Questions tagged [raid]

RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

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linux “mdadm --write-journal” and lvmcache - how do they relate?

In linux mdadm man page I saw the option "--write-journal". How does this relate to lvmcache as lvmcache is built on top of dm-cache? Are they different things or does lvmcache do something like "--...
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lvmcache and ext4 data=journal => overkill?

We are running lvmcache (24TB raid5 hdd data, 64GB raid1 ssd cache+meta) and we are using external journal with data=journal for the ext4 fs on that raid5 and have the journal on the same ssd raid1 (...
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Is it possible to create raid-0 without losing data?

My linux root OS device is /dev/sda, and my external hard drive is /dev/sdb (empty drive) I don't want to loss data on /dev/sda, and setup raid level 0. Is this possible?
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Mirror Linux disk writes to secondary disk [duplicate]

I would like to set up a Linux system to use one primary storage device, but copy all writes to that device to another secondary device without blocking for every write - e.g. an NVMe SSD as primary ...
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1answer
491 views

mdadm raid10 recovery - is this filesystem corrupted? Is it fixable?

Background: I had an Ubuntu Bionic system set up and running using 3x1tb disks. The disks were all partitioned with one circa 15gb partition and the remaining circa 983gb. 15gb partitions from two ...
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577 views

mdadm, invalid RAID level?

I'm trying to create RAID 5 according to this tutorial. But, when I run mdadm -C /dev/md0 -l=5 -n=4 /dev/sd[b-e]1, I get this error: mdadm: invalid raid level: =5 Here's the output of mdadm -E /dev/...
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Can I enlarge a RAID partition?

I have an OpenSUSE 42.3 system with a RAID5 (mdadm) made out of four discs (2 2TB and 2 3TB). I'm growing the RAID by replacing the 2TB discs with larger ones. The 3TB discs have only 2TB partitions ...
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How To Remount Raid 1 Array After OS Disk Failed [duplicate]

Have a workstation that has an SSD for the boot drive (Linux Mint) and (software) Raid 1 array for data storage. The SSD died, and I've replaced it and reinstalled Mint. How do I get the OS to ...
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782 views

RAIDs disappearing on reboot (Centos 7.5)

I'm trying to create 4 RAID 0 disk arrays on my system running Centos 7.5 and have the RAIDs automount after a reboot. For some reason, only one of the RAIDs /dev/md0 is persistent between boots. The ...
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USB boot install Linux not recognizing disk space

There seem to be similar questions here, here and here but with no confirmed answer, and no answer that addresses my situation satisfactorily. Update: I've deleted Windows and reset BIOS factory ...
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Convert btrfs RAID10 to RAID0

So, I started getting filesystem errors on my 4-drive btrfs RAID10 array, and btrfsck is unsuccessful in repairing them (goes into an infinite loop producing the same output for days on end). The ...
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Hard disk info behind hardware RAID controller?

If I run smartctl -i /dev/sdb I get correct disk information including serial number and drive model number. But this is for a disk marked as JBOD. For n drives that are RAID'ed (using an LSI RAID ...
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Unable to assemble existing RAID array with mdadm

I originally set up a RAID1 array on Windows with RST (not as a bootable disk). I recently started moving everything to xubuntu, so I tried mdadm on my xubuntu partition (dual boot). Installing and ...
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1answer
725 views

mdadm raid 1 how to remove raid and remove data offset to mount normally?

I have a disk that was in a mdadm raid1 with a btrfs partition. Now I want to use this partition without the raid stuff and mount it normally. I already zeroed the mdadm superblock, but now the ...
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Moving drives currently in software raid to LVM? [duplicate]

I have 3 drives currently set up in RAID 5 via mdadm. I just realized that I goofed and forgot to format them with LVM- is it possible to do this after RAID array creation without losing data?
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Extract a string that is located above and nearest to the matching pattern in a multiline output

Below is the HP ssacli command to see configured hardware RAID details: ssacli ctrl slot=0 show config and its output is as below: HPE Smart Array P408i-a SR Gen10 in Slot 0 (Embedded) Internal ...
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CentOS 7, RAID-1, and degraded performance with SSDs

I am preparing PCs built with 64GB RAM on the Gigabyte AORUS X299-GAMING-3 motherboard, ordered for Cent OS 7 use, with RAID-1 on a pair of Intel 545 Series SSDSC2KW512G8X1 SSDs. The configuration is ...
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(Complicated) RAID hard drive issue

I have a (complicated) RAID hard drive issue: I have a Synology DS413j with 4 hds, hd 3 failed so I decided to replace them. The official support article says to replace them one by one, and being ...
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577 views

High IO load by [md0_raid1]

I'm experiencing a 99% IO load caused by [md0_raid1] process every 20-30 seconds. That 99% IO is very short-term, about 1-2 seconds, but it causes lag for other processes due to io wait (it's very ...
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1answer
96 views

How to determine if a controller is true hardraid or fakeraid?

I've just bought a new SAS/SATA controller (Highpoint RocketRAID RR2720SGL) and it looks like it is hardware raid, but I've no idea how to tell if it is true hardware raid or yet another fakeraid ...
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547 views

Mounting an RAID under Debian

I see the disk with lsblk, but in the output of df -h. How do I mount the disks? If I remember correctly it is an ext4 stripe. I tried mount /dev/sda /folder, it says unknown filesystem type '...
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How to replace a disk mounted to a specific folder without losing the stored data

Disk 1 is mounted to /storage, it is 99% full and I am out of spare connectors. What I want to do is replace Disk 1 with a bigger drive (Disk 2) in a way that the new larger disk will contain the same ...
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2answers
834 views

How can I identify who is writing to NFS server and where are these writes coming from?

Our CentOS6 NFS export is near 100% capacity. We've turned off NFS for now and are trying to move data around. I temporarily turned it back on with logging on and was surprised to see data roaring ...
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Backup mdadm configuration does not work

I backup my raid50 with mdadm --detail --scan --verbose >> /etc/mdadm.conf. Output of mdadm --detail --scan --verbose is: ARRAY /dev/md1 level=raid5 num-devices=3 metadata=1.2 name=1 UUID=...
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Understanding LVM2 behavior in case of disk failure?

I have a LVM2 group using the following command for a 5x4TB set up: pvcreate /dev/sd{b,c,d,e,f} vgcreate vg0 /dev/sd{b,c,d,e,f} lvcreate -l 100%FREE -n lvol1 vg0 Now that I created this monster, I ...
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Create Software RAID 1 - unexpected failure opening /dev/md0

I want to create a Software RAID 1 on my Debian. Unfortunately when I execute sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 it returns me mdadm: unexpected ...
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259 views

CentOS trying to mount non existant RAID array -> recovery mode

My first try using RAID1 ended with CentOS not starting anymore - throwing me into Recovery mode. Luckily a test system At first i set-up the raid1 which worked rather good. Later i noticed that my ...
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Can I use one physical disk in two mdadm arrays?

I have three disks that I'd like to use in a RAID setup; 2x4 TB 1x8 TB Can I create two partitions on the 8 TB disk and include in two RAID 1 arrays with the 4 TB disks? RAID 1 array 1: 4 TB ...
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537 views

Problem mounting and reading hard disk

I am trying to read the content of a 1Tb external disk. The device was part of an external nas (dlink 320) using raid 1. when I plug the hard disk using the usb port no partition is mounted. The ...
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How to partition a software RAID

I want to create a second partition on a software RAID 5 created on debian stretch. To create it I used mdadm --create /dev/md0 --auto md --level=5 --raid-devices=4 /dev/sda1 /dev/sdc1 /dev/sdd1 /dev/...
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238 views

How do I work out what's trashing my RAID?

I have an x86_64 Ubuntu 17.10 install (stock 4.13 kernel) with an SSD and three 1TB WD HDDs which each have a 750GB partition that's used in a 1.45TB RAID5 array. The SSD has my / on it, and the RAID ...
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Home NAS: Best setup to ease data recovery in case of hardware failure? Should I get rid of HW raid 1?

I'm not quite sure how to formulate the question here. I built myself a low energy NAS with an Intel N4200 with 8GB RAM. For the hard drives I'm using two WD red in a Raidon GR3660-B3 which is running ...
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What is best parition format and raid setup for millions of small files? [closed]

If I have millions of small files distributed by folders, what would be the best parition format and what raid setup in order to manage them as fast as possible ? E.g search in all files, find files ...
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991 views

Deconfigure RAID1 and mount the second hard drive in Debian

The dedicated server running on Debian has two 512 SSDs, both part of a single RAID1 disk array. There are many guides for that without losing any data on the disk but could not find the complete one ...
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Identifying if RAID is used or not

I have a Linux server, and when I want to see its hard disk size, I use this command: df -h But in fact, I know, my server consists of some hard disks and its original disk space is more than that. ...
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1answer
37 views

Get rpm installation order (Areca hw bus reset)

We have a standard configuration for all of our machines. Installation is via a script which installs approx 800 packages over a minimum Centos 6 install. This has worked fine for 5 years already. ...
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39 views

Raid partitioning - how do I add a new partition?

I have a raid 1 setup already. Its 4tb. I want to split that into 4 partitions - boot, swap, home, and root. Normally you just use fdisk. This can't be used anymore because of complexities of raid ...
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807 views

Recovering a RAID 6

I'm attempting to recover a 7 Drive RAID6 array from a failed Thecus NAS. I've been able to get the drives and access to the data through an Ubuntu machine I setup, the problem being that the transfer ...
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1answer
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SMBus/IPMI/GenericSerialBus write requires Buffer of length 66, found length 32

today my nas debian 9 based started to write out this error in the startup phase, the same is reported in red by calling journalctl -xe: ACPI Error: SMBus/IPMI/Generic write requires Buffer of length ...
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464 views

How to dm-crypt the data only once by filesystem level RAID?

I'd like to use dm-crypt with btrfs, because of the bitrot protection of this filesystem. What I am worrying about that the RADI1 is on the filesystem level above the dm-crypt, so if I write a file, ...
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510 views

How to recover/copy data off disks that were once part of a RAID1 (LVM on MD) in a 2-disk NAS?

I have got a 2-disk NAS configured by the builtin software to be a RAID1 array. On this were two volumes (LVM on MD) with data. Now I replaced the two disks and wish to copy over the old data. I have ...
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608 views

Error setting up Raid 1 with mdadm at RaspberryPi 2

I was setting up a RAID 1 with mdadm at my RaspberryPi with two drives (both 2 TB and formatted with exFAT, both with independent power supplies), but I ran into an error. Unfortunately I am not an ...
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UUID in fstab + in which cases we must not configured UUID in fstab

discussion - we have redhat linux machines and my question is about the UUID configuration in /etc/fstab file , and in which cases UUID risk the OS as I understand we MUST NOT use UUID in /etc/...
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mdadm RAID5 3*3TB, 1 Drive with data

I have one disk (sdd) on which I currently have stored my data. I now have got two new 3TB disks (sdb&sdc) and want to create a RAID5 array over all three disks. sdb: gpt table, empty partition ...
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How to create a RAID device with specifying a size ?

I want to Create a RAID 0 array using the two partitions /dev/sda2 & /dev/sda3 (They are both of size 3G each) The properties of the array is the following: 1. SIZE = 2048MB 2. Label=RAID_0 3. ...
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4answers
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Linux raid disappears after reboot

My troubleshooting ability in Linux is not impressive, just so you know. I can follow instructions very well on the other hand. I have a Linux server with Linux raid. It was working well with no ...
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218 views

linux + tool that can identify RAID configuration [duplicate]

I am searching for a long time tool that can runs as CLI on linux machine and identify which RAID configuration is defined on the disk or disks ( according to the list from lsblk ) the reason for ...
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1answer
139 views

how to identify if raid1 or raid mirror configure on OS disk

we want to verify if raid1 is configured on out linux machine so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1 but from the output - ...
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in which cases it will be problematic to configure UUID in fstab

We are thinking about to change all Linux fstab configuration to work with UUID instead the current configuration Some of the disks are with non RAID and some of the disks are with RAID10 I searched ...
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Trouble recovering multiple RAIDs with mdadm

Background I had a 3.0TB die on me recently and it was in a linux raid in a Synology NAS with RAID 1 redundancy. I recently bought two 8.0TB drives and I wanted to backup the 3.0TB but my synology ...

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