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.

learn more… | top users | synonyms

0
votes
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 * ...
1
vote
1answer
740 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 ...
25
votes
4answers
87k views

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 ...
3
votes
1answer
656 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 ...
3
votes
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 ...
1
vote
2answers
263 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 ...
0
votes
2answers
2k 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?
0
votes
2answers
5k views

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: ...
0
votes
1answer
2k 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
votes
2answers
494 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 ...
3
votes
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 ...
0
votes
2answers
683 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
votes
2answers
968 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 ...
1
vote
1answer
2k 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 ...
3
votes
2answers
706 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 ...
0
votes
2answers
865 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 ...
2
votes
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 ...
3
votes
2answers
770 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
votes
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 ...
1
vote
1answer
726 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 ...
2
votes
1answer
639 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 ...
7
votes
4answers
13k views

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 / ...
0
votes
1answer
495 views

AMD Raid SMART Tests Ubuntu Server

I have an AMD SB with Raid 1 set up through that. I installed Ubuntu Server with no problems. However I know through windows one can set up SMART Tests with AMD's software. Is there a way to run SMART ...
1
vote
1answer
1k views

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 ...
1
vote
3answers
1k views

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 ...
1
vote
1answer
5k views

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: ...
1
vote
2answers
5k views

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". ...
4
votes
3answers
11k views

Why can't Ubuntu find an ext3 filesystem on my hard-drive?

This question is related to this question: Not enough components to start the RAID array? I'm trying to retrieve data from a "Western Digital MyBook World Edition (white light)" NAS device. This is ...
7
votes
1answer
16k views

Not enough components to start the RAID array?

I'm trying to retrieve data from a "Western Digital MyBook World Edition (white light)" NAS device. This is basically an embedded Linux box with a 1TB HDD in it formatted in ext3. It stopped booting ...
2
votes
2answers
7k views

Restoring GRUB2 on Software RAID 0 using LiveCD after Windows 7 wiped it

I have installed Ubuntu 10.10 on my system. However, I need to install Windows 7 back, and I expect that it would alter GRUB and it did. Right now, my partition on my Software RAID 0 looks like this: ...
4
votes
2answers
16k views

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, ...
1
vote
1answer
1k views

How to fix boot message [RAID partition] not ready yet? [duplicate]

Possible Duplicate: mdadm: breaks boot due to “is not ready yet or not present” error I've got a RAID 5 setup for my /home partition. Every two to three boots my hdisks don't ...
3
votes
1answer
2k views

How do I unmark a “failed” md device?

In an effort to clean up from a software bug in md, I marked half of a RAID (/dev/sda1 and /dev/sdb1 in RAID1) as faulty using: mdadm /dev/md2 --fail /dev/sdb1 mdadm /dev/md2 --remove /dev/sdb1 But ...
6
votes
1answer
15k views

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 ...
5
votes
2answers
6k views

Rebuild mdadm Raid5 after OS hard drive died

I have an ubuntu desktop 10.4 "server" with 5 hardrives. 1 of the hardrives had 3 OS's on it (Windows Vista, Windows XP, and Ubuntu 10.4). I primarily used the ubuntu OS so that I could use mdadm and ...
12
votes
7answers
22k views

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 ...
1
vote
1answer
1k views

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 ...
1
vote
1answer
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 ...
3
votes
1answer
579 views

Is it normal that mdadm has to start from scratch when I restart my computer while it's rebuilding the third disk?

I've installed a RAID5 using mdadm yesterday. Since then it has been rebuilding. I just restarted my computer and it started rebuilding the RAID from scratch. (Had 60% before.) Is this normal or are ...
13
votes
4answers
43k views

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 ...
1
vote
1answer
363 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 ...
5
votes
4answers
2k views

Can I create a 4TB Raid 1+0 volume?

I'm thinking about setting up a NAS based on Ubuntu server, but before I invest the money, I want to make sure what I want to do is possible. What I'm thinking is a 4x2TB Raid 10, so my usable ...
2
votes
2answers
450 views

How does Ubuntu handle looking at a Windows Raid?

If I install Ubuntu on hard drive A and mount (via nautilus) hard drive B that has Windows 7 installed on it with a RAID1, could Ubuntu even remotely screw up the RAID Controller? Or would it look at ...
2
votes
1answer
1k views

I've lost my MBR and now I can't boot

The other day I was doing my backups and I was looking for more space to store my videos. So I formatted one of my harddrives (I have 4 not counting the external I was backing up to), but this ...
3
votes
1answer
1k views

Installing server on unsupported Areca RAID Controller

I just got a new server that has a brand new Areca 1880 Raid controller which the built in arcmsr module does not support. Areca has updated module source code available on the cd that came with the ...
2
votes
1answer
5k views

Move RAID1 to new machine [closed]

I have an older server with / on one hard drive and /srv on a RAID1 partition, which I remember took some time to set up (I set it up after the installation). I will be installing Ubuntu 10.04 onto a ...
1
vote
2answers
3k views

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 ...
1
vote
1answer
144 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? ...
6
votes
2answers
3k views

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?
2
votes
1answer
3k views

How can I create a software RAID drive and install Ubuntu Desktop on that drive?

Since GParted does not support RAID, what tools can we use to create a RAID drive (0,1,5 etc) and then install Ubuntu onto that drive? Assume we are starting on fresh system with no OS.