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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Reformat soft RAID-5 Ubuntu [closed]

I built a linux (Ubuntu) box a year ago and decided to have some fun and use a soft RAID 5. I followed the instructions here. Things seemed to work fine, but now it's time to reformat the computer ...
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2answers
947 views

How come 11.10 doesn't come with some of the applications from 11.04?

I have a fresh install of Ubuntu 11.10 (oneiric) on a RAID stripe. In order to install on a RAID I had to use the Alternate Installation (ubuntu-11.10-alternate-amd64.iso) I noticed off-the-bat that ...
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3answers
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RAID 1 array not found in server installer

So I'm trying to install the last version of Ubuntu Server 11.10 64bits on my server ( replacing Windows Server 2008 completely ). Since I need more Sata ports, I bought a PCI Sata RAID Controller ...
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3answers
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MDADM Superblock Recovery

After a power cycle I found my RAID 5 Array no longer working. I tried various methods to reassemble the array but nothing has worked so far. I believe I need to recreate the superblocks and UUIDs ...
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1answer
223 views

Do I need the alternate installer to install on a box with existing raid 0?

I have an existing machine with three drives, two of which are joined in a raid 0; on my old distro, this was mounted at /home When I went to install Oneiric, it recognized each drive separately; the ...
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1answer
817 views

How to remove swap from RAID1 Array?

Can anyone point in the right direction on how to remove SWAP out of a RAID1 configuration? According to the Ubuntu Advanced installation guide, here, it said to add swap to the raid but I am having ...
2
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1answer
568 views

Problem with grub to dual-boot in raid system

I've got two HDs in a raid system and Windows 7 installed in a partition. When I try to install Ubuntu in the other partition, the installer says the bootloader can't be installed. I've mounted ...
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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 - ...
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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 ...
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1answer
5k views

How can I access an Ubuntu RAID device from Windows?

I have Ubuntu installed on an Ext4 RAID1 with Windows 7 on another disk. The RAID is a software RIAD setup in Ubuntu. I've used the Ext2Fsd project to mount normal Ext4 systems, and it works well. ...
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391 views

Why does Grub2 break EVERY time I update my laptop?

I'm running Ubuntu 11.04. I just don't understand it. It doesn't matter if it is a kernel upgrade, or an Adobe Flash update. The next time I restart my computer Grub2 breaks. All I get is a blinking ...
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4answers
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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, ...
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4answers
9k views

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 ...
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3answers
3k views

Add new hard drive to mirror existing LVM drive with raid1

I have a 320GB hard drive with an LVM2 volume group that was created as part of the default installation. If I put a second 320GB hard drive into the computer, can I make the second drive mirror the ...
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1answer
810 views

Grub can't find RAID partition in fresh install of 11.04

I attempted to install 11.04 on a Dell PowerEdge-R610 that has a LSI SAS1068E-based hardware RAID setup (I think). Installer finishes without a hitch, but upon reboot, it appears that Grub can't find ...
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2answers
2k views

Is it possible to grow a luks-encrypted external raid5 array?

I'm planing to buy an external raid array (hardware raid5). My intention is to outfit it with 4 disks initially and encrypt it using luks and dm-crypt. My question is: Will I be able to hot swap disks ...
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1answer
661 views

Ubuntu can't mount swap from RAID1

I have just built a new server to host a minecraft server. I have two hdds that are in hardware raid 1, and I have installed Ubuntu Server 11.04 on those disks. My problem is that anytime I reboot I ...
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1answer
909 views

Why can't Ubuntu 11.04 installer see all my partitions?

In February last year, I built a new PC from parts. Fast foward 16 months, and I'm repeatedly cleaning malware infections from Windows 7. I decided to try Ubuntu on my PC. My PC has hardware raid. ...
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2answers
635 views

How do I get a new drive integrated into my software RAID?

When I first installed Ubuntu a couple years ago, I set it up with a software RAID using the Ubuntu alternate install disk. I have two 500 GB drives in the RAID. A few days ago, one of the drives ...
0
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1answer
348 views

Degredation test of RAID 1

I have just configured two hard drives with RAID1 via an ubuntu 10.4 installation. It is installed to boot in degraded mode. I want to disconnect the power from the one drive and have it boot, and ...
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1answer
327 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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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 ...
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1answer
621 views

Installing 10.04 server on HP xw9400 Workstation with RAID 5

I have a workstation that was given to me that is a friggen powerhouse, so I figured I would set it up as my development and demo server. This is my first experience installing Ubuntu onto a RAID ...
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2answers
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How does btrfs RAID work in degraded mode?

My idea was that (using loopback devices) it works like this Create the raid array sudo mkfs.btrfs -m raid1 -d raid1 /dev/loop1 /dev/loop2 You mount them sudo mount /dev/loop1 /mnt and mark them ...
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1answer
205 views

How do I configure my 2 RAID drives so I can use it as /home?

I've installed Ubuntu 11 64-bit to a 2 TB drive. It is on /dev/sda - port 1 of SATA Host Adaptor. This contains /dev/sda1 (1 MB boot), /dev/sda2 (2TB EXT4), /dev/sda3 8.6GB SWAP. I also have: ...
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5k views

Delete mdadm array but keep data

I have a two-disk mdadm RAID1 array. One of the disks has died so the array is in a degraded state. It's been like this for a while and while I didn't mind getting the occasional email through, ...
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1answer
2k views

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 ...
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2answers
1k views

Possible/viable to make a btrfs RAID between SSD and HDD?

Since I don't use my laptop's CD-drive I want to put a small (8 GB) SSD into the CD-drive slot (I'll use a caddy similar to this one). I want to use compressed btrfs on the SSD and put all the data on ...
4
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1answer
1k views

Dual Boot Ubuntu 11.04 / Vista 32 with a RAID 0

I tried to install Ubuntu 11.04 several time using all the informations I could gather on the web. But I still fail to install it, and as my Vista partition contains very important informations I ...
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1answer
2k views

Testing my raid array / is my mdadm raid working OK? [duplicate]

Possible Duplicate: MDADM Superblock Recovery This may just be me being very stupid but I don't get it! I am new to mdadm raid configuration and my system configuration is as follows: 1 * ...
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1answer
759 views

How do I fix a slow boot on a RAID setup?

I've just finished setting up a RAID 1 on my system. Everything seems to be okay, but I have a very slow boot time. It takes about three minutes between the time I select Ubuntu from GRUB and the time ...
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4answers
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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 ...
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1answer
671 views

Fake RAID (dmraid) not seeing new SATA drives

I have three drives in my machine, one SSD with 32GB and two 1TB drives, attached to an Intel 82801JI (ICH10) SATA AHCI Controller. The problem is, that I can access only one of the 1TB drives when ...
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2answers
3k views

How to install and boot on a RAID 5 Configuration?

I've been trying for a couple of days now to get Ubuntu 10.10 installed on a RAID 5 setup. I have 3 1TB drives so I also need Ubuntu to boot off of one of those drives. From what I've been able to ...
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2answers
282 views

What does “md value mismatch_count” count?

Since upgrading to 11.04 I have been trying to get my 5 disk RAID5 array back online. The array was initially split in two, I tried to use a create command with the assume clean option to get it back ...
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2answers
1k views

Resilience of Btrfs inside RAID5

Btrfs currently lacks fsck, risking corruption if there's a power failure. To what extent, if at all, would creating a btrfs filesystem within a RAID5 array mitigate this?
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How do I recover my RAID partition after the Ubuntu 11.04 upgrade?

My RAID drive was working well with Ubuntu 10.10, but after doing an upgrade I am no longer able to mount my RAID drive. I think it is due to a invalid RAID description similar to this problem: ...
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1answer
1k views

How do I recover my RAID partition after the Ubuntu 11.04 upgrade? [duplicate]

Possible Duplicate: How do I recover my RAID partition after the Ubuntu 11.04 upgrade? My RAID drive was working well with Ubuntu 10.10, but after doing an upgrade I am no longer able to ...
0
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2answers
495 views

How to mount FakeRAID to /home of a new system?

I'd like to know how to re-mount the FakeRAID disk to the new system safely so that I won't losing my data. I'm going to install ubunto10.10 to root My old computer setting: 1 320G Disk for / 2 ...
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2answers
16k views

“Special device does not exist”

I have 3 hard drives in my machine. Two of them are 1TB drives with my old home partition on a software RAID1. I installed an SSD as a 3rd drive with a fresh Ubuntu 10.10 currently running. I now try ...
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2answers
706 views

Ubuntu Server installation command mode - cfdisk command not found

I'm trying to install Ubuntu 10.04 server with LVM+RAID. However, when I use cfdisk command to create new partition, I received the message: /bin/sh: cfdisk: not found. Please advise me. Thanks.
2
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2answers
977 views

How do I install Ubuntu 10.10 beside Windows 7 onto a fake raid?

I currently have 4 drives setup in Raid 10. I've tried installing Ubuntu straight to the metal but it does not recognize my Windows partition and upon quitting the installation and then restarting, my ...
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1answer
1k views

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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2answers
717 views

How to migrate installed system to RAID1?

I have home server (Ubuntu Server 10.04) which boots from single 80Gb HDD drive, now I want to make it boot from 2x500Gb RAID-1. I've already successfully created it through MDADM. But how can I move ...
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870 views

RAID 10 not being found by installer

I had ubuntu installed with raid 0 enabled. I have added 2 more disks went into the bios deleted and created a new raid setup using raid 10 (total of 4 disks now). However during install of ubuntu ...
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1answer
2k views

How to access a fake raid?

I have a fake raid, which I wanted to access using mdadm /dev/md0 -A -c 128 -l stripe --verbose /dev/sda /dev/sdc which should be right, as far as I understand the man page. But I get the message ...
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2answers
812 views

Did I lose my RAID again?

A little history: 2 years ago I was really excited to find out that mdadm is so powerful that it even can reshape arrays, so you can start with a smaller array and then grow it as you need. I've ...
4
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2answers
2k views

RAID slow on all levels

I am getting very slow write speeds (<1MB) with RAID 1 and RAID 0 (striping and mirroring). The read speeds are sufficiently fast but writing is very slow. At first I thought it was just poor ...
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1answer
736 views

Raid md device is not remove from memory, how to overcome this problem

I create raid 10 , i removed two arrays form md11 one by one , after that i going to editing the contents those are mounted ( it will be not responding stage), after i try for remove arrays those are ...
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1answer
662 views

Is Error Recovery Control or TLER necessary for software RAID5 using LVM

I ave been told that for RAID configurations you don't what to use standard desktop drives because they when/if they enter a error recovery mode they might time out and get dropped from the raid. Is ...