Questions tagged [raid1]

RAID 1 or Mirrored RAID uses two or more disks that store the same data.

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RAID 1 HDD replacement with used HDD

We have an HD Proliant G8 with 2 HDDs built RAID 1. One of the HDD drive light becomes amber and iLO shows Bay 2 disk has a failure. I'd like to replace the failed drive with one pulled from other ...
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Recover failed RAID1 disk no superblock

I had an Ubuntu installation on RAID1, which was running as degraded for some time without me realizing. The active disk started to have bad blocks and no longer booted, which is when I realized that ...
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mdadm: power failure during raid1 rebuild

RAID1 array created with mdadm; array was rebuilding when there was a power failure. On coming back up, the array seems to be dead. # cat /proc/mdstat Personalities : [raid1] md0 : inactive sdb1[2](S) ...
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How to expand logical volume in HP ML150 gen 9 , smart hba h240

I have replaced two hotplug 300gb sas drives with 600gb sas drives (raid 1) . The smart storage administrator have no option of increasing the logical volume to the new drives. So now i'm stuck with ...
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115 views

On Ubuntu, how do you recover data from a single disk of a raid array from another device

I have a 2 disk NAS device using RAID 1 mirroring. When disks started failing I wanted to buy bigger disks so as to upgrade the volume size. However the device couldn't handle mirroring the original ...
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Data layout on RAID-1 Array

For the sake of this question, assume a RAID-1 array of two identical drives. RAID-1 (Mirroring) stores an identical copy of the data on both drives. How identical is the drive layout? Are the drives ...
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Added 4Tb HDD to Iomega IX2-200 but cannot extend the volume

I have a Iomega IX2-200 which came with 2Tb (1.8Tb usable) space. It has two disks set up as RAID1. I am trying to upgrade this to 4Tb disks. So far this is the process I have followed: Remove the ...
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59 views

How to replace Raid1 hard drives with large ones using Storcli tool

I have raid1 with 2 physical drives (SATA 3.637 TB). I want to extend it's size with large ones without losing data. ----------------------------------------------------------------------------- DG ...
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Recover data from broken RAID 1 drive

I need to save files from a Buffalo NAS Linkstation with two physical drives that is not working anymore (2TB each, Raid 1). Error message says: The bad sectors in the hard drive may have reached a ...
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220 views

Very slow read/write on software raid1 with nvme device on Ubuntu focal

I have a server with Ubuntu 20.04.1 LTS with NVME ssd devices running on raid1 and the hard drive operates so slow! to open a gzip file to of 500MB to a 3.7GB takes a while.. way more then it should. ...
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MDADM RAID-1 “not large enough to join array” on identical partition tables

I have two disks with identical partition tables (sudo sfdisk -d /dev/sda | sudo sfdisk /dev/sdb) that mdadm refuses to merge as a RAID-1 array. $ sudo mdadm --manage /dev/md0 --add /dev/sdb1 mdadm: /...
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Can I Move RAID-1 (Mirrored) Hard Drives From a Hardware Raid Controller to Software Raid?

Old server: 3ware 9650se PCIe hardware RAID controller with 2 sets of RAID-1 (4 total drives, 2 mirrored) with a 5th drive as a hot-spare. New server: Software RAID is the only option. Plan to run ...
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90 views

Troubleshooting frozen disk when queue is full

I have a system (centos 7.8) with k8s installed on top. After a few days of normal operations (system load is ~30% and disk activity is around 60 iops, not saturated), the system goes to an unstable ...
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Using mdadm - RAID1 array doesn't mirror other disk

Currently I am building a nextcloud server on Ubuntu 20.04. I got one disk for the OS to run on a 320GB harddisk. And I want the data directory to be in a raid1 array, because if one drive fails we ...
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381 views

Recommended approach for booting from Linux software RAID for redundancy

I am looking for the recommended approach to setting up software RAID (using mdadm) on Centos 8 to provide redundancy. In my setup I have 4 identical disks, but I assume the answer should also be ...
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ECC-Error on a new disk in RAID1

I am managing an aging Linux server that is running a postgres database. I have run into an ECC-Error on a RAID1 disk. The 2 disk RAID array is on a 3Ware 9650SE-8LPML PCI card (this is an old system)....
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Ubuntu 18.04 “Advanced Installation” official guide for RAID 1 installation appears broken for UEFI installation

I had no issues earlier with RAID 1 setup on Ubuntu 16.04. However, on 18.04 it has been a struggle. I finally located this guide. I followed the guideline to the dot. However, I am unable to set the ...
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Can we move RAID configured disks across different Servers

I have 2 SSD disks configured as RAID 1 using RAID feature in BIOS. By chance if my motherboard and processor is damaged, can I connect these 2 SSD disks to another Server. Will these SSD disks boot ...
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What is more stressful for an SSD drive, a RAID-1 sync or multiple OS and software installations?

I was wondering recently, what is more stressful for an SSD drive in a RAID-1 array, a RAID sync or multiple installations of OSes and software. Say for example that you have a new server with empty ...
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ML350p Proliant Server Gen 8 - Can't Rebuild Raid 1 New HDD (Diff Firmware)

I'm having an issue on our HP Proliant ML350p Gen 8 Server. A drive was flashing amber/green and had the health led stating degradation (amber). We bought an exact replacement HDD, upon arriving I ...
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Can I perform a RAID-1 Setup on Linux over an existing disk one containing data?

I have the following setup on my Fileserver: 2 HDDs In intel RST RAID-1 containing Windows OS+DATA And I want to migrate into the following configuration: 1 SSD containing CentOS 8 2 HDDS ...
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Can I create a RAID-1 using Intel RTST on existing FIlesystem?

I am installing ubuntu on a fileserver having existing data. The server has 2X4TB disks in RAID-1 configuration usint Intel RTST. And Because the one is failing (the RAID-1 is degraded) I disassembled ...
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How do I specify which drive mirrors to which when raid-1 mirroring a linear lvm volume made of drives of different sizes?

I want to use mirroring together with LVM snapshots to have both physical redundancy and the ability to rollback problematic changes. I have and idea about how to arrange this with the disks I have, ...
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36 views

Is my mdadm RAID1 running?

Sorry for the stupid question but I'm really confused. Is my RAID1 running and in a good health? lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux ...
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138 views

Auto boot degraded RAID1 on Debian 10 (Buster)

I want my server to boot without manual intervention on degraded RAID1 from second drive on Debian 10 (Buster). It boots when I detach the second hard disk but it doesn't boot when I detach the first ...
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mdadm raid1 with three disks where two disks would be a subset raid [closed]

I currently have two disk of the same size (4TB each) in raid1. I'm wondering if it's now possible to add an additional disk of size 8TB and have it as raid 1 with the other two disks acting as raid ...
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36 views

When two different companies of hard disks can be raid together? [closed]

I'm trying to replace the hard disk due to the aging of the server computer. Currently, the server computer is composed of two 2tb hard disks as RAID 1. The model number of the hard disk is Seagate's ...
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Importing a Raid1 single disk and use it as a drive

I had an Intel raid1 disc array (3tb each) and had to rebuild the system. Now I have both disks but really don't need raid anymore as I'm just planning on using backblaze to backup my data on the PC. ...
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56 views

Rebuild Linux Software Raid 10 Adding Replacement Disk

I have a CentOS 6.10 Server with 4 x 2TB Drives. One was failing (bad sectors and causing major disk IO bottlenecks). This is a headless server in a remote data center. Technician is going to replace ...
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Storcli - migrate from RAID1 to RAID10

I have a system with two hard drives set up in RAID1. I've purchased another two - same model/size etc. - and now I want to reconfigure them to RAID10. I have storcli installed in VMWare and is ...
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243 views

Raid Status - Online vs Ready vs Foreign

What does Raid state Online, Ready or Foreign means? What other state can it be? What needs to be done in such state? I think Online is the only safe state. What are the DO's and Don't during ...
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52 views

What would you call this “RAID” ? RAID 1+6? [closed]

I have Snapraid running as snapshot RAID6 (2-parity disks) for my 9 disk array which calculates new parity once a day. Then I have Drivepool duplicating certain very important folders on the array to ...
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What a benefit of RAID 1,5,10 vs every night simple diff backup

Given: 2 HDD in RAID and case when we lose 1 of them after 3 years: If we use RAID 0, we lost data If we use RAID 1, we have a copy on possible also bad-health disk, any restore may cause failure ...
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Hardware Raid 1 vs Raid 10

What are the advantages/disadvantages of raid 1+0 vs raid 1 regarding the following: Recoverability. How easy is it to recover data from a raid 1+0 array if the raid array controller fails and you ...
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104 views

Multiple RAIDS on same disks [closed]

On a server, I have 3 SATA disks. I'd like to create a root partition in RAID 1 of 50GB and a data partition in RAID 5 with the remaining spaces on my disks. There would be 2 different RAID types on ...
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106 views

Using raid-1 madm to shrink an existing 8TB EBS disk live. Possible ? Risks?

Initial situation I have a 8 TB EBS drive on Amazon (ext4, directly mounted without partitions) I didn't use sw-raid for ages, so my assumption might be wrong that I can shrink the disk that way. ...
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286 views

Unable to enable cache disk in Intel Rapid Storage Technology

Okay, this is driving nuts: I have a Dell XPS 8910SE that was originally running Windows 10 Pro 1809. The OS disk was using Intel Rapid Storage Technology for a RAID1 array, and an m.2 SATA SSD as a ...
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1answer
52 views

RAID 1 Reliability: 4 drives vs 2 Drives + 2 Spare Drives

Which is likely to be more reliable (safer data + lower downtime): having 4 drives in RAID 1 OR having 2 drives in RAID 1 plus 2 spare(s)? In other words, is there an advantage in having spares when ...
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1answer
59 views

RAID1 to store ~10 million files <3MB? [closed]

I have many small files in all of my websites, which are backed up every day to local computer. Today I use external 2TB HDD, but due to lack of free space wanna buy additional HDD. So my goal is not ...
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182 views

Recover data from RAID1 single disk only

root@rescue:~# fdisk -l Device Boot Start End Sectors Size Id Type /dev/sda1 69632 102713344 102643713 49G 83 Linux /dev/sda2 102782976 467808255 365025280 174.1G ...
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If two members of a RAID 1 volume have inconsistent bits, how do most RAID controller handle this?

I am using VROC for CPU RAID with some NVMe drives. I have a RAID 1 array that seems to be having problems. Instead of boring you with the details, I have a more general question. How does VROC (or ...
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1k views

How to add hot spare to software RAID1?

I have a CentOS 7 server. It is running a software RAID 1 mirroring three disks. I want to add a 4th disk to act as a hot spare. My intention is that in the event of a failure of one of the three ...
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1answer
371 views

Create RAID 5 with 2 new and 2 data disks without losing data [closed]

I would like to create a RAID 5 for my file storage. For that purpose, I currently use 2 drives without any RAID configuration. I would like to upgrade to a RAID 5. I want to add 2 new (and empty) ...
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161 views

While RAID1 is resyncing after create, can i write files to it immediately?

I searched but i just found this. How to interrupt software raid resync? My question is can i write files to my raid1 device while... [root@centos ~]# cat /proc/mdstat Personalities : [raid1] ...
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2answers
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Huge data loss in RAID 1 array [closed]

I've recently faced a huge data loss (everything from last 5 months) after one of my disk crashed, even if the RAID array is still fine. This disk was a SSD with my root partition (ext4), mirrored in ...
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1answer
30 views

raid1 will not work when I physically remove “removed” disk in Ubuntu 18.04

/dev/sdc1 and /dev/sdd1 is raided (RAID1) into /dev/md3. /dev/md3 is encrypted with luksSetup. Last night I got DegradedArray events for /dev/sdc1. I shutdown the system, physically removed the disk,...
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1answer
2k views

Faulty RAID1 disk now shows as foreign

I have a Dell R320 that has two physical drives in a RAID1 array. The RAID controller is a PERC H310 Mini. During routine maintenance I discovered that one of them was showing as faulty. I had to ...
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484 views

Replacing RAID 1 with larger drives - professional standards

I work with one of the biggest hosting companies on the planet. I got a dedicated server with hardware RAID 1 and two SAS 15k disks. I asked my hosting company if they could replace SAS with much ...
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535 views

LSI MegaRAID Storage Manager - Delete primary array

Situation: server contains two RAID-1 arrays; one primary for OS and one secondary for data. My question is: If I delete primary array with command /opt/MegaRAID/storcli/storcli64 /c# /v# del what ...
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545 views

How to recover unrecoverable errors in a btrfs RAID1 volume?

I have a 10TB BTRFS volume made of 7 whole-disk volumes (no partitions) in a JBOD server with each volume being a physical drive mounted as single-drive RAID0*. The BTRFS volume with the 7 drives was ...

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