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Questions tagged [software-raid]

RAID solution handled by the operating system.

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CentOS: What steps are needed to move my entire server (OS/boot/storage) from one mdadm raid 1 array to a new one?

I have a pair of large nVME drives in my CentOS 8 Stream server, configured in mdadm raid 1. I wish to install a pair of smaller (cheaper) nVME drives, move everything across, and then remove the ...
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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 ...
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Are affordable hardware raids with BBU still worth it?

We have done a lot of research and got conflicting answers from experts. What is your opinion on the following? 14 x 16 TB HDDs (Raid 10 -> 100 TB usable) HW: SGL 8405 + AEC-82885T + BBU (...
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Grub on RAID1, keep from failing on next update?

I have /boot/ on /dev/md0, with two partitions: /dev/sda1 /dev/sdb1 I had a problem when running apt upgrade because I had to replace sdb and the new drive wasn't in the grub config. I got things ...
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Software RAID Options Combining Internal SATA & External USB?

BACKGROUND I currently use a hybrid server-workstation setup for my primary workstation. Basically, just a Fedora base running Linux KVM, on which I then containerize a couple Linux flavors & a ...
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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 ...
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Soft-raid with Windows Server (Redundancy on OS)

We lease bare-metal servers on OVH. We use Windows Server 2022 as OS on the servers. OVH offers soft-raid for all of their servers. They do not offer hardware raid. While it's generally possible to do ...
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LVM with uneven proportional "stripe" distribution over 2 disks of different sizes

Is there a way to create a "striped" LV in a VG with 2 disks of different sizes in such a way it utilizes 100% of the available space? Linear LV would work, but I want to have the load ...
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mdstat mismatch cnt unsynchronized blocks

Both of our servers suffer from mdstat mismatch cnt unsynchronized blocks Every start of the month we got this error and we have to repair the raid using echo 'repair' >/sys/block/<md id>/md/...
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Boot manager shows two entries but only one partition remains after restore

I had to perform a recovery (using veeam recovery agent) on a windows 2019 server instance. Before the recovery the system was configured as software raid (mirroring) with two dynamic disks. After the ...
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recovering lost access to RAID5

I had perfectly working RAID5 and added another device. I lost power during the RAID recovery. Now I have no access to it - it does not exist - lsblk does no longer recognize it as RAID5 - just ...
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Partition RAID or multiple RAIDs per partitions

I'm trying to setup a RAID 1 with two HDDs. This is what I'm trying to achieve: data partition (ext4) Mac TimeMachine backup partition (HFS+) I want to have RAID over both partitions, but I still ...
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How to partition disks in Debian 10 installer for RAID5 on UEFI machine?

Installing Debian 10. I have 3 disks I want to use as RAID5 on a UEFI machine. I have tried several configurations that either led to failure to install grub or failure to boot (stuck in grub-rescue ...
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ProLiant DL320e Gen8 v2 cannot see disk on SAS ports, SATA port 5 (for dvd-drive) works fine

First post on this forum, thanks for reading. Trying to get my server up and running with a RAID0 array on the built in software RAID controller HP Dynamic Smart Array B120i v3.54. The system does see ...
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Attempting to create an RAID array in Ubuntu server 20.10

I'm attempting to create a RAID 0 RAID array on Ubuntu server 21.10, but I keep getting the following error: mdadm: An option must be given to set the mode before a second device Here is the syntax I ...
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Does Linux md-raid store backup metadata anywhere on the disk?

I know that with ext2/3/4 and other filesystems, copies of the superblock are stored throughout the disk in case the primary superblock is corrupted (https://ext4.wiki.kernel.org/index.php/...
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Openmediavault assemble raid6 with mdadm

I have a raid 6 with 1 hot spare. I the initial config was with 5 6TB drives then I added 2 more 6TB drives with the openmediavault web interface. Everything was fine after that. But the last time ...
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Properly Boot a Software-Based RAID1 with a Missing or Improperly Failed Drive

tl;dr. Is there a way to properly boot a software-based RAID1 with a missing or failed drive (that wasn't failed by the user first)? To be clear, booting a software-based RAID1 without a hard drive ...
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Can RAID 5 be made, when one or more of the disk is actually RAID 0?

I have this question since (I think) 3 years ago, but since I was never actually planning to build server, I just shrug it off. But tonight, I literally can't sleep because of this burning question. ...
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How to configure notification on degraded RAID? [closed]

I am planning a RAID1(mirror) array in a NAS using either a Hardware or Software RAID controller using Linux. Though I did not find any documentation in which way the system will notify me that the ...
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How can I migrate soft RAID array made by mdadm to new server and new OS?

I have a RAID array which level is raid0 and made by mdadm, in my old server. The member of this array is 6 NVMe SSD, and I create this array with below command: sudo mdadm -C /dev/md0 -l 0 -n 6 /dev/...
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Raid 5 disk replace Centos6

I have centos 6.6 with a 4 disk raid 5. One disk is bad. I removed the bad disk by serial number (it was sdc1). When i rebooted with a new disk the sd labels changed. My new disk is now sdb. Mdadm ...
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RAID10 software raid converted as RAID0

On one of the server, The RAID10 software raid volume had became RAID0 after one the disks in the RAID10 disk group failed. Also the converted RAID0 volume has become inactive. How can we recover the ...
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RAID 10 not showing full capacity

I am currently in the process of trying to setup a software raid using mdadm on my linux machine. My system has 4x 8TB (all are exact same model) which I would like to put into a RAID 10. However, ...
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mdadm - cant read superblock - can I zero the superblocks without erasing data and recreate a raid?

Today I had to fix a Server Fan by disassembling and rebuild it. After booting the server I had the problem that all disks where not at the same location they have been yesterday. So the system ...
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3 votes
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Linux mdraid resync speed on 36 drive array

I have some performance issue with mdraid. I have one 18x10TB soft raid6 array that is resyncing at ~70MB/s: kernel 5.8.13-1.el8 /dev/md0: Version : 1.2 Creation Time : Mon Oct 5 15:...
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How do I measure the read/write speed of a hard drive in a RAID5 array?

I have created a 3-drive Linux RAID5 (md) array out of brand new Seagate Barracuda drives. I can measure the performance of the whole array by using: ioping -s 8k -c 10 -D -W ., where the current ...
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RAID5 array is rebuilding after a fresh install of Ubuntu 20.04 Server

I installed Ubuntu 20.04 Server on a system with three Seagate 6TB drives. I have partitioned both sda and sdb in two partitions. The first partition on each disk is of 5G. I combined those two 5G ...
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How to change size of RAID0 software array by resizing partition?

I've RAID 0 built with mdadm on two disk partition on two separate disks. Is it possible to resize (enlarge) this array by resizing the underlying partition, i.e. do something like stop array->...
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Spin up all raid drives at the same time

Here is the configuration: 4 HDDs in a RAID-5 array (mdadm) hdparm spin_down_time set for all disks Debian jessie 8.11 When the drives are in standby mode and the RAID array is requested, they wake ...
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Is it possible to "undo" a raid1 configuration

How can I reconfigure a raid1 so that it is not raid1 anymore and without loss of data? I do not want raid. I find myself with a server with predefined images that have a software raid1 setup. My ...
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3 votes
1 answer
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What is the source of syslog message "Condition check resulted in MD array scrubbing"

On an Ubuntu 20.04.2 server with a software MD raid, exactly once a day when the system is doing its daily activities, the following message is output to the syslog: systemd[1]: Condition check ...
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2 votes
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Debian/Linux weird mdraid state

Why is md1 state UU, md0 is U_ and md2 is _U? nvme1n1 is broken here. Can I safely replace nvme1n1 now? You can see md2 state, nvme0n1p3 seems removed but nvme1n1p3 seems active. How can I safely ...
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Restore files from software RAID 1

I accidentally erased my files from my MDADM raid when I created a Docker container and mapped my raid but after that all files in the raid disappeared. The discs are not currently being written or ...
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Raid-10 mdadm - How to Manually Configure Mirrored Drive Order?

How do I configure a new mdadm software RAID-10 to use a specific order for its drive mirroring? Say I have 4 hard drives: A, B, C, and D. For my own reliability and performance reasons, I want drive ...
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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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Single-disk array full: how to add a spare disk without losing data?

So I rent this server from Hetzner and it was labeled as 2x512gb nvme ssd. Indeed, the server contains two 512 gb nvme ssd but (my fault) I noticed only later that they were in some sort of software ...
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Grow mdadm raid from raid1 to raid0 with active lvm

We rented a server with two NVMe disks in a raid1 configuration with a lvm on top of that. Is it possible to change the raid level to raid0 without making any changes to the lvm config? We don't need ...
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High avgqu-sz & utilisation on madadm RAID 0 in AWS EC2 I3.8x large instance

I have an AWS EC2 i3.8xlarge with 4x1.9TB ephemeral storage volumes tied in mdadm RAID-0 (Yes, RAID 0) with XFS file system mounted using noatime and inode64 options. I am running an IO intensive ...
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I accidently deleted the partition tables of my RAID6 drives

I accidentally deleted the partition table of 2 drives in my 4 drive RAID6 by reversing the order of sudo sgdisk -R=/dev/sdb /dev/sdz parted /dev/sdb print currently reports: Model: ATA ST2000DM008-...
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desperate attempt to head off RAID 0 failure, can i copy a disk with dd?

A colleague has been using a 10TB RAID 0 array to edit a film. He suddenly realized it's 98% full. The array has started seriously acting up, but cooperates grudgingly if you shut down all processes ...
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How is RAID3/4 is implemented for more than 4 drives?

I understand that, RAID 3/4 for 4 drives is: Parity Drive = D1 XOR D2 XOR D3. But what is there 5 drives or more? For example 5 or 6. How many parity drives is needed, and how XOR algorithm is working ...
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BTRFS and coping with disk failure

I'm finding the information for this quite difficult to come by, but it seems like an important feature of a RAID system: what happens immediately after a disk fails for BTRFS? For my hardware RAID ...
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What is the safest RAID Type for maintain the system?

What is safest RAID Configuration to maintain the system without data loss? If you have 6 X 8TB Disk On RAID 10 it has 24TB usage spaces and 1 disk failure reserve and on RAID 6 it has 2 Disk failure ...
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2 votes
1 answer
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How can I know if one disk faults on RAID 5?

I have 4 x 8TB configured on RAID 5, as it is if one disk faults the system can survive. But if more than 1 disk faults, the system will be destructed. How can I check if one disk is already faulted ...
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Raid 5 is brocken after replace a disk

My server mailed me that one of my disks failed to read a block. So I decide to replace it before it failed completely. I added a new disk and replace the failing one. sudo mdadm --manage /dev/md0 --...
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1 answer
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Cache writes on a RAID to SSD and only do one daily commit to HDD

I have a Debian 10.7 server at home with 3x8TB disks in a mdraid5 setup, kept with hd-idle at a 600s spindown time to reduce power usage. The only thing using the disks is a Samba server, which serves ...
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1 vote
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Moving raid array from USB to SATA

I have a raid 1 array of two 2TB drives which I set up a while ago, both of them were connected through a sata->usb adapter (external HDD cases). Now I moved them into a proper PC but mdadm does ...
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Converting a RAID 1 drive to a regular one and booting off of it

I'm using mdadm to manage a RAID 1 array with three disks. Would it be possible to take a single drive from the array (i.e. /dev/sdc), turning it into a regular drive, and then booting another PC off ...
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Advantages of partitioning RAID HDs?

I have a bunch of identical, brand new HDs (4*3T, if it matters) I need to use for a single RAID5 array (Linux mdmadm). It is still undecided if I'll use the entire combined content for a single ...
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