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Questions tagged [mdadm]

a utility to administrate Linux Software RAID devices

513 questions
48
votes
1 answer

I don't have a RAID but get the warning mdadm.conf defines no arrays

I installed 16.04 Server and I have had a similar message in my logs and this message when I upgrade initramfs packages through normal package upgrade. ... Setting up initramfs-tools (0.122ubuntu8.3) ... update-initramfs: deferring update (trigger…
Paul
  • 4,606
31
votes
6 answers

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 - v3.1.4 - 31st August 2010 ~$ sudo mdadm --detail…
Zaz
  • 1,129
30
votes
4 answers

Why is my RAID /dev/md1 showing up as /dev/md126? Is mdadm.conf being ignored?

I created a RAID with: sudo mdadm --create --verbose /dev/md1 --level=mirror --raid-devices=2 /dev/sdb1 /dev/sdc1 sudo mdadm --create --verbose /dev/md2 --level=mirror --raid-devices=2 /dev/sdb2 /dev/sdc2 sudo mdadm --detail --scan returns: ARRAY…
mmorris
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24
votes
5 answers

Can the EFI system partition be RAIDed?

I'm setting up a HTPC with Ubuntu 64-bit, using UEFI and RAID with GPT disks. Is it possible for the EFI system partition (partition type 0xEF00) to be part of a RAID1 array using mdadm? I'm hoping that metadata version 1.0 (at the end of the disk)…
Andrew
  • 507
22
votes
4 answers

How can I create one logical volume over two disks using LVM?

Hi. I've got a working Ubuntu 12.04 server, which is going to serve as media server. I've added two disks of size 3TB to put my data on, and I wish to combine these as one 6TB logical volume which I could mount under /media. So far, I have created…
Hydrosine
  • 323
21
votes
4 answers

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 Oct 20 20:00:41 2010 Raid Level : raid5 …
Jorge Castro
  • 73,717
19
votes
3 answers

How to Install Ubuntu 14.04 with RAID 1 using desktop installer?

Many people claim that it is impossible to install Ubuntu onto RAID 1 with the Desktop CD. Is this really true? If not, how can it be done?
Sunday
  • 803
19
votes
9 answers

Making stripe_cache_size permanent

I did echo 8192 > /sys/block/md0/md/stripe_cache_size to improve my RAID performance, and it did helped alot. But I still can't figure out how to make it permanent. I was trying to set it in /etc/rc.local - other commands are executed, but it was…
BarsMonster
  • 549
18
votes
2 answers

RAID (mdadm) - What happens if drives are mismatched in size?

Question 1 - Before you answer with "it just takes the smaller disk", hear me out quick. My 3TB WD Reds come out to be 3001 GB in size. Let's say I set up a mirror via mdadm for sdb1 and sdc1 which span 100% of the drive. But suddenly, one of the…
JaSauders
  • 567
16
votes
4 answers

How to enable degraded RAID1 boot in 16.04LTS?

In previous ubuntu versions, adding BOOT_DEGRADED=true to /etc/initramfs-tools/conf.d/mdadm allowed the system to automatically boot when the root filesystem is on a degraded array. This no longer seems to work in 16.04 LTS. The documentation…
vdyvp
  • 161
16
votes
1 answer

Setting up RAID 1 on 14.04 with an existing drive

I have a currently installed Seagate ST3000DM001 (about 90% full) and a new Seagate ST3000DM001 (blank). I would like to setup RAID 1 without losing the data on my currently installed drive. If I use the mdadm process outlined in this tutorial:…
Shayne
  • 165
16
votes
1 answer

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 Windows but are unable to mount the partitions. We can…
Neil
15
votes
2 answers

How to re-add accidentally removed hard drive in RAID5

I have a NAS on Ubuntu Server with 4 2TB hard drives in RAID 5. A couple of weeks ago, one of the hard drives died, but my RAID was working, although degraded. Luckily it was still under warranty and I was sent a new hard drive which I installed…
Chunky56
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14
votes
1 answer

Software raid - mdadm - re-find my array

Description Today I plugged in another hard drive and unplugged my raid drives to ensure when I wiped the drive, I would not accidentally pick the wrong drives. Now that I have re-plugged in my drives, the software raid 1 array is no longer being…
Programster
  • 6,039
14
votes
3 answers

Put HDDs in standby after X minutes using hdparm doesn't work

I use Ubuntu 12.04 on a home server. There are 5 hard drives: one SSD with the OS and 4 HDDs (Samsung HD204UI) configured as a RAID5 using mdadm. I don't need the RAID very often (say, about once per day in average); it contains multimedia data and…
leemes
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