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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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ZFS Mirror over one large disk and a RAID0 of two small disks

You have: two disks of size X and one of size 2X. You want: zpool with mirror-like redundancy of size 2X Concatenation of the two X drives is straightforward with ZFS. But I found no way to mirror ...
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Snap RAID and LVM

I have multiple physical disks of different sizes that I wish to create one large pool of storage space on. The purpose of this large pool of space is to store a large encrypted file which is too ...
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How do I store one large file over multiple hard disks?

I have setup my Linux box with Snap RAID and MergerFS which gives me the impression of having one large pool of space. The problem is I can't store a single large file that will span multiple hard ...
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converting a StoreMI Windows Fake Raid to a linux raid

I am unable to open a raid made by StoreMI on Windows but on Linux the two drives are shown as ddf_raid_member. Can I convert or use to mount the two drives or seperate without using Windows? Note: ...
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Disk utilization on mdadm raid 5 is 100% even though none of the member disks is at 100%

I am currently confused about the disk utilisation of one of my machines. The setup: I have a machine containing 4 2TB HDDs. For those HDDs I used mdadm to configure a RAID 5 (called md2) On MD2, I ...
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2answers
46 views

SSD's hard resetting link CentOS 7

I have two Intel SSDSC2CW120A3 SSDs in a SuperMicro X9SCL/X9SCM set for software RAID-1 on CentOS 7: Linux hostname.local 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 ...
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Use mdraid to restore a volume after a NAS server wipeout

I own a NAS, which I'm trying to upgrade by installing - most likely - Debian Stretch on it. In itself that's a relatively straightforward task, but there's one thing I'm a bit uncertain about. My NAS ...
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30 views

MDADM can't automount existing RAID1 array

I recently reformatted my system and cannot get my RAID 1 array to load on boot. Would appreciate some help figuring out why this is. Using ubuntu 14 with MDADM. Its a very simple RAID1 array ...
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22 views

Linux RAID hard drives

I've a drive that's part of a single disk RAID 1 array, it's a 2Tb Western Digital WD20EFRX-68EUZN0 (/dev/sdd). It's working fine, but I'm trying to set up another disk to join the array. The first ...
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68 views

Reducing disks from a RAID5 mdadm with LVM

Checking a system, I found a server with 12 4TB drives in Raid5, with LVM on top. Single VG, single PV, and a few LGs that wouldn't need more than 6TB of space (currently only 4TB). Read speed is no ...
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Using a LVM Raid0 as a LVM Cache for / on Linux Mint

I have a pair of solid state drives (/dev/sda and /dev/sdc) and a hard drive (/dev/sdb). I would like to install the system to the hard drive, collect the SSD's into a Raid-0, and divide up that Raid-...
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101 views

Why does BTRFS filesystem mount automatically?

So I've made a btrfs filesystem that spans across one logical drive (md1) and a USB drive. its all raid 0. so that: sata\ md1--\ sata/ \ btrfs called "Storage" usb-------...
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Debian Buster: mount raid 0 with no superblocks on boot

I have a OCZ RevoDrive, which is a PCIe SSD that actually consists of some butchered Marvell raid controller with two disks attached to it. As a result, the RevoDrive shows up as two disks [ 8....
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2answers
71 views

CentOS cannot see logical RAID volume

I am trying to install CentOS on a server with an HP Smart Array E200i storage controller. There are eight 67GiB drives that I joined into a RAID 10 273GiB volume. The pre-OS storage management ...
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1answer
145 views

Debian mdadm: No devices listed in conf file were found

My Debian sid machine had been booting kernel 4.13 from a raid array for several months without issue. 2 days ago I upgraded the platform and now booting fails like this: Additionally, the initramfs ...
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1answer
160 views

Ubuntu 18.04 VM in emergency/maintenance mode due to failed corrupted raided disk

I have a VM which has an attached raided device with fstab entry: /dev/md127 /mnt/blah ext4 nofail 0 2 The raided disks are corrupted and during startup the unit entered emergency/maintence mode, ...
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1answer
324 views

SW RAID-1 grub-install

I just changed /sda system disk in SW RAID using following steps, simply put: sfdisk -d /dev/sdb | sfdisk /dev/sda mdadm --manage /dev/md0 --add /dev/sda2 Now disk is initializing chcked by: cat /...
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1answer
50 views

Shrink one RAID-1 partition and grow another

I have a dedicated server with /dev/md2 being mounted on / with 2 TB and /dev/md3 being mounted on /home with 3.5 TB. Now I want to shrink /dev/md2 to 500 GB and grow /dev/md3 to about 5 TB. How do I ...
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88 views

Backup: How to mirror/clone LVM LVs (or VGs) on demand?

So far, I have a semi-automated backup approach for the whole system installed in different LVs, using LVM (CoW) snapshots (which can be created upon boot to avoid data corruption). That is, if I ...
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58 views

mdadm - are there any downsides of mixing 512 B and 4 kB logical sector size disks in RAID 1 or RAID 5/6?

I have a mdadm RAID 1 and RAID 6 setup with 8 TB disks which are using 4 kB physical sector size but 512 B logical sector size. I want to add more 8 TB disks to these arrays and the way I usually do ...
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433 views

Failed GPU passthrough using Unraid 6.6.6

A while ago, I have build a new Ryzen setup. I am currently experimenting with Unraid 6.6.6 and trying to setup my daily Ubuntu VM with a passed through GTX 1060 from Inno3D. Unfortunately, I get ...
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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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1answer
121 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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3answers
824 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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1answer
99 views

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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1answer
47 views

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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66 views

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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1answer
203 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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1answer
212 views

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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1answer
250 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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1answer
43 views

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
113 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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31 views

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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54 views

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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1answer
210 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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1answer
71 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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1answer
375 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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3answers
1k views

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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1answer
212 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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2answers
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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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725 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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1answer
323 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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1answer
253 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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1answer
41 views

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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1answer
2k 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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118 views

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" ...