Questions tagged [software-raid]
Questions which refer to software RAID implementations.
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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) ...
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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.
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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 ...
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Unable to reassemble md raid on drives pulled from ReadyNas Duo v1
I'm toying with a ReadyNAS device that I've recently acquired. It is a SPARC-based box, and it runs linux.
As device is pretty slow, I've pulled one drive out of array, hoping to populate it with ...
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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 ...
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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 ...
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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 ...
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Is a Simple Storage Pool the same as software RAID 0 in Windows 10?
I have a single SSD in my PC as a boot drive with two 1TB HDDs that I'd like to setup in RAID 0. I'm not storing anything important in RAID 0, just my Steam library. I figured setting the drives up ...
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mdadm device missing
After a reboot my /dev/md0 device was missing. This is a RAID-1 array from two partitions of two harddrives. On each of the harddrives is another partition, which together belong to dev/md1. However, ...
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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 ...
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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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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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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 ...
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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 ...
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Three-way mirrored RAID in Windows 7?
I sometimes find bit-rot in some of my files. This is rare, but does happen. It annoys me that this is a) undetected for long periods of time and b) not fixable (except from backups), even with the ...
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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 ...
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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'...
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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 ...
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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] [...
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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 ...
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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 ...
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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 ...
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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
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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 /...
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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 ...
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chunk, ext4 stride and strip-width size for RAID level 1?
the man page for mdadm says: "[chunk] is only meaningful for RAID0, RAID4, RAID5, RAID6, and RAID10." i.e. it does not apply for raid1. even if you pass the value, it will say ignoring ...
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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 ...
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Take one disk of external mdadm data raid 1 to travel
I have a mdadm software raid 1 on external disks with media data.
For travel I want to take the data with me.
I imagine to set the raid and the underlying filesystem in readonly mode and take just ...
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How to convert a software RAID 1 partition to non-RAID partition?
RAID is not a backup, they say, but only now I can see that what I really need is an (external) backup.
So, I would like to convert a (software) RAID-1 partition to a non-RAID partition (ext4) in my ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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Linux MD software raid stripe cache size
From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory.
By increasing this value you can get a ...
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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 ...
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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 ...
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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?
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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 ...
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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 /...
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Why make a partition at all for mdadm/raid?
i have 4 disks, sd[a,b,f,g] of various sizes that I want to 'merge' together. I am using mdadm to achieve this.
my question is, what's the difference between --
mdadm --create /dev/md0 --level=...
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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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Thinking of a RAID-5 Setup - What is the optimal configuration?
I am planning on setting up a RAID 5 array on my data storage drives using Windows Server 2008 software RAID. I currently have a 500 GB drive for the server OS and two 1 TB drives for data storage. ...
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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) ...
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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 ...
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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 ...
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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 ...
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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 {\...
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New mdadm RAID vanish after reboot
I have problems with mdadm after reboot, I can't reassemble /dev/md0 .
I work on debian wheezy.
I have done the following steps::
sudo mdadm --create --verbose /dev/md0 --level=6 --raid-devices=4 /...
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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 ...
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