A linux utility used to manage software RAID devices.

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Grub2 w/ RAID5 and btrfs “error: unknown filesystem”

I have a Virtual Machine (in ESXi 5.1) running Ubuntu Server 12.04. When I try to boot my system I grub2 tells me "error: unknown filesystem". I've tried booting a Live CD then reinstalling grub from ...
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172 views

mdadm reassemble from spare disk crashed during resync

The server crashed while raid-1 /dev/md2 with /dev/sda3 + /dev/sdb3 was resyncing from /dev/sdb3 to /dev/sda3. sadly, /dev/sdb was lost completely due to a hardware fault. I'm now left with only ...
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131 views

Recovering a Raid1 array from a broken drive

I've been asked to look at a computer which had a Raid 1 Array in it until one drive failed 12 months ago without being picked up and has now been replaced but the other drive is also in a bad way and ...
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123 views

Resize a RAID 5 Partition

I'm moving my VG to a RAID, i have 3 disk 600GB, the VG is in the partition /dev/sdc2 /dev/sdc1 1G type linux <-- Boot partition /dev/sdc2 599G type Linux LVM One disk have the VG and with the ...
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215 views

Attempt recovery of MDADM RAID, on images created with dd

I have a software RAID5 array with 4 + 1 disks in which 2 of the disks have failed. I'm hoping that with some percussive maintenance, I might get one of the failed disks working again long enough to ...
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655 views

How to get notified of mdadm RAID problems?

I am running Ubuntu 12.04 LTS. Yesterday I found a message in my mailbox saying that my server was shut down. I proceeded to reboot the system, but it didn't come up after many minutes, and I didn't ...
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86 views

why cant I set the correct partition size in fdisk

I am currently attempting to setup a raid array. At this point in time I am setting up partitions of the same size on each hard drive that I would like to use in the array, although when I used fdisk ...
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397 views

Are ext4 RAID5 tuning options useful under LVM?

I'm setting up a system with a system with a mdadm RAID5 which is the sole PV for a VG which hosts 4 LVs. When I make the filesystem, would the mkfs.ext4 -E option be useful? Or is its effect not ...
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187 views

mdadm raid1, drive failure lost 14days worth of data?

I am rather confused. One evening I had a server which had died. I went to reboot it and noticed it was stuck on the "GRUB" boot screen. I then noticed a hard drive had failed. I put a new hard drive ...
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603 views

how can I set the data offset on an mdadm device?

I am trying to recover from a degraded RAID array. I stupidly used mdadm --create somewhere along the way, and now a couple of my devices have incorrect superblocks. Luckily I kept a copy of the old ...
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189 views

Linux mdadm --grow RAID6: Something wrong - reshape aborted

I have a RAID60 that I want to expand. The current is: 2 axles each having 9 disks + 2 spares. The future is: 4 axles each having 10 disks + 1 spare. So I need to do some --grow to reshape the ...
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92 views

Is my server toast?

Last night I received an e-mail from mdadm about the possible failure of two drives on my array. The raid array was set up as a 4 2TB drive raid5 with one hot spare. Is this system truly fried? Did ...
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796 views

Is it safe to interrupt a mdadm --grow operation?

I recently changed the disks in my RAID5 from 3x2TB to 3x3TB. I also wanted to change the chunk size from default 512k to 128k. I have added all new devices to the array and I run: mdadm /dev/md1 ...
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1answer
131 views

Replacement raid1 drive is one block smaller. What to do?

Apparently once should always leave a bit of empty space at the end of each raid1 partition. But if we're too late for that, what can be done if a replacement RAID1 drive is slightly smaller than the ...
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3k views

mdadm mdadm: cannot open /dev/sda1: Device or resource busy

I am having trouble going from a single disk to raid 10 The command issued is: mdadm --create /dev/md0 --level=10 --raid-devices=8 /dev/sd[abcdefgh]1 The output is: mdadm mdadm: cannot open ...
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1answer
518 views

Resize openSUSE 12.3 GPT ext4 partitions in a RAID1 disk array

I have a software raid configured (/dev/md2) which has assigned the partitions sda3 and sdb3 from two 3TB disks (sda and sdb). The partition types are GPT not LVM and file system is ext4. Now, the ...
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456 views

mdadm: Growing a RAID0 Array Weirdness

I have created 3 RAID0 arrays using mdadm on 3 Rackspace CloudServers using Rackspace's CloudBlockStorage as their devices. Each array has their own set of CBS volumes. RS-CBS has an upper limit of ...
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312 views

mdadm Device or resource busy not by dmraid

I have an issue with a new mdadm raid. When i try to: root@dys:~# mdadm --add --verbose /dev/md0 /dev/sdb1 mdadm: Cannot open /dev/sdb1: Device or resource busy dmraid i pointed as the usual ...
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294 views

Remove “faulty state” in RAID 1

I wonder if there is any possibility to remove the state "faulty" in a RAID 1 if (for example) someone failed the wrong hard disk. I already searched for answers with Google and fout several ...
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51 views

identical drivers different pv size

i've got strange situation with identical drives: pvdisplay --- Physical volume --- PV Name /dev/sda5 VG Name group1 PV Size 465.52 GiB / not ...
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77 views

Expanding raid5 software raid

I have recently bought 4 2TB drives to expand my existing 4*2TB raid5 setup, using mdadm software raid in debian. As a initial step, I have created a raid5 on the four new drives and created an ...
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322 views

mdadm: Which disk is being rebuilt?

I noticed my software RAID1 degraded, and wanted to figure out which of the two disks in the array is being rebuilt/re-synced since they both show as being up. I am hoping someone can shed some light ...
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344 views

mdadm - raid device name changed on reboot

I'm not sure why, but after I restarted my ec2 instance, /dev/md0 didn't start as it normally would. after I saw what's available in /dev/md*, instead of seeing /dev/md0, there is a device there named ...
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70 views

MDADM did not kick off rebuild after a disk is inserted

I am new to Linux software RAID. I constructed a RAID6 with 6 hot-swappable SATA disks. I tested the failure scenario by unplugging 1 disk. The OS removed the devices from /dev and mdadm showed that ...
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130 views

removing software raid without data loss

i wonder if/how i can stop my linux machine using the installed software raid, without loosing any data. All information i found was about removing the superblock of any hdd, and this is o/c what i ...
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163 views

MDADM not assembling raid0 that is part of a raid5 on boot

I use a RAID0 (md2) as a device in a RAID5 (md3) setup (see below). Now everytime the computer boots, mdadm will mark md3 as degraded and i am forced to re-add md2 as a new spare. Of course mdadm then ...
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531 views

Removing raid metadata from drives

Normally when I have a drive which contains raid metadata e.g. from fakeraid or a hardware raid card I can get rid of it with: dmraid -r -E /dev/sdX Or if that doesnt work, doing a simple dd ...
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1k views

mdadm raid 1 grub only on sda

I just finished setting up a CentOS 6.3 64bit server with mdadm however a lightbulb went on and I realised grub would only be installed on the first drive which is about as much use and an ashtray on ...
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315 views

Why mdadm --examine --scan gives two same ARRAYs? [closed]

The following confuses me: [root@mrak ~]# mdadm --examine --scan ARRAY /dev/md/0 metadata=1.2 UUID=d3f800db:26de8691:dc0caf45:0f75028b name=mrak.dex.internal:0 ARRAY /dev/md/0 metadata=1.2 ...
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1k views

DegradedArray event on /dev/md1

This morning I got this message: This is an automatically generated mail message from mdadm running on A DegradedArray event had been detected on md device /dev/md1. Faithfully yours, etc. P.S. ...
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301 views

mdadm keeps removing disk

As the title suggests, mdadm keeps marking a drive as "Removed" (from mdadm --detail) and I was hoping to get suggestions as to why that might happen. I was wanting to fsck the drives however I got ...
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1answer
341 views

df showing wrong disk usage - disk corrupted

I'm getting a rather odd result from df from one of my disks using mdadm. It's setup as 4 of 2TB disks in raid 10. # df Filesystem Size Used Avail Use% Mounted on /dev/md2 ...
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193 views

Linux mdadm RAID5 data recovery with one drive failed, one drive failing

Improbably I had two drives fail in the same Raid5 array within 2 weeks of one another. Which means the array is dead. Yes yes hot spares not being lazy about replacing the failed drive I know. But ...
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264 views

mdadm did not notice a failed disk in raid0

I have a server with mdadm raid0: # mdadm --version mdadm - v3.1.4 - 31st August 2010 # uname -a Linux orkan 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux One of the disk has ...
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162 views

raid 5 mdadm drive dropped whilst growing

I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk. ~# mdadm --add /dev/md1 /dev/sdb ~# mdadm --grow /dev/md1 --raid-devices=5 midway through the grow I recieved this in ...
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81 views

Fresh debian squeeze software raid install wont boot

I am following these instructions: http://www.iprobot.net/linux-tutorial/how-to-setup-software-raid-in-debian-ubuntu/ (I used debian-live-6.0.6-amd64-gnome-desktop.iso and DD'd that onto a usb key, ...
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Adding Additional RAID Array to Ubuntu 11.10 x64 Server

I asked this on askubuntu.com as well but since it's a server question, figured I'd throw it on SF, too. Haven't run into this situation before but it seems simple enough. Looking for advice/guidance ...
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119 views

Disaster recovery for RAID and mdadm

I´m having a software raid 5 with 5 2TB members. After partitioning with gparted, my RAID doesn´t work any more... How can I check the consisty of each member? What would be my options, if the ...
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262 views

Linux software RAID 10 array, failed drive, resize file system and migrate to a 3 drive RAID 1?

I have a software RAID 10 array which I recently noticed went into a degraded state. The OS is CentOS 5.8. It has 4x 500GB drives in 3 different arrays: /dev/md0 is RAID 1 and mounted to /boot (200MB ...
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450 views

Device in software RAID 10 array: clean, degraded. Ouch?

I've got 4x 500GB drives in software RAID. /dev/md0 is RAID 1 and mounted to /boot /dev/md1 is RAID 10 and is swap /dev/md2 is RAID 10 and is the main system and data device I looked at mdadm this ...
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2answers
1k views

mdadm stalls rebuilding a RAID5 array at 99.9%

I recently installed three new disks in my QNAP TS-412 NAS. These three new disks should be combined with the already present disk into a 4 disk RAID5 array, so I started the migration process. ...
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1answer
1k views

How do you set up RAID1 with both disks bootable on Debian/Ubuntu?

In Debian 6, new installation, what is the recommended way of setting up a software RAID1 array so that the system is bootable from both disks? I have heard that people that don't know what they are ...
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765 views

Ubuntu 12.04 LTS Update - With Error: “YOUR SYSTEM IS NOW UNBOOTABLE!”

I just did an apt-get dist-upgrade and saw the following error: cryptsetup: WARNING: failed to detect canonical device of /dev/md1 cryptsetup: WARNING: could not determine root device from /etc/fstab ...
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129 views

mdadm drive UUIDs chanaged, can they be changed back?

So I ran into this trouble and I believe I lost all my data..However I found an old mdadm --examine --scan file I made a month ago and an old mdadm.conf....Is it possible to use these two items to fix ...
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105 views

mdadm: Disk configuration by UUID

I want to create a soft RAID-5 and use UUIDs im the mdadm config file. So I have four disks with 1 partition each that spans the whole disk. But since the partitons don'5 have a filesystem, blkid does ...
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5k views

mdadm rebooted, array missing? can't assemble?

Not sure what is going on with my Array. I rebooted ubuntu 12.04.1 and got a error on startup that fstab couldn't mount the filesystem UUID I have for my mdadm array. After running a few commands a I ...
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183 views

Raid1 disk degraded after reboot

I'm testing a Rackspace cloud server and have two Cloud Block Storage volumes set up in a Raid1 configuration. There are no system files on these volumes, they're purely for storage. Everything ...
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290 views

Device cannot be added on software-raid-1 array on Ubuntu 12.04

Unfortunately all tutorials I have found online until now on how to setup software-raid-1 are outdated on ubuntu 12.40 My target is to setup it on a system with a secondary disk drive that is already ...
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393 views

reliably and automatically determine connection path of physical position of HDD from /dev/sdX device file

This is kind of a FAQ, but all the answers I found so far are not suited for full automation, which is what I need. So here it goes again. In Linux: Is there a reliable way to resolve the udev ...
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468 views

Software Raid 10 corrupted superblock after dual disk failure, how do I recover it?

I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os ...