Questions tagged [raid1]

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

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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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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 an inner 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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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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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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62 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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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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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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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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68 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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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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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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creating lvm2 raid1 with missing drive

I want to create a lvm2 raid1 using a single hdd and adding the mirror hdd later. Using mdadm I can do this with the following command: mdadm --create /dev/md0 -R --auto md --level=1 --raid-devices=2 ...
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118 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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1answer
359 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
169 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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63 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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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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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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264 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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360 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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434 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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Boot failing to complete after resizing RAID 1 with GParted

So I have the following setup in Ubuntu 18.04: /dev/md0: / (ext4) /dev/md1: swap /dev/md2: /var/lib (ext4) I needed to free a couple of GB space after /dev/md2, so I decided to live boot using ...
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519 views

Add btrfs devices to raid1 array, increasing total size

I have a btrfs array comprising of two 2TB disks in raid 1. I am running out of space, and I want to add two 3TB disks that I have lying around. The final setup will be 2x2TB+2x3TB drives. One drive ...
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How to resize linux partition with RAID1?

I have a Proxmox disk with 130Gb LVM image. I moved it to 235Gb disk. And resized in the Proxmox. Done. But in my Linux distro, the partition still 130Gb (disk become 235Gb). The partitions: /dev/...
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902 views

Amazon AWS Ephemeral disks and RAID1

Some AWS instances have "ephemeral disks" attached, which are much faster than EBS. But ephemeral disks will be blank and uninitialised when your instance is stopped and started. The data on disk ...
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1answer
790 views

Can ZFS mirror a single disk pool automatically? [closed]

I'm getting ready to add another server to my home network. I currently have one storage drive for it. I want to add another one to mirror the first drive, but can't purchase the second drive for a ...
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106 views

Less painful way to resize/rearrange RAID1 backwards with mdadm

Got the following scenario in a two-disk RAID1 (mdadm) Debian-based server (no LVM involved): Partitions (same for mirror /dev/sdb): Unassigned space (formerly /dev/sda1 with Windows). /dev/sda2 ...
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parted and fdisk not showing new size after expanding a RAID 1 volume (Proxmox/Debian)

Background: I need to extend a RAID 1 volume from a live Proxmox/Debian server that has a LSI SAS 2108 MegaRAID card, from 1TB to 2TB, I did this on a test environment albeit it was with a different ...
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793 views

HP Smart Array P410: Convert RAID10 to RAID1 OR remove disks from RAID10

I have a server with two RAID10 arrays of 146GB disks. I'm trying to replace one RAID10 array of 146GB disks with RAID1 of two 2TB disks. Since there are no free ports, I took out two disks from the ...
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Low-end hardware RAID vs Software RAID [closed]

I want to build a low-end 6TB RAID 1 archive, on an old pc. MB: Intel d2500hn 64bit CPU: Intel Atom D2500 RAM: 4GB DDR3 533 MHz PSU: Chinese 500W NO GPU 1x Ethernet 1Gbps 2x SATA2 ports 1x PCI port ...
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4answers
729 views

Raid 1 with 3 disks of different sizes

I'm new to this site. I am currently configuring a server, which has these ssd disks: 1X1TB SSD NVme 2X512GB SSD NVMe Now I would like to create a raid 1 between these disks, in which I would always ...
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68 views

RAID 5 to 2x RAID 1

Is it possible to convert RAID 5 to 2x RAID 1 without any data loss? Example: 3x 1TB HD in RAID 5 + 1x 1TB like Hot Spare convert to 2x 1TB RAID 1 + 2x 1TB RAID 1
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MegaCLI RAID1 - Can't Replace Missing Disk

I have a RAID1 where I've replaced a disk with errors, however it will not automatically or allow me to manually replace the "missing" disk with the new one. Here are the physical disks per my ...
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1answer
1k views

“Symbol 'grub_efi_secure_boot' not found” after disk replacement on boot (CentOS 7.5, RAID1)

Recently I had to replace a faulty HD at a Centos 7.5 server with RAID1 (2 x Samsung NVMe disks) After disk replacement, server booted using the other drive, I copied the same partitions at the new ...
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556 views

Persistent multiple medium errors on LSI RAID array

One of our SuperMicro servers with an onboard LSI 2308 RAID controller has been having issues with our main RAID10 array consisting of 4 Seagate 600 PRO SSD drives (in slots 0,1,2,3). It started with ...
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558 views

How to recover data - from Software RAID1 - MBR is lost on both drives

I'm trying to recover raid1 array, both disks are NVMe flash drives. I did really stupid thing in the end of long and bad day - erased first 512 bytes of each NVMe drive - the intention was to ...
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242 views

Recover RAID 1 after unclean unmount

I have two drives in my desktop in RAID 1. My computer locked up on me yesterday, so I used SysRq REISUB for a "safe" restart. When the machine booted back up, I realized there was no data on my RAID ...
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One drive failed in my RAID 1 array, am I safe to replace it without losing data?

We have a server with three disks. Two of them are in RAID 1 defined in BIOS. One of these is showing an error at the bootup screen with the corresponding disk serial code in red. I intend to replace ...
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3answers
2k views

Replacing a drive in a mirrored set (RAID1), how does it know which is “primary”?

Let's say I have a RAID 1 array with two mirrored drives. One goes bad. If I order a spare online and just put it in, the hardware controller will rebuild the array, right? How does it know which ...
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1answer
27 views

Any way to make an hex dump of a SAS drive behind a RAID1 (PERC H200) controller?

I have SAS drives in RAID1. The RAID1 is done by a PERC H200 card on a Dell PowerEdge T310. This card has four sockets: 0,1,2,3. The RAID1 uses slots 0 and 1. When inserting third disk in slot 2, ...
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130 views

How to create software raid on working ubuntu server with gpt?

i have this structure of hdd on my server: fdisk -l Disk /dev/sda: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / ...
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55 views

Do more mirrors in raid 1 reduce the likelihood of spit-brain failures?

I'm setting up a server, and my predecessor had a habit of setting up multiple RAID 1s with only 2 disks, which eventually resulted in split-brain situations which were difficult to recover from. ...
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2answers
308 views

Cloning multiple SATA drives using dd with the assistance of software RAID1

So, I clone lots of Windows-based NTFS drives from images each day and I'm halfway through a project that could potentially help me and others to speed up this process dramatically. I currently have ...

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