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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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Cheapest solution for mass (and slow) storage on a Linux-like system? [closed]

I would like find the cheapest solution for a data retrieval system, which could be cheapest per TB. And the system is OK to be very slow. Basically, I want to connect as many hard drives (TeraBytes) ...
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Coping with bad sectors on RAID disk

I have a RAID 1 of 2 hard drives managed with mdadm. Today, one of them failed. I figured out that this is because of bad sectors in /dev/sdb. According to badblocks, these sectors are affected: 1028, ...
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Cannot add partition back to RAID 1

I run an mdadm RAID 1 on my Raspberry Pi. The USB cables to the two hard disks (especially to /dev/sda) seem to provide somewhat loose connections or someone touches them. They are right next to the ...
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Correct layout of RAID and LVM

What is correct (better) option: 1) encrypt RAID 5 and create LVM on encrypted partition 2) encrypt RAID 5 and create LVM on RAID 5 3) encrypt LVM created on RAID 5 And if I have some of 1)2)3) ...
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28 views

Monitoring raid status

I have installed MegaCLI on a centos 6 server and trying to monitor the raid status. When I run megacli -PDList -Aall this is the result: [root@da435 MegaCli]# megacli -PDList -Aall ...
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How to externally copy an old UFS hard drive?

Here at work our machines are required to run off of old Sun Sparc5's (1995) all running a UFS architecture on the hard drives due to a Solaris 5.3ish base. The way they are configured it is not ...
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109 views

BTRFS Raid 1 vs. MDADM Raid 1

I'm currently in the process of setting up a NAS system mainly for backing up my computer and probably also for streaming media files to my devices. For these purposes, I decided to use ...
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Need to understand the solaris command for the RAID 0

I'm looking at the below command that was listed in the Oracle KB. Example 9-1 Creating a RAID–0 (Stripe) Volume of Three Slices # metainit d20 1 3 c0t1d0s2 c0t2d0s2 c0t3d0s2 d20: Concat/Stripe is ...
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How to set timeout for the systemd start job “dev-md125.device” (mdadm)

I've setup a RAID1 device with mdadm on CentOS 7. The system boots fine when both disks are inserted but hangs when there is only one. The error occurs at boot with the following message from systemd:...
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Is it possible to simulate two different hard drives in oracle virtualbox?

I want to implement RAID 1(disk mirroring) in the Oracle virtual box using Linux/Unix distribution. Is it possible to do it without buying the extra hard drive and do it on my laptop?
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Mounting a RAID-0 pair of M.2 drives from older PC

My laptop uses two M.2 drives in RAID 0 as the main drive. This was stock configuration (an Acer Predator GX-792 laptop). I reformatted and installed Ubuntu 14.04 on it (using ext3 file system) with ...
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I cannot mount a RAID 10 partition

A week ago one of my 4 RAID10 disks (4Tb each in a FANTEC QB-35US3R box) died. I changed it and the RAID 10 seems to work (from a hardware point of view). But although I can see dirs and files using ...
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ZFS on mdadm: Implications?

I am considering setting up a RAID array with mdadm/Linux RAID, and using the ZFS filesystem on the resulting device (ie. /dev/md0). Many would suggest using ZFS to create the RAID array directly, ...
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73 views

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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Error message on raid boot - “Either the required RAID not set or more options required”

I'm configuring a RAID system for a Centos 6.9 install, and it seems to be working ok. But I noticed this error on the boot log: Activate Software (ATA)Raid: ERROR: Either the required RAID not set ...
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48 views

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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New RAID controller from LSI/AVAGO MegaRAID SAS 9361-16i on my Linux

I have a new RAID controller from LSI/AVAGO MegaRAID SAS 9361-16i on my Linux server installed as hardware. I booted with LiveCD and installed the latest Firmware for this controller. After that I ...
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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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How to see write speed with iostat?

I am trying to monitor disk i/o in CentOS 7. Using iostat I can see accurate numbers for sdb, which is my boot drive. But for sda I can only see read speed. Write speed always shows zero. sdb is a ...
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Adaptec RAID logical device reporting bad stripes, What to do?

I have a massive storage machine with an Adaptec RAID Controller card. One array reported failed stripes so I do a litle bit of search and found the following link After reading the link, this is ...
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How to boot after removing one disk from encrypted software RAID? [closed]

I have installed encrypted software RAID 1 on ubuntu server: After installing I got ubuntu successfully booted up. Then I tried to remove one drive, after that boot failed: Why I cant boot if its ...
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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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MDRAID refusing to reassemble RAID1 disk — claims no superblock on either disk

I've got a pair of 5TB disks, both known good, set up as a mirrored set. Every time the server reboots, MD fails to reassemble the RAID. Using mdadm --assemble says there's no superblock on the ...
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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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24 views

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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raid 0 restore boot

Looks like my system will not boot next time: [root@master /]# fdisk -l WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion. Disk /dev/sda:...
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1answer
159 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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106 views

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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203 views

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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322 views

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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149 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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170 views

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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394 views

Software RAID can't assemble because drive is busy

I had an error on a software RAID. After changing a disk, I can't assemble the array because mdadm says: mdadm: /dev/sdb3 is busy - skipping. # --force doesn't change a thing # mdadm --assemble /dev/...
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151 views

Different SSD and HDD sizes on Linux

I have read this - partitioning using 2 hard disks (SSD and non-SSD) in linux and other related questions. I configured a local file/web server using Fedora with default LVM settings on a 500G SSD, ...
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1answer
635 views

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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Make disks “Online” for raid array build with MegaCli

I installed two new disks on my server. Im trying to create a virtual drive of type raid1. Actually when i list my drives those two appear as "Unconfigured(good), Spun up". I wanna make them "Online" ...
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1answer
186 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
51 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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Can I check hardware status on a CentOS HP8 server from CLI?

I was wondering if there is a way to check our G8 server’s hardware raid status from the CLI. In person there is a nifty light that shows any errors. Ideally I would be able to set a monitor to ...
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164 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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1answer
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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
148 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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3answers
424 views

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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400 views

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 ...