A linux utility used to manage software RAID devices.

learn more… | top users | synonyms

3
votes
1answer
25 views

Is it possible to undo LVM pvmove?

I'm about to convert my 2x3TB LVM setup to use software RAID1 with 2 additional drives. I'm just wondering if the following will be safe and if there is a way to recover at various steps. So I have /...
0
votes
0answers
22 views

Building trust in linux RAID mirroring [closed]

I have been trying to form a solid understanding of how RAID works in linux but unfortunately the information is too scattered in bits and pieces to be able to succeed. I am mostly interested in RAID ...
0
votes
1answer
29 views

mdadm 2x Raid 5 missing drives

I'm hoping someone can steer me here with a re-build/sync issue. I have a 3 raid 5's build in mdadm 4 disks in each md0 (Active, degraded), md1 (Active, degraded) and md2 (Clean) -no data on it, so I ...
0
votes
0answers
26 views

Help needed with Raid 5 that was working OK

My parents had a Netgear RN 104 that stopped working properly, they messed with some settings, messed it up and gave it to me to fix. It has 4 x 4tb drives in Raid 5. I've used mdadm before to ...
1
vote
1answer
28 views

Error assembling mdadm RAID1 after resizing underlying partitions

I want to shrink a mdadm RAID1 from 2TB to 100GB. This is how the setup looks like before shrinking. root@rescue ~ # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 3.7T 0 ...
0
votes
1answer
43 views

mdadm - not enough to start the array

I am trying to recover data from a MyBookLiveDuo 3TB*2 RAID1 setup, which is not responding to http/ssh access. I pulled one drive out of the enclosure and attached it via SATA to a Linux laptop. I ...
1
vote
1answer
14 views

Can I recover filenames from a failed RAID0 (Linux Debian 5.0.8)

Linux Debian version 5.0.8 is running on my Iomega NAS and it has a RAID0 array of four 3TB disks that failed on the "third" disk. I am aware of the non-redundancy of RAID0 but I would like to ...
0
votes
0answers
23 views

Converting A Physical Ubuntu Server with boot raid 1 to a Xen domu

So here's the situation: 1 physical server running a very outdated version of ubuntu 14.04 Booting off of a a software raid 1 configured in the installation. This server runs mission critical ...
0
votes
1answer
20 views

How to re-create RAID1 really properly

System: Laptop with Linux Mint 17.3, 1x SSD for system and 2x HDD intended for RAID1 using mdadm Situation: Without knowing how to create RAID1 properly, I created it badly GParted showed a warning ...
3
votes
0answers
43 views

Getting a Windows 7 installation to run virtualized under Ubuntu?

I've currently installed Windows 7 and Ubuntu via dualboot. To avoid switching the OS by rebooting, i want to be able to start my Windows 7 via a virtual machine. It is important to be able to boot ...
1
vote
0answers
92 views

Assistance with mdadm.conf syntax for reassembly of existing RAID0

I'm trying to recover a friends data from a Sony Vaio VGN-AW47GH Laptop. It has a pair of Toshiba MK5055GS 2.5" 500GB HDD combined (according to my reading) into a 1TB RAID0. The laptop is no longer ...
0
votes
0answers
42 views

What can slow down a RAID 5 with 3 disks recovery rate to sub-MB speeds?

I have a RAID 5 on 3 disks 4K aligned (2x WD2001FFSX and 1x WD20EFRX). One of the disks has failed, and i replaced it with an other WD2001FFSX. After partitioning it the same way than the other (1 ...
2
votes
0answers
54 views

CentOS 7: RAID 1 high I/O wait

I am running CentOS 7, with RAID 1 (md) on the hard drives. I have the partitions set as shown below. md0 -> root (sda1, sdb1) md2 -> swap (sda2, sdb2) md3 -> misc (sda3, sdb3) on md3, I ...
0
votes
0answers
41 views

RAID0 worse that write speeds of hard drives independently

So I have two hard drives one connect with SATA and one with USB3.0 SATA (/dev/sdc1): Apple HDD Toshiba USB (/dev/sde2): Western Digital Technologies, Inc. Elements SE Portable ...
1
vote
1answer
29 views

Convert a non-boot single HDD to RAID 1 without deleting it

I bought a second HDD identical size as the one I already have. My goal is to add it to the existing one as a mirror (RAID 1). But I don't have enough space on a system SSD to move data there. So I ...
0
votes
0answers
21 views

Applying a patch to mdadm

I have configured RAID 6 using mdadm, and after trying to add a new disk to the ARRAY (replacing a faulty one), I am receiving the following error: mdadm --manage /dev/md0 --add /dev/sdi mdadm: /dev/...
2
votes
1answer
64 views

Is it possible to create a mdadm RAID10 with both near and far layout options?

How do you create a mdadm RAID10 with both near and far layout options? The wiki indicates it is doable. The "near" and "far" options can be used together... The man pages for mdadm don't ...
3
votes
2answers
145 views

Install mdadm without postfix in ubuntu trusty

I want to build a RAID system on top of Ubuntu Trusty. When I do apt-get install mdadm A screen pop up asking me to configure postfix. Because I will run this installation in automation script. Is ...
0
votes
0answers
45 views

Centos 7.2 Convert single LVM to RAID Mirror Reinstall BootLoader

I am trying to convert a single-drive Centos 7.2 installation with LVM into a two-disk mdadm mirror with mrrored LVM. I was able to follow the excellent instructions at: http://www.dgoradia.com/...
0
votes
0answers
26 views

mdadm does not automount raid0 disks under /media/storage

I've beat my head against this issue all night and I can't seem to wrap my head around it. I've recently installed Linux Mint 17.3 Mate to replace my Windows 10 machine and after some tinkering I've ...
1
vote
0answers
48 views

Debian boot with encrypted disks: RAID is not assembled

Situation I am running Debian 8 on my machine. The disk setup is as follows: # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 55.9G 0 ...
4
votes
1answer
415 views

How do I (re)build/create/assemble an IMSM RAID-0 array from disk images instead of disk drives using mdadm?

The question: Using Linux and mdadm, how can I read/copy data as files from disk images made from hard disks used in an Intel Rapid Storage Technology RAID-0 array (formatted as NTFS, Windows 7 ...
0
votes
0answers
50 views

Mount existing RAID 5 to Open Vault Media but cannot see any file

I have an existing mdadm RAID5 pool with 3 disks running on Debian. When I connect this RAID5 pool to Open Media Vault (OMV), OMV recognise the pool and all information: disks, usage, free space.... ...
3
votes
2answers
61 views

Adding new devices to an mdadm raid10 - new device has fewer sectors

I'm trying to add two new drives to grow a raid10 created with mdadm v3.4 on debian testing with kernel 4.4.6-1. The problem is that the new drives I have have just a few sectors less that the ...
0
votes
1answer
23 views

Automate replacing failed disk in software RAID

Can mdadm automatically recognize a plugged disk as a spare, partition it and add? My config: [root@okvmh2 ~]# lsblk -a NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 ...
2
votes
1answer
260 views

mdadm RAID - Restart during Grow (Shrink) reshape - not working (stuck)

I have a linux software Raid6 array (mdadm). I grew it from 6x4TB disks (16TB usable) to 7x4TB (20TB usable). The reshape went fine, but when I did resize2fs, I got the fairly well known issue of ...
1
vote
1answer
34 views

Hard drive failure at service provider - how to restore/remount data from/on Raid

First I am not a server administrator - and am volunteering to help a non-profit with a crisis. I start from the beginning. The non-profit has a dedicated server contract with 1&1 internet. On ...
1
vote
1answer
191 views

md raid not mounted by dracut

Background I'm running Centos 7. Originally, it was running on a single disk that looked something like this: 1 200M EFI System (/boot/efi) 2 500M Microsoft basic (/boot) 3 465.1G ...
2
votes
0answers
256 views

Install CentOS on RAID (manually) on UEFI system

I'm struggling with the manual configuration of a RAID1 + RAID10. I'm trying the procedure on a VM (VirtualBox 5.0.14 r105127) on OSX 11.10.3. The strategy I took is: The complete set of commands I ...
2
votes
1answer
377 views

mdadm: no devices listed in conf file were found - Debian 8 with GPT

I have a Debian Jessie (3.16.7-ckt20-1+deb8u3) system with RAID1 on 2x 3TB hard drives. Grub can't be installed into MBR on drives >2TB, thus I have GPT with 1MB bios partition: Device Start ...
1
vote
0answers
65 views

Why is uEFI firmware unable to access a software RAID 1 /boot/efi partition?

BIOS firmware can boot a BIOS formatted /boot partition installed on a software RAID 1 pair no problem. It can even boot from a /boot installed on LVM volume that lives on a software RAID 1 pair. But ...
3
votes
2answers
76 views

create raid1 from existing lvm local volume

I have an existing LVM, with one physical drive (say /dev/sdb), and one volume group (say volgrp1), here I have three logical volumes (say lvSys, lvHome, lvSwap). Now I worry about my data and by a ...
1
vote
1answer
284 views

Dependency failed for mount after dist-upgrade

Last weekend, I ran an apt-get dist-upgrade on a home Debian 8.3 system, and was surprised to see that it entered emergency mode on the next boot. The server in question runs LVM on top of a mdadm ...
1
vote
0answers
50 views

MD RAID 5 module doesn't load at boot

I recently upgraded my NAS to kernel 4.4 and now my md raid 5 array doesn't assemble itself at boot. dmesg reveals this: [ 2.299666] md: personality for level 5 is not loaded! and doing lsmod | ...
0
votes
1answer
70 views

raid5 array reassembles as raid0

I found simmilar problem here: Missing mdadm raid5 array reassembles as raid0 after powerout, but mine is a bit different. Here too my raid5 reassembles as raid0, but i don't see any of my devices ...
1
vote
0answers
96 views

Ubuntu Server: How to make bootable bios_grub RAID device?

I have a stable Ubuntu (14.04.3) Server-powered file server that I have set up, and want to set up a RAID10 array for it. For reference, I have been following this guide so far, but using RAID10 ...
3
votes
0answers
62 views

What chunks are mismatched in a Linux md array?

This is a repost of a question I asked on ServerFault and was automatically deleted for lack of activity. Let's hope it will have better luck here. After performing a "check" (by writing check to /...
1
vote
0answers
124 views

lsblk shows non-existent md partitions after reboot

I'm getting weird behaviour while setting up an mdadm RAID1 array on debian 8.2. After I set-up the array, lsblk shows: simon@debian-server:~$ lsblk NAME MAJ:MIN RM SIZE ...
1
vote
1answer
19 views

What happens if Host OS of MDADM md0 crashes

So I am debating getting software RAID. But I am trying to reduce the single point of failure problem. I don't think hardware raid is an option as I can't afford a high-end adapter, and I think I like ...
0
votes
0answers
19 views

mdadm raid 1 array superblock can't be ready

I have a ubuntu linux box, with a raid mirror, 2x3TB using mdadm It's not the system disk, but a raid 1 mirror that contains some files I really need to keep. After power cut, restarted and now ...
2
votes
1answer
27 views

Is there a way to rebuild only part of a disk in an mdraid5 setup?

Last night I accidentally used dd to overwrite the first ~20GB of a drive in a RAID5 array. When I noticed, I repaired the array with $ mdadm --fail /dev/md127 /dev/sdb $ mdadm --remove /dev/md127 /...
1
vote
0answers
70 views

RAID5 needs drive to be added every reboot

I have a 3 disk RAID5 mdadm array total 4TB on an Ubuntu Server 14.04.3 LTS. Since a kernel panic caused by an already replaced device unrelated to the array, after every reboot the array starts [UU_]...
1
vote
0answers
48 views

RAID1 superblock recovery

I have a big issue with my RAID1 array. I transferred my RAID1 (mdadm) to a new PC, but when I was installing it, I rebuilt the array as a RAID0. No data has been written to the disks. When I try ...
1
vote
1answer
28 views

What happens if my RAID fails while the swap is on it?

Today I removed swap from the system drive on my Debian. And created a swapfile on md0. So, I have a RAID1 array for data and a swapfile (the only swapfile). The system with boot partition is on ...
0
votes
2answers
48 views

I'd like to verify mdadm RAID1 is completely fine

Is there some mdadm --verify similar command, which would read all sectors of both disks in RAID1 to truly verify it's fine?
1
vote
0answers
12 views

How to make mdstat ignore specified devices

I have a hypervisor with KVM that uses zvols for virtual machine storage. One such virtual machine was moved from a physical one and has software RAID inside it. Zvols are detected as block devices on ...
5
votes
1answer
159 views

Why does mdadm believe my raid1 “has failed so using --add cannot work”?

TLDR: Trying to add a blank partition to a degraded RAID1 with mdadm 3.3.2 (Debian Jessie) fails, saying the (perfectly working!) array has "failed" and "--add cannot work". Is it telling me of a real ...
5
votes
1answer
529 views

Configuring a mdadm RAID-1 on SSD and HDD

I need to configure a RAID-1 on one SSD and one HDD. Both SSD and HDD has some preinstalled software, which I don't need so both can be fully wiped if that is any advantage. My research so far lead ...
1
vote
1answer
270 views

FIx RAID configuration after upgrade to Debian/Jessie with ICH9 chipset

I upgraded from Squeeze to Wheezy without problems. But after upgrading to Jessie the system cannot boot anymore (using LILO). LILO ERROR: Duplicated Volume ID O 24.1 Loading Linux ....(snip) BIOS ...
3
votes
2answers
245 views

MDADM RAID 0 Failure

Last night I noticed my system clock on my Ubuntu Server was 5 minutes fast so I ran an 'ntpdate pool.ntp.org' command and went to bed. This morning I noticed that SAMBA shares were not working. ...