RAID stands for redundant array of independent disks, and allows for disks to be linked in various ways. Common RAID setups in Ubuntu are a hardware RAID, FakeRAID and software RAID.

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What is 'AHCI mode' - HP ProLiant MicroServer Gen8

I have just purchased this server and I would like to install Ubuntu Server on it. I would like to keep RAID support, although I'm currently only using one HDD which will have my files and OS on it. ...
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Pointers / advice on Ubuntu Server install on HP Gen 8 G1610T microserver

I've recently purchased an HPE Microserver G8 GP1610T, 120GB SSD drive and a couple of 2TB drives to build an Ubuntu based server with the OS on the SSD drive and two 2TB drives as mirrored (RAID1) ...
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50 views

kworker using all my IOs, Postgres slow

I have 2 SSDs set up in RAID 0 configuration with a single volume on them that I've been using without problems for 3 months straight to run a PostgreSQL database. Suddenly, today, the DB got really ...
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Server 14.04 Install Onto Software RAID1 Fails to Boot

New 14.04 server install onto host with 2 x 1 Tb drives, followed https://help.ubuntu.com/lts/serverguide/advanced-installation.html to setup a software RAID 1, end of install reboot and I get no ...
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27 views

ZFS zpool import in ubuntu taking very long after system crash and reinstall OS

Don't know if the events were related in any way: zpool set to automatically run scrub on crontab, most recent scrub completed a few days ago, 3 unrepairable errors on 3 files. I did not require ...
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Raid 0 drives are not detected during Ubuntu 15.10 installation on GT72S 6QE dominator pro G

I have GT72S dominator pro G, with 128+128 Gb RAID 0 configured SSDs. I have 1TB mechanical disc as well. Windows 10 on UEFI mode is already installed. Trying to dual boot ubuntu and w10. The problem ...
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How do I add a partition (specifically swap) to my raid0 laptop setup?

EDIT: yes, gparted was the (in hindsight obvious) answer I foolishly didn't create swap space when I installed Ubuntu alongside Windows on my Acer laptop with 2 SSDs preconfigured as raid0. Now I ...
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68 views

Help, cannot install Grub

I have a recent motherboard (GA-X79-UP4), and a couple of 3TB Seagate drives. Trying to install Ubuntu 15.10, in a RAID5 configuration. Using the server image, since the desktop one does not seem to ...
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Creating boot partitions on multiple disks

I'm trying to get some redundancy with RAID1 on my Ubuntu Server box. I've made some good progress using the install wizard but I'm stuck on the following: >> lsblk NAME MAJ:...
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What does this fstab configuration line mean?

I am trying to mount a RAID array on my computer, and I found a guide on the Internet that told me to add this file to /etc/fstab: /dev/md0 /mnt/raid/ext4 defaults 0 0 What does /dev/md0 and 0 0 ...
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Procedure for rebooting server with Soft RAID mdadm

I've just made a raid10 on my ubuntu 14.04 server, and i was wondering if there was any step too do if i would to shutdown/reboot my server. It a Software RAID with mdadm. Do i need to make a script ...
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Installing Steam games on a RAID 0 array

So I just put a few old drives in a RAID 0 using mdadm and it was originally just for STeam games, but when I hit install, I don't know how to make it download onto my RAID 0 array... So is there a ...
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75 views

mdadm raid 1 to raid 0 (or lvm…)

I currently have a machine with 2x3TB in software raid 1 (mdadm, Ubuntu 15.04). I would prefer to keep the data on the disks, but I can risk losing it. Are there any options to migrate without ...
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14 views

Convert software RAID fileserver from Windows to Ubuntu

I currently have a fileserver running on Windows 7 (it started as an old backup machine but has grown). It has 1 SSD for the OS, and 6 1TB HDDs, in 3 RAID 1 pairs. This was done via Windows' disk ...
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38 views

How do I recover my RAID 1 file system after formatting it?

I used mkfs.exfat /dev/md0p1 by mistake, and killed my RAID 1 instead of formatting a micro SD card. Very dumb, I know. How can I undo this colossal mistake? I'm reasonably confident that the two hard ...
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Ubuntu won't boot after install on software raid r

I have installed server v15.10 and created a software raid 5 array. After partitioning and setting the EFI system partition as bootable it does the install with no problems. When done it reboots and ...
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Is my mdadm command correct, should I check something else before entering it?

The question: Would someone please confirm that I have investigated the correct factors and am about to use the correct mdadm command before I do something that might damage the data in my currently-...
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Trying to mount old NAS hard drive - mount: Structure needs cleaning

I had a Western digital. The software was not working anymore, so I remove the hard drive. The HD is a Western Digital Caviar Green of 1 To I connect through a USB hard drive converter and..... root@...
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MDADM Existing RAID

I just swapped from Fedora 20 over to Ubuntu 14.04 LTS. I have a pair of drives that were setup using RAID 1 (mdadm) and working beautifully. The OS is on a third drive (SSD). The web is awash in ...
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22 views

Extend primary partition [duplicate]

In planning for the future, I've been trying to extend the total size of our primary partition running Ubuntu Server 14.04 (from 6TB to 15TB). It was setup as a virtual disk (PERC H730 RAID ...
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95 views

Issue setting up Samba on Ubuntu 15.10 - most likely a permissions issue

I'm trying to install Samba on Ubuntu 15.10. I've setup samba like I have on any other server but I'm having trouble with some sort of permissions issue. The share is visible but I cannot access the ...
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SoftRAID array not visible to apps on boot?

My / is located on a single SSD, but I also have a softraid for my apps, games, etc. Most notably, both my Steam library and my Dropbox folder are located on the raid array. Whenever I boot my system,...
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Moving from two hard drives to one, plus a RAID array. Will I have problems?

I currently have a setup with two filesystems, /dev/sda and /dev/sdb, each with one partition. I boot from /dev/sda1 and have my /home on /dev/sdb1. /dev/sda is a solid state drive and /dev/sdb is a ...
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LVM mirrored reads goes to one drive instead of both

I've set up LVM mirror on two HDDs. The mirror works (and even has proven it's efficiency when drives failed two times). The problem is that all read operations goes to only one HDD, I see it with ...
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Ubuntu MaaS 1.9 RAID1 boot from degraded

MaaS 1.9 came out with a new feature of creating raid arrays with mdadm. I would like to use this to create redundant boot disks of a server which has no hardware raid. MaaS only allows one boot ...
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26 views

Copying a Ubuntu installation from a single hard drive to BIOS RAID 0

I am trying to copy an existing Ubuntu installation on a 250GB drive to a BIOS created RAID 0 array with two 160GB drives. I've tried Clonezilla, but it doesn't seem to support BIOS RAID, as the two ...
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24 views

SSD Not part of Raid?

I was playing around with BTRFS calculator (link below). I have 2 2TB Drives and 1 3TB drive. I also have a 120GB SSD. I was thinking Raid 5 with the operating system loaded on the SSD. It said I ...
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44 views

Auto-mount flashcache'd drive (RAID array) on startup

I have recently created a RAID5 array with mdadm and cached it through SSD using flashcache. Everything works great, however I cannot make the drive to be mounted on system's startup: Every time a get ...
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29 views

RAID5 disappears after reboot

I am struggling with setting up RAID5 for my workstation running Ubuntu. Having read a plenty of guides and tutorials I managed to: create a RAID5 array from 3 disks in Intel RST ROM Utility setup ...
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72 views

SATA configuration mode RAID doesn't pick up SSD

I just got a laptop with Windows 10 on a 500gb SSD. I partitioned it in order to install Ubuntu. When I got to the Ubuntu installation screen, I couldn't pick up my SSD (it only picked up the HDD). In ...
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Recovering a healthy RAID disk from an Ubuntu server: mdadm no recogniseable superblock

I've had a series of different issues with recovering a RAID disk, ending with the error reported in the subject. Please skip the long story to come to the conclusions if you want. Long story: I ...
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RAID array shared between Windows and Ubuntu

I am booting both Windows 10 and Ubuntu 14.04 off their own dedicated SSDs. No problem. I have 3 2TB HDDs I would like to run in a RAID5 array which I can share between both operating systems. I ...
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Mount point [UUID] does not exist (Ubuntu 14.04 LTS)

I have an Ubuntu desktop with 1xSSD with the system installed (/dev/sda) and 4xHDDs running in softraid (/dev/md0, sd[b-e]). Currently whenever I power on my PC, Ubuntu initially fails to boot, saying:...
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MAAS 1.7.6: ProLiant DL360 Gen9 - HP Dynamic Smart Array B120i controller driver for Ubuntu 14.04 does not work when configured as RAID 1 device

We are having issues configuring two ProLiant DL360 Gen9 servers, which are configured in a RAID 1 and in UEFI mode. The installation gets stuck at 'booting under maas direction'. The servers have ...
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26 views

Nagios service not showing up in Web Gui

I have a Nagios install and am trying to add check_raid plug in. I have 3 custom cfg files that I added to nagios.cfg called custom-commands.cfg custom-servicegroups.cfg and custom-services.cfg. They ...
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mounting raid1 root partition after mdadm: create group disk not found

i seem to have this problem: https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1335642 though #4 is not working for me i can boot live system and with mdadmn --assemble --scan i was able to ...
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Trying to monitor a windows raid with Nagios on Ubuntu 15.10

Hello I am trying to get my Nagios install, which is working fine, to monitor a windows server with some raid disks. I have a nagios installation working but when I installed the nagios-plugins-...
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68 views

mdadm: partition is not a block device

I was trying to create a RAID 1 partition by running the command mdadm --create /dev/md0 --verbose --metadata=0.9 --raid-devices=2 --level=raid1 --run /dev/sdc1 missing. But mdadm's response was: ...
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mdadm raid superblocks gone after a power cycle and moving the array ?

Our RAID superblock issue has many of the same details as this We have not been so lucky to see the raid again to recover data and start over . What complicates our issue is this is a 24 disk ...
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What “cbaaacigei” means in /dev/mapper/isw_cbaaacigei_foobar?

After creating an Intel software raid with the command dmraid --format isw --create foobar --type 0 --disk /dev/sdb,/dev/sdc a RAID-set was created with the name isw_cbaaacigei_foobar After ...
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69 views

Ubuntu Autopilot MAAS RAID Question

I am about to start a small endeavour of setting up a small private test cloud and see one of the requirements being that each server requires 2 disks. All of my servers are currently configured ...
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60 views

How to restore mdadm raid 1 from one HDD

I had 2 HDD's as /dev/md0 where was simple RAID1(mirror) with one partition. First it was created /dev/md0 and then there was created Filesystem. Now I have only one HDD from this RAID and i want ...
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29 views

df and system report incorrect disk capacity of raid5 array

I have a new Adaptec 8405 sata raid controller and started with 3x WD Red 4TB drives giving me a 8TB array (or actually 7.3TB). I installed Ubuntu on a seperate 500GB WD Green and mounted the array ...
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How do I create a software raid on non system drives in Ubuntu 14.04?

The OS is installed on a standalone SSD, but I have 3x 1TB drives I want to configure in a RAID 5 for docs, applications, games, etc. How do I do this? I've searched Google but the only results I ...
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Create dualboot with existing Windows raid array by adding SSD

I currently have a 3-disk RAID 0 array with Windows 10 installed. The array is a hardware array via my MSI motherboard. I would like to add a new blank SSD drive with K/Ubuntu on it, and have that ...
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Add a RAID to existing setup

So let's say I have 3 drives. D1 = 120GB SSD with Ubuntu 14.04 on it D2 = 2TB NAS Drive D3 = 2TB NAS Drive If I have D1 already setup and running Ubuntu how could I add D2 and D3 as a RAID 1 array ...
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High CPU load, low core usage, (ECC) memory error in kernel

I am having a super weird behavior ... The CPU load of my computer goes through the roof (>4 on a 8core machine) but there is no process that is taking much CPU (see attached image) Though the 8 core ...
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ZFS with L2ARC use and reliability

I am planning/building an ubuntu server 15.10 which will primarily be used for a NAS. I opted for Ubuntu Server over the likes of FreeNas as in the future I'll be able to use other features and ...
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is this best partition for ubuntu server? [closed]

I have 250gb ssd, 6x 3tb hdd and 16gb memory. I partitioned ssd; 16gb swap, 30gb /, rest of /home raid 6 for hdd and no spare, no swap just ext4 /home I will use this server for store all my media ...
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xfs on raid0(mdadm) proper mounting

Reading manuals on howto tune xfs on raid is totally crazy. In my case I have raid0 of 2 disks with 512K chunk size. Physical disk block size is 4096 The correct su and sw should be su=512k and sw=2? ...