Tagged Questions

0
votes
0answers
33 views

Restore mdadm/lvm2 raid after overwriting partition table

I made a stupid mistake! I have an Ubuntu 11.10 and there I have 3x2TB disks in a RAID5 -> 4TB usable. I wanted to install a new 4TB disk in the computer. I opened gparted and created a GPT partition ...
3
votes
1answer
154 views

Need to find which drives are mirrored within RAID-10 array

I have a home media server running on openSUSE 12.2. I'm using eight 2TB drives in a RAID-10 configuration. I deliberately bought two different types of drives: four Seagate Barracuda Green and four ...
1
vote
0answers
67 views

Broken mdadm RAID after hard drive firmware update

I updated the firmware on the two hard drives in my raid array, and now the raid array does not seem to work. I'm running Kubuntu 12.10. Here is the output of some things I tried: sudo mdadm ...
2
votes
0answers
115 views

Mounting a raid1 device - no suitable drives found

I'm having some problems with my disks; long story.. but right now I'm trying to mount a device that was part of a 2-disk raid1. For that, I tried to assemble it into a new array, but... % mdadm -Av ...
0
votes
2answers
122 views

In mdadm's /proc/mdstat, what does [U_U] mean?

I just set up a raid 5 array for my media server. I set got 2 new disks, and set up an array with one missing drive, to copy the data from the old single drive to the new array, and later I will add ...
0
votes
0answers
38 views

Accessing data on a 2-of-3 mdadm RAID1

I have a mdadm device md1 which was composed of sda2, sdb2, and sdc2. One of sda or sdb has vanished on my latest boot, and now I cannot use md1. /proc/mdstat has: md1 : inactive sdb2[2](S) ...
2
votes
0answers
159 views

Cloning Ubuntu mdadm RAID1

I would like to clone a pair of RAID1 drives created with mdadm. I've tried Clonezilla, but there's no native support for mdadm, so it resorts to using dd which is incredibly slow. I've looked for ...
1
vote
1answer
146 views

Linux raid10 on btrfs

I've read that BTRFS requires at least 4 disks (https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices). Indeed, Linux mdadm raid10 requires only 2 disks ...
1
vote
1answer
86 views

how to boot without assemblying raid arrays (or assembling them correctly)

I had one debian 6 system with two harddisks on raid1 set up via mdadm. built on simple partitions (/dev/sdb3, /dev/sdc3). at least on the old system, everything is tied up via UUIDs. then i inserted ...
1
vote
0answers
39 views

Software RAID 1 resync's on SATA cable switch?

I made a mistake when I opened up my desktop removed a 2 disk RAID 1 and reconnected them, but with the SATA cables switched, such that sda became sdb and viceversa. On boot, the RAID array started ...
0
votes
0answers
194 views

Post raid5 setup reboot shows single hard drive failure on ubuntu 12.10?

I just set up raid 5 on linux using three HDDs as per a guide. It all went fine until when I rebooted I got the following text: http://i.stack.imgur.com/Zsfjk.jpg. Does this mean one of my HDDs has ...
0
votes
1answer
172 views

Linux system cannot find RAID 10 md device after reboot of the system

I ran these commands: $ sudo mdadm --verbose --create /dev/md0 --level=10 --chunk=256 --raid-devices=4 /dev/sdh1 /dev/sdh2 /dev/sdh3 /dev/sdh4 $ echo 'DEVICE /dev/sdh1 /dev/sdh2 /dev/sdh3 /dev/sdh4' ...
0
votes
1answer
61 views

How to create physical and logical volumes on system reboot

My system is set up so that I take four devices, create a RAID 10 array out of them, create a physical volume, a volume group, and then three logical volumes, and lastly I create filesystems out of ...
2
votes
0answers
613 views

Does TRIM avoid the performance impact of mdadm RAID 1 on SSD?

It has already been mentioned in other questions that Red Hat recommends against using mdadm RAID 1 on SSD. Red Hat also warns that software RAID levels 1, 4, 5, and 6 are not recommended for use ...
0
votes
0answers
41 views

Do a Re-Build During a Re-Shape?

On my Linux software RAID 6 array, I'm currently mid-reshape and 2 drives have been marked as failed. I've swapped them out and added new ones to the array, which are currently marked as spares. The ...
0
votes
1answer
57 views

Linux RAID Re-Shape Stopped

For the past 8 hours my mdadm re-shape process has been stuck. The output is: Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] md0 : active raid6 sdo[11] ...
0
votes
1answer
110 views

Disable writing RAID degraded mode

I have a RAID5 with 5 disks on my machine and suspect the motherboard chipset to fail at some points and make my raid going in degraded mode. Last time it happened I noticed it on the failure of the ...
1
vote
0answers
131 views

At what point does RAID 0 stop being fast and just become dangerous? [closed]

I have an interesting RAID setup across 2 harddrives on my home computer. I have /tmp and a mount point(/home/machines) for virtual machines (along with a few other mount points). These partitions I ...
3
votes
2answers
107 views

Can a non-redundant RAID5 cause any serious problems (compared to RAID0)?

I used to have a three-disc RAID5 (mdadm) in my computer for personal media storage (music, videos, photos, programs, games, ...). It had three discs with 750 GB each, resulting in an array capacity ...
1
vote
2answers
211 views

Migrate mdadm raid array from 32bit to 64bit debian squeeze

I have a raid5 array running on Debian Squeeze 32bit (x86) and I plan to upgrade to Debian Squeeze 64bit (amd64). To keep my raid5 array and ext4 filesystem I simply keep a copy of my mdadm.conf ...
0
votes
1answer
466 views

How do I reinitialise a failed RAID 5 drive using terminal on Ubuntu Server

I've currently put together a new system and part of that has been creating a software RAID 5 using 'mdadm' in Ubuntu Server. I successfully got to the point where I create the array using: sudo ...
4
votes
2answers
1k views

mdadm RAID Fast Setup with Empty Drives?

I am recreating some RAID5 disks as RAID6 with mdadm. There is no data on the drives that I care about. Setting up RAID takes a while to setup the shape - I accept that when there there is data that ...
12
votes
7answers
9k views

Simple mdadm RAID 1 not activating spare

I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin. The command sudo mdadm --detail /dev/md0 used to ...
1
vote
3answers
418 views

Linux software raid robustness for raid1 vs other raid levels

I have a raid5 running and now also a raid1 that I set up yesterday. Since raid5 calculates parity it should be able to catch silent data corruption on one disk. However for raid1 the disks are just ...
1
vote
2answers
393 views

Can I use an entire drive for as a software raid member?

Can I use /dev/sda and /dev/sdb for my RADI1 configuration? Or do I first have to partition both with a single Linux raid partition?
1
vote
0answers
512 views

mdadm: hot remove failed

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
3
votes
3answers
2k views

Does RAID1 increase performance with Linux mdadm?

I have a cheap 2-bay NAS with a 2TB HDD. To be robust against disk failure, I'm thinking of buying a second 2TB HDD and putting it in RAID1 with Linux mdadm. The file system is ext4. Will this ...
2
votes
1answer
550 views

How to remove a drive from a non-standard 2-drive RAID 5 array?

There is some information available on shape changes in RAID arrays but I'm a little nervous and would like confirmation: Problem: I have 2 500GB drive as software raid 5 (mdadm). I would like to ...
4
votes
2answers
8k views

How-to change the name of an MD device (mdadm)

Here is the output from mdadm -Esv: ARRAY /dev/md127 level=raid0 num-devices=2 UUID=d89d9d45:9a420812:c44c77eb:7ee19756 devices=/dev/sdb8,/dev/sda8 This is a v0.90 array. The question is as ...
0
votes
1answer
2k views

determine chunk size of an existing raid array

What should I do to determine chuck size of existing raid arrays. I'm using software raid created by mdadm. I've been probing around for a while and can't find the right utility to that job. mdadm ...
5
votes
1answer
586 views

Is it safe to put harddisks of a md-software-raid to standby?

I have a home-fileserver with 6 desktop harddisks in a md-raid. The server isn't accessed a lot, so I think it would be good for the harddrives to go in standby-mode after some idle time (e.g. with ...
2
votes
4answers
3k views

Adding drives to a RAID 10 Array

How would I grow a RAID10 array using mdadm? Obviously I would need to add 2 drives at a time, or would it have to be 4 drives? I have a feeling its just a bad idea. Or would be just wiser to just ...
1
vote
1answer
580 views

Recover Linux software RAID5 array after server upgrade

I recently upgraded a server from Fedora 6 to Fedora 14. In addition to the main hard drive where the OS is installed, I have 3 1TB hard drives configured for RAID5 (via software). After the upgrade, ...
6
votes
3answers
15k views

How can I make mdadm auto-assemble RAID after each boot?

I successfully created a RAID (mirroring) by utilizing mdadm. However, I must run the following commands after each boot: mdadm --stop --scan // to stop /dev/md127 - I don't know where the number 127 ...
0
votes
1answer
759 views

raid-1: increase rebuild speed on current rebuild

I see my raid-1 array rebuilding (first time after adding 2nd partition) and want to increase speed SO I set echo 100000 > /proc/sys/dev/raid/speed_limit_min echo 400000 > ...
3
votes
3answers
142 views

Can RAID5 drives be defective while passing self-tests?

I have a 4-drive RAID5 in Ubuntu 10.10 with mdadm. One of the disks seems to be problematic. It dropped from the RAID, and I re-added it and it was fine for a while, but now when I re-add it I get a ...
6
votes
3answers
3k views

Raid1 with active and spare partition

I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was ...
1
vote
3answers
274 views

Fluctuating transfer speeds with md RAID5/vsftpd

I have an Ubuntu 8.04.4 server with an md RAID5 consisting of 9 drives. While transferring a large amount of data to it (through vsftpd) I noticed very bad transfer speed fluctuation. For example ...
0
votes
1answer
778 views

mdadm device missing

after a reboot my /dev/md0 device was missing. This is a RAID-1 array from two partitions of two harddrives. On each of the harddrives is another partition, which together belong to dev/md1. However, ...
1
vote
1answer
285 views

Paritions “appear” in my raid 1 array after reboot, and the partitions in the array have changed names

I am moving my Ubuntu install to lvm over raid 1. I created the arrays with only 1 disk initially, planning to add the second disk later. I got the files moved and the system booted up succesfully on ...
3
votes
1answer
2k views

Possible mdadm RAID states?

I'm writing a monitoring plugin for a home server RAID, mdadm on Ubuntu 10.4. Using sudo mdadm --detail /dev/md0 I get output like this: /dev/md0: Version : 00.90 Creation Time : Thu Dec ...
2
votes
1answer
183 views

Gentoo Linux -> Ubuntu: Can I Preserve My LVM/RAID Devices, Or Do I Need To Reformat?

I've got a Gentoo box that I'm interested in switching over to an Ubuntu box. I currently have the partitions laid out using a mixture of RAID (mdadm) and LVM2, as specified in this document [1]. ...
2
votes
3answers
910 views

RAID-1 and regular drive removal (using RAID-1 as a backup measure)

Is using mdadm's RAID-1 of 2 partitions (one on laptop's internal HDD, one on external HDD) a good idea. I want the system to work as RAID-1 if both drives are present, work as regular volume ...
18
votes
8answers
44k views

How to get an inactive RAID device working again?

After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount ...
6
votes
3answers
8k views

Creating a RAID1 partition with mdadm on Ubuntu

I'm trying to set up a RAID1 partition on my Ubuntu 9.10 workstation. On this dual-boot system, Ubuntu is running from a separate drive (/dev/sdc - an SSD that is quite small, which is why I need ...