Questions tagged [raid]
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.
1,542
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How can I quickly copy a GPT partition scheme from one hard drive to another?
On a non GPT partition table I can do
sfdisk -d /dev/sda | sfdisk /dev/sdb.
But sfdisk doesn't support GPT partition tables. What can I use instead?
I'm looking for a one or two command solution, ...
44
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4
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How do I install GRUB on a RAID system installation?
I'm trying to setup and install Ubuntu on a RAID 1 setup. I have two disks, sdb and sdc. I've been following this guide
https://help.ubuntu.com/community/Installation/SoftwareRAID
which more or less ...
42
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1
answer
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Workaround to Install Ubuntu 20.04 with Intel RST systems
I tried to install Ubuntu 20.04 in my Dell G5 which has 2 drives. One with Windows 10 on it (256 GB) and another one with 1 TB capacity.
I shrunk the volume of 1 TB by 150 GB and tried to install ...
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3
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The initramfs will attempt to resume from /dev/dm-1
I'm setting up a new Ubuntu 18.04 server and have already played through one backup/restore loop. So the entire system has been restored from backup with a fresh RAID and LVM volumes.
Now recently, ...
30
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1
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Install dual boot ubuntu with windows 10 and RAID on
I have a dell XP’s 9560 laptop and I want to install an Ubuntu distribution alongside windows 10. I tried a lot so far to install it but I can’t see any partitions. I figured out that the problem is ...
29
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6
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How do I rename an mdadm raid array?
For some reason, when I try to rename an mdadm raid array to a textual name, the change doesn't take.
I tried the advice from this serverfault question, but to no avail.
~$ mdadm --version
mdadm - ...
27
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2
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How to install Ubuntu 14.04/16.04 64-bit with a dual-boot RAID 1 partition on an UEFI/GPT system?
Update: Question and answer below also applies to Ubuntu 16.04
I have a computer with dual SSDs and Win (7) pre-installed on another disk. The pre-installation uses (U)EFI/GPT boot. I want to install ...
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How can I use Kernel 3.19 in 14.04 now?
So I'm rebuilding my storage server. For stability, I want to use Ubuntu server 14.04 LTS as the OS. However, I'm planning to use Btrfs with RAID 5, and this has been greatly improved in kernel 3.19. ...
20
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4
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How do I align my partition table properly?
I am in the process of building my first RAID5 array. I've used mdadm to create the following set up:
root@bondigas:~# mdadm --detail /dev/md1
/dev/md1:
Version : 00.90
Creation Time : Wed ...
19
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3
answers
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How to Install Ubuntu 14.04 with RAID 1 using desktop installer?
Many people claim that it is impossible to install Ubuntu onto RAID 1 with the Desktop CD. Is this really true? If not, how can it be done?
17
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How do I know what physical drives/partitions are behind my /dev/mapper/isw_dghbbcaabe_RAID_Volume11?
This is a just upgraded Ubuntu 10.04.1 LTS machine.
The /dev/mapper/isw_dghbbcaabe_RAID_Volume11 is "new" to the upgrade but I don't know what physical drives/partitions are included in the "device".
...
17
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2
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RAID (mdadm) - What happens if drives are mismatched in size?
Question 1 - Before you answer with "it just takes the smaller disk", hear me out quick. My 3TB WD Reds come out to be 3001 GB in size. Let's say I set up a mirror via mdadm for sdb1 and sdc1 which ...
16
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How to access MD RAID via Live CD?
We are currently trying to run access the data on a server running a HP Ml110 G5 SATA raid controller, using the latest Ubuntu Live CD. We need to delete a few files to let the server boot into ...
16
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8
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How can I physically identify a single drive in a RAID array?
I have an external drive bay with 4 eSATA disks in it. My system has a 4-port eSATA card, as well as a pair of internal hardware RAID1 drives. The external drives are in software RAID1 pairs as /dev/...
16
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Setting up RAID 1 on 14.04 with an existing drive
I have a currently installed Seagate ST3000DM001 (about 90% full) and a new Seagate ST3000DM001 (blank). I would like to setup RAID 1 without losing the data on my currently installed drive.
If I ...
16
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4
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How to enable degraded RAID1 boot in 16.04LTS?
In previous ubuntu versions, adding BOOT_DEGRADED=true to /etc/initramfs-tools/conf.d/mdadm allowed the system to automatically boot when the root filesystem is on a degraded array. This no longer ...
15
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3
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How do I properly access Windows software RAID 0?
I am a new Ubuntu user with a fresh installation, and am eager to get started with it. However, all of my important data is on Windows software RAID 0 array, and I need it to stay there as I'm also ...
15
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2
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Should swap and RAID-1 mix?
I have a box with a small RAID-1 array being used for swap space. I only did this since I was setting up mirrors for every other partition in the system.
Today I read this question and it prompted ...
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How to install Ubuntu server with UEFI and RAID1 + LVM
I used to install my servers with LVM over software RAID1, and grub install on the MBR of both drives. Now I have an UEFI server, and the compatibility (BIOS) mode does not seem to work.
So I went ...
15
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2
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How to re-add accidentally removed hard drive in RAID5
I have a NAS on Ubuntu Server with 4 2TB hard drives in RAID 5. A couple of weeks ago, one of the hard drives died, but my RAID was working, although degraded. Luckily it was still under warranty and ...
14
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Is having the 'swap' partition at the 'beginning' better than at the 'end'?
I recently installed Ubuntu 11.04 onto a RAID0(stripe) device using the alternate installation disc and manually partitioned the HDs ext4 and swap partitions; during this process, I was reading in a ...
14
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2
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Install Ubuntu 18.04 desktop with RAID 1 and LVM on machine with UEFI BIOS
I have a machine with UEFI BIOS. I want to install Ubuntu 18.04, desktop version with RAID 1 (and LVM) so my system will continue to work even if one of the drives fail. I haven't found a HOWTO of how ...
14
votes
4
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Installing 12.04 server as a software RAID 1 mirror fails to boot
I'm installing a few new Ubuntu Server 12.04 LTS servers, and they have two 512 GB SSDs. I want them to use software RAID 1 mirroring, so I was following this document religiously step by step:
https:...
14
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3
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Put HDDs in standby after X minutes using hdparm doesn't work
I use Ubuntu 12.04 on a home server. There are 5 hard drives: one SSD with the OS and 4 HDDs (Samsung HD204UI) configured as a RAID5 using mdadm.
I don't need the RAID very often (say, about once per ...
14
votes
1
answer
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Software raid - mdadm - re-find my array
Description
Today I plugged in another hard drive and unplugged my raid drives to ensure when I wiped the drive, I would not accidentally pick the wrong drives.
Now that I have re-plugged in my ...
13
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1
answer
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convert a single drive btrfs disk into a RAID1 with a second disk
I am running btrfs 4.15.1 on a fresh ubuntu 18.04 server. I have a small hardrive which for / and a large disk for documents served to my colleagues in our office via samba. That data drive is used ...
13
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1
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RAID1 "conflicting device node" message on startup
I'm dual booting Win8.1 and Ubuntu 14.04 (Gnome Classic). I have RAID1 set up (on Asus Z87-A motherboard) with Win partition, Ubuntu partition, and NTFS partition for data.
On Ubuntu startup, I see ...
12
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4
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Install Ubuntu 20.04 Focal Fossa with RAID 1 on two devices
I would like to install Ubuntu 20.04 Focal Fossa on a machine with two hard disks using RAID 1.
Unfortunately it seems this doesn't work. If I use the "Create Software RAID (md)" option and select ...
11
votes
6
answers
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How do I automount a fake raid?
Hardware
Asus K8N4-E Deluxe Mobo
Sil 3114 fake raid, onboard
2 Seagate 250 gb hd, hosting my /home
A backup on a separate hard disk of /home
What I have so far
I've made the raid using the Sil 3114 ...
11
votes
1
answer
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How should a RAID partition be created and configured using parted?
For testing I want to create a mirrored (RAID 1) partition with a size of 1GB on /dev/sdb and /dev/sdc. When it comes to partitioning, I want to used parted, how should I create the partition I want ...
11
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4
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Ubuntu 12.04 installer does not see Windows already installed on my computer [closed]
When I just tried to install Ubuntu 12.4 alongside Windows 7 on my new "HP Pavilion 64k desktop with Windows 7" computer, Ubuntu said
this computer has no detected operating system
and someone ...
11
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1
answer
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How do you install Ubuntu on an Intel RST RAID-0?
I am attempting to install Ubuntu 16.04 to dual boot with Windows 10 on my new PC. I am using an MSI Z170A motherboard and two 512GB M.2 drives. My goal is to RAID-0 both drives, and split the single ...
10
votes
1
answer
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How can I create a RAID array with >2TB disks?
I would like to know the correct way to set up a software RAID array on an existing server. I have two brand new 3TB disks to use for the array.
Specifically, I want to set up a 3TB RAID 1 array, ...
10
votes
5
answers
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RAID array doesn't reassemble after reboot
RAID array doesn't assemble after reboot.
I have one SSD from which the system is booted, and three HDD that are part of the array. The system is Ubuntu 16.04.
The steps that I've followed are based ...
10
votes
2
answers
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Switching mdadm to an external bitmap
I've just read this in another post about improving RAID5/6 write speeds:
After increasing stripe cache & switching to external bitmap, my speeds are 160 Mb/s writes, 260 Mb/s reads. :-D
I've ...
10
votes
2
answers
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LVM2 builtin raid - how to check raid status
I just created LVM2 builtin RAID1 (something like lvm mirrir, but newer) with lvconvert --type raid1 -m1 /dev/ubuntu/root /dev/sdb5, Ubuntu 12.10.
How can I check mirror status/health both in command-...
10
votes
2
answers
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How to set up SSD raid and TRIM support?
I am looking to set up a new server. I can only use Intel 520 Series 240gb MLC ssds or standard Seagate 7200rpm disks.
These are the non negotiable options.
Naturally, as this is going to be running ...
10
votes
4
answers
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Well supported Hardware Raid Controller
I am currently planning to buy a hardware-raid controller. This became necessary since I am running Linux and Windows in parallel and now need the redundancy for both OS (Im am going to use RAID1 / ...
10
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1
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How do I improve my server disk performance
I have an HP Microserver running Ubuntu 10.04 LTS. It's a low power server with 5 internal drive bays. I use it to backup my remote servers, VPSs and local laptops over the network. I want to get the ...
9
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2
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Which is better for a home media server: zfs or btrfs or LVM/md? [closed]
I'm looking at building a new home server and would like a flexible filesystem. Both btrfs and zfs are interesting. I want to be able to do soft raid and have flexible solution allowing me to expand ...
9
votes
1
answer
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Unable to Mount RAID1 md0 - wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error
I've created a RAID 1 using mdadm as below however I am having problems mounting it...
sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
mdadm: /dev/sdb appears to ...
9
votes
3
answers
10k
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Create RAID array of image files
OK, so I've got three image files in /home/, and they each reside on different physical drives:
image1.img
image2.img
image3.img
Each image is the same size, and I want to put the images ...
9
votes
2
answers
5k
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Do I have to worry about "error: superfluous RAID member"?
When running update-grub on the newly installed Ubuntu 12.04 with an older software RAID (md), I get:
error: superfluous RAID member (5 found).
error: superfluous RAID member (5 found).
Generating ...
9
votes
1
answer
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Can I manage ZFS with Landscape and MAAS?
I have 5 different servers. I am very interested in installing ZFS across all of them. I also am interested in using JuJu, MAAS, and Landscape to automate the installation of ZFS, and the management ...
9
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2
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Is there a Linux software RAID that can be shared with a windows installation?
What are the options I've got when it comes to RAID and Windows?
9
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1
answer
5k
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How to stop disks from being automagically mounted on boot?
I have a btrfs filesystem RAIDed across several disks. The machine is connected via USB to an external hard-drive bay where three disks live.
In my fstab I have a mount entry for one of the disks ...
9
votes
0
answers
3k
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RAID Drive on Dell Perc H310 RAID controller not recognized
So, I recently bought a Dell Perc H310 RAID controller to put in a Fujitsu Esprimo P700 E85+ Computer running Ubuntu Server 18.04.1 LTS. The Motherboard seems to have no UEFI, just a BIOS. From a ...
8
votes
3
answers
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Ubuntu show wrong disk sizes, how to solve it?
I have a server with these characteristics:
CPU: Intel Core i7-2600
PLUSRAID Controller 4-Port SATA PCI-E - Adaptec 5405
One each, SATA SSD, 240 GB
Two each, SATA HDDs, 3.0 TB Enterprise
Two each, 8 ...
8
votes
2
answers
30k
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Improving mdadm RAID-6 write speed
I have a mdadm RAID-6 in my home server of 5x1Tb WD Green HDDs.
Read speed is more than enough - 268 Mb/s in dd.
But write speed is just 37.1 Mb/s.
(Both tested via dd on 48Gb file, RAM size is 1Gb, ...
8
votes
3
answers
28k
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Error unknown command hwmatch [closed]
I'm getting "unknown command hwmatch" message on each boot after I installed Ubuntu 16.04 following this steps: https://gist.github.com/umpirsky/6ee1f870e759815333c8 in order to setup RAID0.
Special ...