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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Why isn't md raid assembled after reboot?

I'm trying to get an Intel RAID setup. The problem I have is that after a reboot the raid is not available. These are the steps I go through to setup the Intel RAID using the mdadm command. I've ...
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Software Raid0 doesn't mount successfully in fstab

I have created a Raid0 and it works as I expect it. The the array file is created at /dev/md0. I want this to be mounted automatically by adding this line at the end of the /etc/fstab file : /dev/md0 ...
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Deleting contents of a disc

I need to completely delete the contents of the folder /data Obviously I launched rm-rf * but it's been running from a long time (I have many large files for a total of nearly 1 TB). Given that the ...
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498 views

Is the Alternate Ubuntu installer still required for LVM or Software RAID setup?

Over the past 5 years, I have been setting up Ubuntu servers using the Alternate installer. I need to provision a new server today, and I'm curious if the Alternate CD is still the only way to setup ...
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384 views

RAID array rebuilt no longer mounts — isw_ *randchars*_STRIPE changed

I have a RAID 5 system, ICH10R, on a eVGA classified x58 motherboard. The RAID failed because of an application failure in Windows 7 (dual boot) which forced a hard restart. I rebuilt the array ...
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127 views

RAID - Ubuntu vs. Gentoo [closed]

I'm migrating a PC working as file server from Gentoo to Ubuntu. Gentoo doesn't recognize the RAID by BIOS because apparently Gentoo connects with each and every individual hard drive directly. ...
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438 views

RAID (mdadm) - Flags necessary?

As I understand it, it's best practice to set the drive flags as "raid" before adding them to a mdadm raid array. Okay fine, but I also heard people say that they didn't do this and mdadm worked fine. ...
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How to make GRUB2 detect and boot Ubuntu on a RAID 1?

grub 2 is unable to detect /dev/md1 which is a raid 1 drive on my computer. When I press c in grub menu and run ls I get a list of all the drives but don't see md1 for booting Ubuntu which is on ...
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Installer Only Recognizes 801GB of a 3TB RAID1 Array

I've been searching as best I can for this precise problem, but the only place I found it exactly was here, and I don't think that the OP ever got an adequate answer. Most of the issues I've seen ...
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341 views

are there any issues creating a tmpfs mount when my root partition is a RAID5 array

I have a new Ubuntu 11 server install created per the wiki with the following partitions: md1 : active raid5 sdc5[2] sda5[0] sdb5[1] 1935813632 blocks super 1.2 level 5, 512k chunk, algorithm 2 ...
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Ubuntu Server “fakeraid” RAID5 installation [closed]

I'm trying to install Ubuntu 10.04 server edition on a computer with a RAID5 array. The array seems functional from the BIOS standpoint. The problem arises in the installation when it comes to ...
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Raid 6 on btrfs in Vivid

Hi I'm trying to make a Raid 6 on multiple drives in Ubuntu 15.04, Btrfs is already running on 4 in raid10 when I do sudo btrfs balance start -dconvert=raid6 -mconvert=raid6 /mnt/storage/ it ...
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Ubuntu 14.10 does trim SSD RAID 0 discs?

I've got Ubuntu 14.10 in a RAID 0 set up with 2 x Samsung Evo 840 SSD 256Mb, for performance reasons while acessing/modificating very large files. I've also got a schedule backup to another HDD for ...
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mount an mdadm raid 1 drive at boot

I was wondering if you guys could help. I am looking to mount my mdadm RAID 1 at boot. The drive location is /dev/md127 and I would like it to mount to /media/server at boot. It is formatted to ...
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Ubuntu Desktop 14 on PowerEdge doesn't boot on RAID

I have a Dell 1U PowerEdge 1950, and for some reason, we cannot install Ubuntu 14.04 64bit Desktop edition on it. I know what you're thinking... why are you installing desktop? I have asked the same ...
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301 views

What should I use my SSD for? [closed]

I am setting up a small (1 user) email server. So far I have put in 2 x 1TB WD Red drives and set them up for LVM with RAID1 mirrored LVs. I also picked up a 120GB Samsung 840 Evo but I can't figure ...
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129 views

How do I set up RAID 1 on only a portion of my HDDs, post Ubuntu 14.04 installation?

I'm trying to set up a mirrored (RAID 1) "file cabinet" consisting of the remainder of sda, after "/" and swap have been set up and Ubuntu installed, plus the equal amount of Gb space on sdb, ...
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12k views

How do I install the LSI megacli in Ubuntu?

Similar to this question (http://serverfault.com/questions/192394/megacli-always-returns-blank-output) with some differences. I am using perc h710p raid controller on Dell Ubuntu box. I downloaded ...
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824 views

How to force update-grub to use UUID?

When I run "update-grub", the file "grub.cfg" will contain lines like this. menuentry 'Ubuntu...' { ... linux /boot/vmlinuz... root=/dev/md124 ... ... } For the line of linux, is it ...
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Recovering a degraded RAID array

I was just given an external hard drive by a colleague, with the comment "Hey, you're running Ubuntu. Maybe you can recover some of the data from this really old disk that nobody knows who last used?" ...
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How to install ubuntu on a raid 5 array using mdadm

I want to install Ubuntu 13.04 (not server), I have 4 empty hard drives (/dev/sda, /dev/sdb, /dev/sdc, /dev/sdd), each 150 gb and /sdd is 160 gb and I have a Live USB. I want to install Ubuntu on a ...
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How do I migrate to a RAID10 array without losing data

I am running Ubuntu 12.04LTS, OS is installed on a small SSD so that should not be an issue when modifying the RAID array(s). I currently have four 2TB WD Caviar Green drives that I would like get ...
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Installing Ubuntu Server 12.04 on HighPoint RocketRAID 2720SGL RAID 5

I've installed a HighPoint RocketRAID 2720SGL card that I've connected 3 x 1.5 TB HDDs. After creating a RAID 5 within the RocketRAID BIOS using the 3 disks, I am attempting to install Ubuntu Server ...
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Installing problems with Dell Vostro 3460

I'm having problems installing 12.04 or 11.04 in a new Dell Vostro 3460. The issue becomes on the "Raid" performance that comes with the laptop, a 500GB HDD and a mini SATA 32GB SSD. With Windows ...
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Win7 -> Ubuntu 11.10 - Win Dynamic Disk Raid 1

I imaged my win7 system disk via ntfsclone + dd (mbr) to one of my Win7 Dynamic Disk RAID1 disks from within the Ubuntu LiveCD instance (only wrote to one of the disks in the win7 RAID1 array). I did ...
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252 views

Why is new raid 5 build 'recovering'?

I am building a home server with raid 5. I first set up the system to boot from compact flash. After i got that working I tried to create the raid 5 array. All disks are new and have no data on them. ...
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475 views

Do I have a raid or not?

I am building a new (power) system. MOBO is a ASUS Sabertooth 990FX. I've installed: 1 500GB HD for the OS and user accounts (mounted at /) Three 2TB drive set up on the BIOS as a single raid0 ...
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error: no such device: GUID

I have an old(er) machine that I'm trying to wipe out and install ubuntu 10.04. The machine has 4 500GB HDDs that were previously set up as a raid. When I run the installer, it asks if I want to ...
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Should I disable write cache in an mdadm array?

My gut says disabling write cache on soft RAID5 is the smart move, but I'm not certain. Possible Considerations: The drives a WD20EARS with 64Mb cache. The server hasn't gone down due to a power ...
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Using btrfs in RAID arrays and partitioning

Probably stupid questions but here goes: Can btrfs use only a portion of a HDD in a raid "array"? I have 3 HDDs: 80GB, 160GB, and 200GB external USB. I want to put root+boot in the first 20GB of the ...
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Is a disk/ata timeout exception dangerous?

I have a few hard drives in mdadm RAID 5 configured to go to standby after a few minutes of inactivity. (Using hdparm.conf spindown_time.) At irregular intervals I get messages like these in dmesg: ...
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Mdadm seems to have completely forgotten about a device and shrunk my array

After a bit of investigating of a problem I've just encountered, it looks like mdadm has completely forgotten about a new device I'd added to an array. I recently added a new device to the array which ...
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441 views

Does rebuilding a RAID change data?

I've just restarted my computer which was building up a RAID5 for the first time. This of course meant that my computer had to rebuild the whole thing from ground up. Before I restarted the computer ...
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149 views

Any howtos on de-Xen'ing a box? [closed]

I have a box that has Xen on it. It currently has only one DomU. Given that Xen isn't supported in the newer versions of Ubuntu...are there any good HOWTOs or other instructions for removing Xen? ...
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32 views

Restore RAID Drive on New OS

I had a problem with my Debian operating system on my SSD and have removed it (Debian) to install Ubuntu server. Originally, on my Debian operating system, I had installed mdadm and had a spanned ...
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How do you get a raid with 4 terabytes to give you the full disk amount in ubuntu server

I am running Ubuntu server 14. I have two 2 Terabyte Seagate drives raided to make a 4 terabytes. However when I mount the logical drive and run sudo lshw -c disk it shows as having 3999 GB of room. ...
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Automatic mounting RAID array which is mounted manually

For our server setup, we have a RAID array which is being setup once and we have actually never rebooted the server. Right now the array is working fine, but I would like to add its entry to fstab so ...
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Drive failed in RAID, other drive has SMART errors. Which to trust?

I've had a RAID1 setup running in my machine for a couple of years, and recently the array has become degraded. Looking at mdadm information, it looks like the one drive has failed, but when I look at ...
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162 views

Error removing an HDD from a RAID1 BTRFS array

I setup a btrfs filesystem on 3 disks with RAID 1. Somehow, a small portion (2GiB) got used as RAID0. At the time, no amount of running btrfs balance -dconvert raid1 -mconvert raid1 would change it so ...
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96 views

Software RAID disapears after rebooting

I'm currently trying to setup a media server and I'm having issues with my software RAID. It seems like once I reboot the server the RAID doesn't get assembled despite there being an entry in the ...
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482 views

BTRFS bad tree block start

First some background on my setup. I have 7 Hard Drives in a raid 5 (I know, move to raid 6, but not the issue here) array. On top of that, I run LVM, with a partition for btrfs. BTRFS is at version ...
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390 views

Remove disk from mdadm array, Raid 0

I have a 2 disk mdadm RAID 0 volume, 4TB total, created in Ubuntu 14.04 server. The volume is less than half full and I'm looking to unraid the disks, keeping the data so that I can use one of the ...
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86 views

mhddfs not working as expected

when I run df -h I get: Filesystem Size Used Avail Use% Mounted on /dev/sda2 74G 3.0G 67G 5% / none 4.0K 0 4.0K ...
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Can't reboot after installing 10.04LTS

I am trying to upgrade from 8.04LTS to 10.04LTS and onwards to 14.04. I first tried to download 10.04 via the Internet but the install crapped out half way through. I have now tried three times to ...
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Guidance on moving a raided / to a new set of disks

Running Ubuntu 14.04.1 up to date. Besides a ZFS pool I'm using for my data, I have my root partition on a mirrored software raid, and would like to move to two larger disks. Here is my parted ...
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Is there anyway to undo wipefs?

So I (very stupidly) performed a wipefs on my XFS formatted 4tb Linux (software) raid 5 array in trying to convert over to a bcache setup (I was following some instructions online and should have paid ...
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Recover data from RAID1 array (My Book Live Duo)

I have a WD My Book Live Duo device which I used as a network drive with a RAID1 configuration. The device, which was working flawlessly for almost 2 years suddenly stopped working, that is; it was ...
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343 views

Will the boot-degraded flag remain after upgrading to 14.04?

I am currently running Ubuntu 12.04 and have a RAID setup with the boot-degraded option. If I upgrade to 14.04 will the boot-degraded option remain? I manage this server remotely and would hate to ...
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MDADM RAID1 Home Server System disk error: incrementally starting raid arrays mdadm: Create user root not found

I'm not sure what else to check. Everything below looks sane to me but the system hangs on boot. This is a home server with four disks crammed into a Dell OP620. Each pair of disks are assembled as ...
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Ubuntu 14.04 desktop and RAID

I have 2 128GB SSDs on Asus Zenbook. I tried to boot into Ubuntu live CD (try Ubuntu) and create RAID from: Then tried to instal uUbuntu, but it fails to install grub on RAID. Another solution I ...