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Questions tagged [raid]

RAID, an acronym originally for Redundant Array of Inexpensive Disks (today usually interpreted as referred to as Redundant Array of Independent Disks), is a technology that provides increased storage performance and reliability through redundancy by spreading data across multiple disks using various algorithms (RAID-levels). RAID can be implemented in hardware storage controllers, or in software, usually as operating system/kernel features.

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Ex Raid Disk appears as two disks [closed]

i have two 6TB HDDs, which are out of a RAID System. When i connect them, the show up as two different disks. Disk1 2.2TB and Disk2 3.8TB. How can i setup the Disks to show up as 1 disk? This is my ...
BSDGuy's user avatar
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Mega RAID suddenly, incredible slow after a consistency check and nothing found

I am having difficulty solving this problem. I have a RAID consistency check every Sunday, and I checked today after my colleagues complained about the server being painfully slow. I checked iotop, ...
danone's user avatar
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How can I fix wrong mdadm.conf in a working raid 1?

I have a server linux with CentOS Linux release 7.9.2009. Server has 2 disks with a raid1 software. Raid1 seems ok, and if i run cat /proc/mdstat this is the output: Personalities : [raid1] md124 : ...
Castellino Roberto's user avatar
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When transfering a RAID array to new computer, do the RAID adapter drivers need to be the same?

I have a Plex server running on Fedora 36 Server, with an ARECA 1883 controller running two RAID enclosures (approx. 500TB). I am currently building a new server, again on Fedora, with the goal of ...
RDLR's user avatar
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Synology SHR 2 disk: replace HDD with SSD

I have a DS218+ with 2x3TB WD Black, all allocated to single storage pool (SHR). The disks are hot-swappable. The volume is almost full and I'd like to replace them with 2x4TB Crucial SSD. Only DSM 7....
andig's user avatar
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How do i safely add a missing partition to existing raid1 array in RHEL8

I did a RAID1 to lvm for / partition but i forgot to RAID1 /boot and /boot/efi standard partition, how do i safely add the missing partitions into RAID1 array? click here for image of partitions
wlchew's user avatar
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Raid 5 replace with read errors

I have a software RAID 5 with 3 disks. For a few days, sda has been giving errors, and today the new disk arrived. I launched mdadm --replace and the process started correctly, but due to read errors ...
Gabriel Rolland's user avatar
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Imported Linux raid (raid 5) assembled ok but cannot access data

This setup is a little convoluted. I have images of three 8TB drives from another Linux system that contain an md raid-5 setup. I have mounted these images as physical drives in windows (...
Walter ZAMBOTTI's user avatar
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MegaRAID LSI SAS-9266-8i no RAID6 available after flashing firmware

Dear Good People of serverfault.com, I flash my MegaRAID LSI SAS-9266-8i RAID controller with latest Mega Firmware found here broadcom.com using storcli64. Everything went fine However, it seems there ...
Flan Alflani's user avatar
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Upgrade HDD to SSD - RAID 1

I will upgrade a RAID 1 with 2 HDDs to a RAID 1 with 2 SSDs on a Dell T420 server (PERC H310). But first I'd like to make some tests with a new OS installation on this new RAID 1 with SSDs. Can I take ...
Robolts's user avatar
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What is the risk of putting a RAID superblock at the end of a device?

I want to set up a RAID 1 array using mdadm to store backups (I'll be using rsnapshot to do the actual backups). I've read that using metadata 0.9 or 1.0 format with RAID 1 is advantageous because ...
jhaiduce's user avatar
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Raid10 Shows 5 Active Drives!

I built two raid 10 arrays during an Ubuntu 22.04 Server install, and the system works fine, but one of the two RAID 10 arrays shows all five drives (1 that should be a spare) in "Working" ...
bkeahl's user avatar
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Proper usage of linux mdraid spare-group

I'm going to create two raid1 arrays, lets say: 2x1tb - /dev/md1: /dev/sdb, /dev/sdc 2x2tb - /dev/md2: /dev/sdd, /dev/sde My idea is to use one additional 2tb hdd /dev/sdf as hot spare which will be ...
domino_pl's user avatar
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IMSM (Intel Matrix Storage Manager) device is not detected by Linux kernels 6.6.x/6.7.x but works in 5.19.17

In kernels 6.x.x /dev/md/imsm0 does not appear at boot. The only difference I see in dmesg which seems to be relevant: block device autoloading is deprecated and will be removed. Printed in 5.x.x, ...
midenok's user avatar
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Hardware RAID controller replacement/drawbacks

Apart from the price, is there any drawback to use hardware RAID controller to create a RAID 1 (mirror) array? I mean, for example, is it possible to create the RAID 1 array with the baseboard RAID ...
Halacs's user avatar
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storcli64 not importing a foreign dg with disks previously offline

I experienced a weird cascade of disk "failures" w/in a few minutes on a AVAGO MegaRAID SAS 9361-8i on Linux. During this time, a hot spare drive was never spun up. Ignoring a few ...
A Flying Gideon's user avatar
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Esxi lists two disks instead of one RAID1 [closed]

I'm trying to install Esxi on a Dell PowerEdge R210 II. I enabled RAID in bios and then created RAID1 (CTRL+R at boot). This part is OK. But the Esxi wizard lists two disks when I need to select ...
Kan's user avatar
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Brand New RAID Array Shows 99% Full (Adaptec ASR-8805)

All - Just brought a new array online on Windows 11 build. I created the array in the Adaptec BIOS and did Build/Verify until it was 100% complete. I saw the drive when I booted into Windows (separate ...
TheKrizzz's user avatar
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FreeBSD ZFS raidz1 Started a (da59) drive replacement. During resilver, second drive (da60) failed

Our system started slowing down... Found a couple of drives in the same raid that looked scary. Replaced the drive that S.M.A.R.T. marked as failure eminent. (da59) Then da60 started to error. Finally ...
Jon Bivin's user avatar
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Unable to format external SSD drive which was member of a raid

I try to reuse this drive as a single storage but if I zero it's super blocks then it restarts the md127 component. Tried everything like format from windows 7 with no avail...
user3018234's user avatar
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Is an in-place upgrade of HPE storage controllers non-destructive?

I've taken over a relatively small shop and would like to upgrade a host that's in production. Looking to get a more definitive answer to the title and would appreciate some firsthand experience. The ...
AKBingo's user avatar
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Is it possible to post-install disks in raid?

I have just received my new Ubuntu 22.04 workstation from Lenovo (Thinkstation P620) It has 2 1TB disks, that I want to use in RAID 1 for /, and 4 2TB disks that I want to use in RAID 5 for /home. ...
Antonello's user avatar
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LVM Expand RAID1 with Asymmetric Segments Across 3 Heterogeneous Disks

I have 3 disks: one 1TB drive (A1), one 2TB drive (A2), and one 3TB drive (B). Currently, A2 has data on it in one LV that is 1.6TB in size. A1, A2, and B are PVs, in a volume group MyVG. I desire a ...
byteit101's user avatar
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SR650 - Raid 5 - HDD

Last week one HDD went to critical status in RAID 5. I was able to replace it and the rebuild started. Everything went smoothly until today. I wanted to replace that HDD because the size was not as ...
ptr808's user avatar
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Reassembling MDADM on Live Ubuntu

Background: I have a 6x 4tb MDADM array on Box 1. Box 1 developed MB/CPU issues that cause a power-down halt about 15-25 minutes into operation, but during the uptime the array is accessible just fine....
Russell Anthony's user avatar
2 votes
1 answer
432 views

dRAID, Parity 1 + 1 Distributed Spare Better than basic RAIDz2 for 5x12TB HDDs?

Stumbled on dRAID recently and was grokking the docs for OpenZFS on linux and I came away with a conclusion from the chart that I wanted to double check. This is a brand new system that I'm currently ...
brianclements's user avatar
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Write speed to NVME disk degrade after some time of active work

I have a fairly general question, but maybe someone already had similar behavior. I have few servers with 20 nvme micron 7450 pro 15 TB disks on each. On all servers I created raid 0 using mdadm ...
igor_shk's user avatar
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trying to rebuild RAID 5 array with failed drive, `/dev/sdc1 has no superblock - assembly aborted`

I have ~20TB MD array spanned across 5 6TB hard drives. yesterday one of the drives failed and the system stopped booting. I'm not very good at Linux, so whenever this happened in the past, I'd simply ...
Nicolas Straub's user avatar
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1 answer
112 views

Is it possible to backup across multiple hard drives?

I'm going to be setting up an 8x20TB ZFS RaidZ2 with no spare. This will give me roughly 100TB of storage for large 3D model files. I want to purchase some extra HDDs so I can periodically backup and ...
Maxthecat's user avatar
2 votes
1 answer
93 views

Is there a way to manually replace one disk in Microsoft Storage Spaces?

I got a microsoft storage spaces which using 4 disks and acting as RAID0, recently I found one of them failed. I knew I should add a new disk into this space and kick the failed one out, but instead, ...
Micr's user avatar
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Disk I/O over 100% (~400%)

I'm working with an Ubuntu OS cluster which is using a Job scheduler. Tens of jobs are running in parallel and all jobs read/write in the same disk Array, 3 SSD disks with software RAID 0. I do not ...
Emma Athan's user avatar
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1 answer
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Setup raid for a volume group consisting out of 2 nvme drives

I bought 4 x 4tb nvme volumes. I already tested them and they are doing fine. Operating system is Ubuntu-server 23.04. What i want to achieve is the following: 2 drives act as one. (I think that is a ...
Christopher von Blum's user avatar
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Can MegaRAID controllers use their writeback cache in JBOD mode?

Similar to this question, but for Broadcom/LSI controllers: Can MegaRAID controllers use the onboard disk cache for JBOD drives? (I would like to enable the controller's hardware cache and then use ...
KJ7LNW's user avatar
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HP P440AR version 7.0 with Samsung 870 1TB drives - RAID6 esxi 8.02

I have a ProLiant ML350 Gen9 with P440Ar Raid controler, on which i added 6 Samsung 870PRO 1TB drives and put them into RAID 6 configuration with additional SSD drive with esxi 8.02 Everything went ...
Lonko's user avatar
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ZFS scrubbing keeps reparing disks

I've got two SSDs in a RAID 1 (mirroring) configuration on ZFS. They are quite old (~10 years I guess) but have never been used much in these years. That's my configuration pool: tank state: ONLINE ...
Beowulf þe god cyning's user avatar
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HPE Dl380 Gen 10 + P822 + SAS Disks + Truenas +HBA Mode

Hi I have a DL380 Gen10 server and an P822 SAS expander laying around which I want to repurpose as a truenas box. I have a bunch of 2TB SAS drives which I want to use for this. I have managed to ...
Michael Brannelly's user avatar
6 votes
3 answers
2k views

Can I make md (Linux software RAID) more fault tolerant?

I have a particular hard drive in a RAID 1 mirror that gets failed out under heavy load, typically, when I run a full backup. There is nothing wrong with the drive. Ok, it is getting one error when ...
Nick's user avatar
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RAID 6, SSD Cache, Journaling, mdadm, LVM, Filesystem Strategies for Data Resiliance

I'm replacing a NAS server thats been in loyal service for almost a decade now. It will be repurposed as my offsite backup, but now I'm setting up a new NAS from scratch for homelab and need some ...
brianclements's user avatar
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2 answers
85 views

Raid 6 mdadm and 20 disk

Is it possible to add more than 2 disks for parity in mdadm raid 6? I need to build a storage of 20 disks. How to build a raid that would be reliable?
PetroIvanov's user avatar
2 votes
2 answers
124 views

Storage configuration for GPU servers (ML training)

We have recently purchased a couple of high performance GPU servers to use in training AI/ML models and the job of set up and administration has fallen upon me. I'll preface this by saying I am ...
Alex Shenfield's user avatar
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How to get Debian RAID 1 preseed to populate EFI partitions on both disks?

Most similar question I found: Ubuntu software raid on efi, how to boot off second drive? My situation is, I have a working preseed file for Debian installation that will configure my NVMe drives to ...
Wildcard's user avatar
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Smart array P212 error code 727

We recently purchased HP DL380P GEN8 server and D3700 enclosure with 20TB of disks. I wanted to connect both servers with Smart Array P212 but I encountered and error once I tried to configure the ...
Imcuser's user avatar
4 votes
2 answers
996 views

Spin down hot spare when not in use

I have an avago raid controller managing an array of 4 disks + 1 hot spare. ---------------------------------------------------------------------------------- EID:Slt DID State DG Size Intf Med ...
TSG's user avatar
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4 votes
1 answer
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Which software is recommended for building RAID in Windows 10?

We are running Windows 10 LTSC Enterprise. The workstation has 2 HDDs. I have created RAID1 with Storage Spaces. It is working well. But if I disconnect one of the disks, the notification comes only ...
Elvin Mammadov's user avatar
5 votes
1 answer
221 views

Unable to get my rsync of my software RAID 6 past 40MB/s. Looking for suggestions

Wondering what I could adjust to get my RAID 6 Software Raid to resync quicker. Currently it's proceeding at max of 64MB/s and averages to something around 25MB/s. Hoping to get it to 200MB: [...
DeliciousBoulder's user avatar
2 votes
1 answer
160 views

Use storcli to get / set spare drive

I have an LSI controller with a R10 array consisting of 4 drives + 1 spare. Storcli reports: ---------------------------------------------------------------------------------- EID:Slt DID State DG ...
TSG's user avatar
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4 votes
2 answers
295 views

Is LSI rebuilding as background task

I'm investigating the state of an LSI raid array that might have recently suffered a drive failure. The array had a spare configured, so the array is not degraded. However, the storcli command ( /...
TSG's user avatar
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2 votes
1 answer
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How check if UBad disk on LSI RAID is really failed

I have taken over responsibility for a new server with an LSI RAID card, configured with 4 drives (in R10) plus one spare. I normally manage RAID arrays by taking down the server and configuring via ...
TSG's user avatar
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install disks with raid on a controller of the same model? without losing data. hp dl160 g9 - b140i

I have an HP DL160 Gen 9 server with 4 disk drives, 2 HDD with RAID 1 and 2 SSD with RAID 1. This server is restarting repeatedly when the esxi System boots. If I install these 4 disks on an identical ...
Larvin Santis's user avatar
2 votes
1 answer
135 views

BIOS/Hardware Mirror Drive RAID 1 - Reliability, Consistency and Synchronization

Assuming I have enabled in BIOS a (presumably) hardware RAID in mirror aka RAID1 mode (as opposed to Software-one provided by the OS like Windows Storage Spaces), how is it actually ensuring data ...
Fit Nerd's user avatar
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