Questions tagged [raid1]

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

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How to restore RAID1 configuration with 2 different HardDrives in CentOS-7

We have a server (HP ProLiant ML10 Gen 9) that came with Two Identical Hard disks. It was assumed that the server supports hardware RAID 1 (Mirror), and the CentOS-7 was installed in it. But later we ...
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1answer
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Changing RAID1 HDDs (Dell PowerEdge R430) to another identical server

I'm new with server configuration and infrastructure. If I have two identical servers (PowerEdge R430), one for spare without HDDs  (call it S1), and another online with the HDDs (S2). If I remove the ...
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PCI NVMe mdadm RAID1 performance too slow

I know this has been discussed multiple times but I have not found any solution so far that worked so posting here hoping there is some solutions in Dec 2021… I have a Dell R640 server with dual Xeon ...
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Adaptec 8405E RAID 1 extremely slow expansion (1% per day)

Our RAID 1 is being expanded from 4 TB to 8 TB. The GUI status looks like this: The progress happens by about 1% per day. At the same time, the server is quite slow. This seems like an extremely slow ...
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1answer
35 views

SAS Drive Upgrade [closed]

We have a HP Proliant server with a RAID 1 disk ( 2x 146Gb 15K SAS) configuration. The logical drive is full and I would like to expand it. I've purchased 2 x 300GB 15K SAS to replace the 146K ...
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60 views

RAID1 Recovery after Degradation

Below is the output from lsblk, mdadm and /proc/mdstat for my 2 disk Raid1 array anand@ironman:~$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 ...
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1answer
214 views

How to create LVM RAID 1 with 4 disks of 2 different sizes?

I have a system with 2 x 1TB (NVMe SSDs) 2 x 2TB (SATA SSDs) disks and would like to create a RAID 1 system using all available disks (so I have a 3TB RAID1 system at the end). Unfortunately, most ...
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Remove missing sub-LVs from LVM2 raid1 array

I have a two drive LVM2 RAID1 array where I've handled two HDD failures. It still works now, but when I examine my logical volume I can see it contains sub LVs for the physical volumes that are no ...
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Recovering a file by mounting a Synology RAID1 disk in Ubuntu (mount, mdadm, and losetup issues)

I'm working with a Synology RAID1 system and deleted a file that wasn't yet backed up. To recover the file, and since an undelete approach seems to be impossible, my idea is to mount a single RAID1 ...
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Windows-Server-2019 - Raid 1 Software - Could not convert Disk to Dynamic security enabled on Disk

I installed a fresh Windows Server 2019 on ONE of two identical Crucial CT1000MX500SSD1M. I don't have an integrated RAID controller on my MB ASUS_H110m-A/M.2 so I wanted to try a software RAID 1, ...
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Not able to create RAID 1 on Fujitsu Server after ransomware infection

I have a FUJITSU Server PRIMERGY TX1310 M3, whose hard drives was infected with ransomware. There are 2 1TB HDDs, which were configured into RAID 1 and working properly. After the infection I am not ...
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HP DL380G6 disks reuse to another array

I have a DL380G6 with p410i controller (windows OS). HDD Config is: SAS Array A - 1 logical drive, RAID 5 SAS Array B - 1 logical drive, RAID 1 (2 x 450GB HDD) SAS Array C - 1 logical drive, RAID 1 (...
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1answer
74 views

Does Software RAID-1 Double The Writes Over The Controller/Interface?

Say I have two hard drives that max at 200 MBytes/sec writes per hard drive. Now let's say both drives are in a USB enclosure that maxes at 300 MBytes/sec writes for the entire enclosure. When ...
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Running CentOS 7.8 with RAID / and regular Boot drive to RAID 1

I am moving a regular hard drive to RAID 1 array. Many things I could complete referring to the thread here. First of all a big thank you to the community. This is my boot drive. Partition type is GPT ...
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5answers
238 views

Raid 1 default disk capacity is lesser than the disk sizes. Any ideas? Intel Raid Storage Technology - Raid from Bios

Here the screenshots I think they explains everything The disks are advertised as 1 TB and the real size of the disks are 931.5 GB I have installed windows server without raid setup for ...
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RAID1 clean, degrade

after a fire in my hosting, i finally recovered access to my Debian 9 server. I can enter in recovery mode but i can't run the server in normal (HDD) mode. If i run /cat/mdstat i have 4 RAID 1 entries:...
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Recovering data from a single-disk raid1 array [closed]

I had an idea of a Raspberry Pi file server using multiple external disk drives in a RAID array. For starters I only had a single 1TB disk so I setup a raid1 array on that disk with the intent on ...
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1answer
47 views

Reusing a disk which was in the RAID array

My DC has added a new hard disk. It appears as md124 inactive sdc1. When I try to mount, the error is unknown filesystem type 'linux_raid_member', I need to use this disk for backup VM. Can I just do ...
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Identify HDD failure by sound + Is it safe to run smartctl on a mounted RAID1?

Basically, I have two WD HDDs in a programmatic RAID1 (no special hardware): $ lsscsi --verbose [0:0:0:0] disk ATA WDC WD10EFRX-68F 0A82 /dev/sda dir: /sys/bus/scsi/devices/0:0:0:0 [/...
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1answer
47 views

RAID1 array always degraded when rebooted after changing SATA controller

My software RAID1 arrays (/boot, /) always become degraded when restarted after adding SATA controller. It's CentOS 7. Here is what happening and what had been done: I made 4-disks RAID1 arrays with ...
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29 views

Windows 2019 RAID 1 Storage Pool not working

I have a 2TB RAID 1 disk on my home-based Windows 2019 Server. This has been used now for at least 5 years for storing data for my company. In the last couple of days, it suddenly started dropping off....
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1answer
86 views

How does Linux MD software RAID avoid assembling old and new devices into the same array?

On a Linux MD software RAID1 I removed a failed drive and added a new one. (All fine now.) The old drive and the new were never in the system at the same time. Do I see that right, that adding the old ...
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1answer
115 views

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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1answer
142 views

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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1answer
108 views

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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1answer
2k 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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1answer
39 views

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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5answers
898 views

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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1answer
408 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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1answer
115 views

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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0answers
995 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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1answer
276 views

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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2answers
426 views

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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1answer
153 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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4answers
439 views

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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1answer
2k 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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139 views

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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1answer
46 views

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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120 views

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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1answer
431 views

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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1answer
28 views

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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1answer
101 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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1answer
360 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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1answer
175 views

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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1answer
38 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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1answer
442 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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108 views

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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1answer
767 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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2answers
57 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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4answers
249 views

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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