 answers
6k views

Improve mdadm RAID5 with SSD Cache

I have the following Setup: 3x 3 TB SATA HDD With software raid connected to a RAID5 On top of this LVM for snapshots (backup) And on top of LVM EXT4 formatted. Actually around 400GB is used. I have ...
C. Hediger's user avatar
0 votes
1 answer
181 views

raid 4 3 disks + 2 parity disks

I have a raid 0 with 3 disks and I want to be able to lose some disks without losing data. I'm using mdadm and I already started to grow my config Current config: Personalities : [raid0] [linear] [...
Matoran's user avatar
  • 13
1 vote
1 answer
129 views

My Software RAID 5 has 4 3TB HDDs, now two of them have bad sectors. What is a good way to replace them?

I run mdadm on Ubuntu 18.04 to build a RAID 5 array of 4 3TB drives several years ago. The machine was not running for years. Yesterday I powered it on and found two of the disks have a bunch of bad ...
Harper's user avatar
  • 123
0 votes
0 answers
960 views

How do I access a Windows 10 Storage Spaces from another Windows 10 install?

BACKGROUND So a while ago (maybe 3 weeks ago) I decided to divide my NVMe in half to duel boot Windows and Linux. In the process I somehow deleted my Windows boot partitions or something. I honestly ...
Faaire's user avatar
  • 1
1 vote
1 answer
263 views

Can Clonezilla work with Windows striped volume?

Let's assume I have striped volume in Windows 11 (two disks). Will Clonezilla be able to create and later restore images of both disks, so Windows will still recognize them properly as striped volume?
N3tskyy's user avatar
  • 13
2 votes
2 answers
8k views

What exactly is Parity Consistency Check that Synology NAS runs when a new disk is added and why does it normally take a long time to complete?

What exactly is "Parity Consistency Check" that Synology NAS runs when a new disk is added and why does it normally take a long time to complete? Why does the process takes a long time? (can ...
dennismv's user avatar
  • 287
4 votes
2 answers
5k views

Is there a way to install Windows onto Dynamic disks?

I like using the Dynamic disks with striping in Windows and was wondering if I could install from a Windows ISO onto a set of striped dynamic disks. So far in my testing, that's not possible. I get ...
Sawtaytoes's user avatar
0 votes
2 answers
123 views

Software RAID10 done via Windows 10 - would it remain after system re-installation?

Configuration: 4x1TB HDDs added into a storage space in Windows10 with 2-way mirroring, resulting in 2TB storage (so, I believe, "software-RAID10"): screenshot of the setup The question is - ...
Fed's user avatar
  • 1
0 votes
1 answer
351 views

Recoverability of Windows 10 storage pool (Software RAID 5)

I'm currently looking into RAID 5 for my growing data for my home PC and some things are still unclear to me. I currently have each of my drives backed up by an additional "backup" drive and ...
Shiwayari's user avatar
0 votes
1 answer
1k views

Create RAID 1 on Windows 10

Usually I work with RAID controllers however in this case this is not possible so I need to use the "Windows software raid" (or some other kind of software raid for that matter). If I have ...
Albin's user avatar
  • 10.8k
0 votes
1 answer
96 views

What kind of raid I have?

I have the raid option on bios and I got Intel chipset SATA/PCIe RST premium and Microsoft Storage Spaces controllers under storage controllers on device manager but both my disks on basic mode. Is ...
guillemot's user avatar
0 votes
1 answer
218 views

How to reshape a 2-disk RAID1 into a 2-disk RAID5 using mdadm?

According to How to remove a drive from a non-standard 2-drive RAID 5 array?, "with mdadm, a 2 drive RAID 5 is binary identical to a RAID1". If that is so, what's the mdadm command line for ...
Sixtyfive's user avatar
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