Skip to main content
Share Your Experience: Take the 2024 Developer Survey

Questions tagged [raid1]

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

Filter by
Sorted by
Tagged with
0 votes
1 answer
69 views

Reassemble BTRFS RAID1 array (was created by mkfs.btrfs)

I've got RAID1 array (4 HDD) from old dead system. Need to reassemble that RAID1 array on a new system. Old and dead linux system was installed to one separate HDD (which is unrecoverable dead) and ...
sinoptic's user avatar
  • 101
0 votes
0 answers
59 views

Trying to recover mdadm RAID1

I have a RAID1 array that I wanted to split into two individual drives. /dev/sdb and /dev/sdc were the two drives and there were three individual partitions. /dev/sd[bc]1 /dev/md0 /dev/sd[bc]2 /dev/...
Jpirok's user avatar
  • 1
3 votes
2 answers
130 views

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
  • 131
0 votes
0 answers
48 views

Resizing RAID-1 devices after dd clone

I had 2 x 250 GB disks with 3 md devices - raid 1 setup on them. One of them is for /. I dd-cloned those disks to another 2 x 2 TB SSDs. What is the best solution to increase the raid device sizes? &...
ServerMan's user avatar
0 votes
1 answer
56 views

Partition unreachable in a HDD which was part of a RAID 1 cluster

I am out of options here because of my lack of knowledge and I seriously need a hand in order to get my data back. Yes, I did the mistake of trusting RAID system too much... Here is what happened: One ...
AlEmerich's user avatar
  • 103
0 votes
0 answers
14 views

how to mark LVM raid1 PV as in-sync [duplicate]

I am recovering from bad sectors on both sides of my LVM raid setup. (It's the backup server, dammit). I have new disks and a new install. I could wipe the backup partition and suck 1TB of data ...
mcr's user avatar
  • 233
0 votes
0 answers
37 views

how to mark LVM raid1 PV as in-sync

I am recovering from bad sectors on both sides of my LVM raid setup. (It's the backup server, dammit). I have new disks and a new install. I could wipe the backup partition and suck 1TB of data ...
mcr's user avatar
  • 233
1 vote
0 answers
42 views

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
  • 111
0 votes
0 answers
77 views

storcli - not able to import raid array

I have a set of 2 disk drives which were configured into a Raid 1 array and working fine. I set them offline and removed them for offline storage. When I insert them they originally show as UBAD and I ...
user1204270's user avatar
0 votes
0 answers
38 views

RAID1 array auto removed a totally physically damaged member disk. Should the disk replacement procedure be any different than standard `mdadm --add`?

RAID Setup One RAID 1 array with 2 members: sda1 sdb1 Due to hardware failure, sda is not visible in /dev/ anymore and the array also does include it anymore (RAID 1 status: S) Playbook to replace ...
David Andreoletti's user avatar
0 votes
0 answers
120 views

Ubuntu 20.04 - How to remove software RAID 1

How can I safely turn of software RAID 1 and make sure systems uses only one of the drives, like let's say sda. Here is some info: df -h Filesystem Size Used Avail Use% Mounted on udev ...
Venelin Vasilev's user avatar
1 vote
0 answers
367 views

Trying to set up RAID 1 array on existing AlmaLinux OS disk running LVM, get 'partition exists' warning

I am following instructions from here for setting up a RAID1 on an existing Linux installation. The instructions are for a Debian/Ubuntu installation, but I can't find any specifically for AlmaLinux, ...
jamminjames's user avatar
0 votes
0 answers
102 views

Mount raid1 drive failed, drive is busy or partition not found

I have the same issue as this question a few years ago mount: unknown filesystem type 'linux_raid_member'. I want to mount a drive coming from a raid 1 array. I followed the steps but mdadm --...
Yann's user avatar
  • 25
1 vote
1 answer
103 views

RAID1 drive vanished, but could be re-added after reboot. Should I be worried?

I am running Debian 12 with an MD RAID1 array (2 drives) for my personal data (no system files on array). Today I got a mail from mdadm about a DegradedArray event, during a time where my drives are ...
HighDraw'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
  • 127
0 votes
0 answers
137 views

megacli is scratching my head

I recently bought an old Dell server from a colleague, he has a PERC H310 mini with four drives. In this type of things (hardware, raid, disks) I am a newbie and I don't understand more than what I ...
Javier Valencia's user avatar
0 votes
1 answer
53 views

mdadm raid1 showing removed disk

I have a dedicated server which consists of two hard drives with 5 partitions each. NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS sda 8:0 0 1.8T 0 disk ├─sda1 8:1 0 1M 0 part ...
ProfGhost's user avatar
  • 145
10 votes
2 answers
2k views

RAID configuration on new server

I need help with the configuration of RAIDs on the ASUS RS720-E10-RS12 server. We have installed 2x 512GB NVME drives in the motherboard slots and 12x SATA SSDs in the Backplane slots. I can only ...
demon420's user avatar
  • 101
1 vote
1 answer
485 views

pvmove: "Insufficient free space" when trying to move mirrored LV

Originally I had two PVs /dev/nvme0n1p2 and /dev/nvme1n1p1 containing various mirrored LVs. I recently added two new larger capacity PVs /dev/nvme2n1p1 and /dev/nvme3n1p1, and expanded a LV (home/...
小太郎's user avatar
  • 347
0 votes
2 answers
72 views

Do mounted folders get mirrored with RAID1?

I have two drives configured for RAID1 on a a centos 7.9 server. I have been running out of space, installed a third drive and relocated the /opt folder to this third drive. I still seem to be ...
stackQA's user avatar
  • 101
0 votes
0 answers
142 views

How to replace old drives in RAID 1 using WebBIOS?

Working with Sun Fire X4170 Server. Now it have three RAIDs, all is on level 1. Every logical volume (every RAID) contains one Proxmox VM, idk does it matter in my case. The first RAID recognizes that ...
Everblane's user avatar
0 votes
0 answers
147 views

setup Raid1 on running system

I have 2 disk sda and sdb with several partition. I have to make a raid1 of the running system. I managed to setup raid1 with md0 on root but there are 2 more partition which are mounted on /home and /...
codelearner1029's user avatar
8 votes
3 answers
3k views

Can I build a RAID 5+1 system?

I must say I already found a similar question on this platform, but the context was different, so I'm trying by myself. My idea is as follows: I have 4 disks, 3 of them are the same capacity, and the ...
Ancool's user avatar
  • 93
3 votes
2 answers
1k views

Is it possible to recover data from an Intel PERC H710 Adapter RAID Controller disks into another server with SAS controller

I have a Dell T420 server with a PERC H710 Adapter RAID Controller. I had a RAID 1 with two hard drives. And another disk into the same controller, with no RAID only for backup. The Motherboard of ...
Olver Hernández Navarro's user avatar
0 votes
1 answer
180 views

After disk reinstallation 2 disks in RAID1 became foreign // PowerEdge r720

I'm a newbie in DELL servers, so need your advice. First of all, we have PowerEdge r720 with 4 HDDs, two 2TB SAS with RAID 1 and two SAS 1TB in RAID 1 too. After the 1 of the HDD was plugged out and ...
d.pustovoitov's user avatar
0 votes
1 answer
234 views

RAID1 M.2 SSD (2 Drives) | 1 Failed, I removed and Replaced with a new one, but its state stays "removed"

I have a Ubuntu Server RAID1 M.2 SSD (2 Drives) where 1 Failed, I removed and Replaced with a new one, but its state stays "removed". I am new to RAID Stuff, Below are my RAID Details: cat /...
tj0xin's user avatar
  • 1
0 votes
2 answers
188 views

Problems converting a raid1 to raid5

I had a clean raid1 which I tried to convert to a raid5 following this procedure: https://dev.to/csgeek/converting-raid-1-to-raid-5-on-linux-file-systems-k73 After the step: mdadm --create /dev/md0 --...
Moritz's user avatar
  • 1
-1 votes
1 answer
69 views

Can a SATA hard disk be removed from bay w/o shutting down after being marked 'failed' in RAID1 array?

We have a software RAID1 array set up in a Supermicro 1u server. Can a SATA hard disk be removed (in a bay drive setup) w/o shutting down the machine? This would be after marking it 'failed' in the ...
jamminjames's user avatar
0 votes
1 answer
962 views

Best way to clone a single disk from a Software RAID1 Array in Linux server

How can I clone a single HDD bootable disk from a Software RAID1 Array in Linux server? It is currently a two-disk HDD mirror array. I have physical access to the server, and it has empty bays for ...
jamminjames's user avatar
3 votes
2 answers
4k views

Possible to start a RAID1 setup with a single drive?

Can I start a ZFS pool with a RAID1 setup using a single drive, and then add another one later? Running Proxmox VE 7.2
luisschwab's user avatar
2 votes
0 answers
133 views

Transferring RAID1 to a new motherboard after HDD failure, and no "Superblock" found

First an OS SDD failure followed by a mobo failure, new mobo/cpu/ram later, and I have a RAID1 with a single working disk, and I am trying to get it remounted so that I can add in a new replacement ...
Aslan French's user avatar
-1 votes
1 answer
38 views

Lost RAID 1 on 3ware controller. Good drive booted up with old data [closed]

Server is running Windows 2008R2. Drive failed and reported degraded, but restarted and OS loaded. The good drive is a copy from 5/2021 almost 8 months ago. Is it possible the drive stopped copying ...
Joe Rocksford's user avatar
-1 votes
1 answer
335 views

I would like to understand RAID 1 restore

So, I have a situation here and I'd like to hear some tips about it. I have a Windows Server 2012 R2 and I'm going to upgrade it to Windows 2019. The server has two HDD's in RAID 1. To be on the safe ...
cicerosf's user avatar
1 vote
1 answer
360 views

Erratic SMART readings on one member of a RAID 1 array

I am managing a server that uses 2 nvme ssds on RAID 1 connectivity. At once point I lost access to one of the 2 and got my normal raid array degraded mails from mdadm. So I asked from the hosting ...
escozul's user avatar
  • 11
0 votes
0 answers
159 views

Debian Software Raid1 boot failure after trying to change one disk

I have a server running Debian 11 with 3 HDDs, each 500gb using software RAID1. I'm now in the process of upgrading so I have 2x1TB drives. To accomplish this I followed this guide. The disk I removed ...
Jonathan's user avatar
  • 111
1 vote
1 answer
58 views

mdadm using double disk space

My mdadm raid1 2 disks array seems to work good. It is a 2 500GB array, shared over samba as proxmox bkup disk serving 2 nodes. By the way, even if the size of the sum of the files is actually about ...
Nik Rubblers's user avatar
1 vote
1 answer
1k views

Creating a RAID 1 via mdadm ends with completely filled one of drives after sync

I have a server with 2x 1TB NVMe drives and I want them to work in software RAID 1 (mdadm) as a system drive. After creating and waiting for sync of the array I'm ending with one of the drives in ...
janopano12's user avatar
14 votes
1 answer
3k views

When adding a new disk to RAID 1, why does it sync unused space?

I recently set up RAID 1 on Linux with mdadm. When adding a new HDD to RAID 1, data started to sync between my drives which is expected. I didn't expect that it started syncing the entire drive, ...
idunnololz's user avatar
0 votes
1 answer
1k views

mdadm raid1 irregular degraded without reason

My raid1 went to degrade state from time to time. Then my application crashes, because the raid is in read-only mode. After a reboot the raid is working fine again. Now I want to find out whats the ...
Mark's user avatar
  • 13
2 votes
1 answer
3k views

Weekly RAID check affecting my system - any way to mitigate?

I recently got my webhost (Hetzner) to add a paid of 16TB SATA drives to my webserver. Currently using 2.5TB of them. They're RAID 1 mirrored. I also have two 4TB nVME drives with 700GB currently on ...
Codemonkey's user avatar
  • 1,148
0 votes
1 answer
214 views

Is it best to have the OS on a separate virtual disk?

I have a server with 8 drive bays, and I have eight 4TB drives. Would it be best to do one RAID10 with all drives, or one RAID1 with two drives and then a RAID10 with the remaining six so that the ...
Kyle Souza's user avatar
1 vote
1 answer
388 views

Synology SHR Volume - Migrate from 3 disks (RAID5-ish) volume into 2 new disks (RAID1-ish)

What I have: 3 x 6TB SHR Volume with 12 TB redundant storage (1 disk recently broken) What I want: 2 x 18TB SHR volume with 18 TB redundant storage (I'll expand the volume after the migration) Of ...
Esben von Buchwald's user avatar
2 votes
2 answers
87 views

RAID Recommendation Request: 2x RAID5 arrays, 1 Large RAID5, RAID10?

I just ordered a new PowerEdge R650 which will be the primary server for our company. It will run HyperV with 10 - 12 virtuals on it, mostly Windows but some Ubuntu. All the standards: domain ...
ADY's user avatar
  • 93
2 votes
0 answers
128 views

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 ...
Surya H's user avatar
  • 21
0 votes
1 answer
211 views

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 ...
Suurune's user avatar
1 vote
0 answers
2k views

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 ...
JackFrost's user avatar
1 vote
0 answers
137 views

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 ...
boot4life's user avatar
  • 289
0 votes
1 answer
144 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 ...
yvalcorp's user avatar
0 votes
1 answer
514 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 ...
newbie's user avatar
  • 103
3 votes
1 answer
2k 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 ...
Hendrik's user avatar
  • 133

1
2 3 4 5
11