All Questions
Tagged with mdadm software-raid
105
questions
36
votes
10
answers
238k
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 /...
- 5,790
34
votes
3
answers
207k
views
How do I reactivate my MDADM RAID5 array?
I've just moved house which involved dismantling my server and re-connecting it. Since doing so, one of my MDADM RAID5 arrays is appearing as inactive:
root@mserver:/tmp# cat /proc/mdstat
...
- 2,607
28
votes
4
answers
65k
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 ...
- 1,469
11
votes
3
answers
16k
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 ...
- 60.3k
9
votes
3
answers
4k
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?
- 740
8
votes
3
answers
21k
views
How do I mount a software RAID1 (mirror) created by Windows in Linux using mdadm?
I'm switching my Windows server to Ubuntu and am trying to get my software RAID1 (mirror) that I created in Windows to show up in Ubuntu. I have read that this is possible here using mdadm, but I'm ...
- 972
8
votes
3
answers
7k
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 ...
- 81
6
votes
3
answers
24k
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 ...
- 5,790
6
votes
1
answer
504
views
mdadm: Win7-install created a boot partition on one of my RAID6 drives. How to rebuild?
My problem happened when I attempted to install Windows 7 on it's own SSD. The Linux OS I used which has knowledge of the software RAID system is on a SSD that I disconnected prior to the install. ...
- 191
5
votes
4
answers
15k
views
New mdadm RAID vanish after reboot
I have problems with mdadm after reboot, I can't reassemble /dev/md0 .
I work on debian wheezy.
I have done the following steps::
sudo mdadm --create --verbose /dev/md0 --level=6 --raid-devices=4 /...
- 51
5
votes
2
answers
11k
views
Convert RAID 1 to RAID 10 in mdadm
In my current Ubuntu server, I have 2x 2TB Western Digital RED hard drives in a RAID 1, using mdadm. I would like to add 2 more 2TB RED drives, and convert it to a RAID 10. I realize I would have to ...
- 24.4k
5
votes
0
answers
2k
views
mdadm RAID monitoring no DegradedArray email
So, I have a couple of MDADM RAID arrays and I want to set up monitoring with email notifications for drive failures through sSMTP but I can't seem to get it working.
The system in question is a ...
- 171
4
votes
1
answer
4k
views
MDADM RAID-0 does not increased size after grow on AWS Linux with EBS
I wanted to grew a Raid0 from 2 disks to 3 (each 1TB EBS on Amazon AWS) but the size did not change thereafter. The RAID started with two disks sdc and sdd and the new one was sdf.
Here is the grow-...
- 193
4
votes
1
answer
2k
views
Can I create a degraded mdadm raid10-near (raid 1e) array?
I have three drives in my current system (all 1TB). The current setup is:
sdb - raid0 member (failing soon)
sdd - raid0 member
sde - backup
I'd like to change it so all three drives are part of a ...
- 191
4
votes
1
answer
13k
views
Does mdadm record array event history?
I received an automated email from the mdadm daemon:
A Fail event had been detected on md device /dev/md0.
It could be related to component device /dev/sdh.
I find the wording strange. "could be"? ...
- 358
4
votes
0
answers
3k
views
How to prevent an mdadm array check from consuming excessive system resources?
Once a month I've been doing
echo check > /sys/block/md2/md/sync_action
in order to force a software raid consistency check. The problem is this is a 7.2T RAID 5. The consistency check takes ...
- 181
4
votes
1
answer
758
views
Raid Spare Spin Down
I have a software RAID 5 array (mdadm under Debian Linux) that has been up for the better part of a decade and has seen it's fair share of drive failures. I've always been leery about setting up a "...
- 183
3
votes
4
answers
10k
views
MDADM reshape really slow
To sum up : My raid reshape with mdadm is really slow.
The complete story : 3 days ago I realized that one of my disks from a raid 5 array was faulty. I removed it and replaced it with a brand new ...
- 63
3
votes
1
answer
2k
views
mdadm RAID 1 - spare drive after SATA cable change
Yesterday, my hosting provider changed a SATA cable of one of my HDDs. When my server came back up again, cat /proc/mdstat showed this:
Personalities : [raid1]
md124 : active raid1 sda1[0]
...
- 275
3
votes
0
answers
3k
views
Synology DiskStation: How to stop/interrupt a running reshape (RAID5 -> RAID6)
The short of it: I have a running reshape from RAID5 with 5 disks to RAID6 with 6 disks which needs to be stopped, so I can power off the system. I do not care if the reshape needs to start fresh once ...
- 86
3
votes
0
answers
1k
views
mdadm RAID 1 not activating spare after replacing faulty drive
Have issue with mdadm similar to Simple mdadm RAID 1 not activating spare:
have replaced faulty HDD in RAID 10
fdisked and added new hdd to mdadmn
mdam resynced array
After that I see following:
......
- 131
3
votes
0
answers
185
views
Metadata of the assambled raid inconsistent with the metadata of the individual drives?
We have a raid 10 with two failed drives, with one drive from each set still functional.
When booting into rescue system the metadata seems to be fine and consistent with the expected state.
The ...
- 31
3
votes
1
answer
2k
views
Documentation for mdadm bad block support
I've read a bit about that mdadm (and the kernel) now have bad block support but I am having a hard time finding any useful documentation on this subject.
Is the bad block list for disk X duplicated ...
- 1,260
2
votes
2
answers
20k
views
How do I tell mdadm to start using a missing disk in my RAID5 array again?
I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine.
When I had it all back ...
- 2,607
2
votes
1
answer
4k
views
Assemble 3 drive software RAID5 with one disk missing
Is it possible to assemple a three drive software RAID5 with only two disks? I have one failed disk in my setup which i could not read at all but the two other disks are fine. So i created a dump of ...
- 133
2
votes
2
answers
3k
views
Removing a disk from an Ubuntu mdadm RAID marks the array as inactive, instead of degraded
I'm setting up a mdadm raid 1 array on Ubuntu 14.10 under VirtualBox.
Everything works fine:
The raid 1 is set up with /dev/sdc1 and /dev/sdd1:
Personalities : [linear] [multipath] [raid0] [raid1] [...
- 63
2
votes
2
answers
1k
views
Why make a partition at all for mdadm/raid?
i have 4 disks, sd[a,b,f,g] of various sizes that I want to 'merge' together. I am using mdadm to achieve this.
my question is, what's the difference between --
mdadm --create /dev/md0 --level=...
2
votes
1
answer
5k
views
Degraded RAID5 and no md superblock on one of remaining drive
This is actually on a QNAP TS-509 NAS. The RAID is basically a Linux RAID.
The NAS was configured with RAID 5 with 5 drives (/md0 with /dev/sd[abcde]3). At some point, /dev/sde failed and drive was ...
- 23
2
votes
1
answer
6k
views
Assembling an mdadm array with "possibly out of date" disks
I've recently moved house and have had some power problems after switching on my file server that's using a mdadm RAID5 set up. The file system I'm using is ext4.
It seems that at some point two (of ...
- 21
2
votes
1
answer
3k
views
Auto-rebuild RAID6 with MDADM
I have an openSUSE 11.3 Linux computer with 5 disks of 1TB (WD enterprise disks) in it. With mdadm I configured a RAID6 device.
Now, after a lot of thorough testing, I've noticed that when the ...
- 21
2
votes
1
answer
4k
views
Understanding /proc/mdstat [U_] VS [_U]
My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 (...
- 23
2
votes
2
answers
423
views
Recover from failed recovery of software RAID5 failure
I have the pleasure ;-) to have been handed the task to try to get data off a server that had a RAID5 array problem and a failed attempt to recover it.
Background: the computer in question is some ...
- 21
2
votes
0
answers
143
views
Mounting External Intel Raid Device on Linux Failing, No Suitable Superblock and Read Past End
I have a hard-disk from a dead machine that I'm trying to mount on my Linux machine. For reference, I'm using Fedora 39 and mdadm v4.2. First, I tried just mounting it, correctly showing it's a RAID ...
- 221
2
votes
1
answer
3k
views
mdadm shows inactive raid0 array instead of degraded raid6 after disk failure
I've been running an Ubuntu 18.04 system with an 8-disk raid 6 array, that crashed while having a faulty disk (I only noticed that there was a faulty disk after the crash). The raid array has survived ...
- 21
2
votes
1
answer
943
views
mdadm re-added a removed disk to my RAID1 and skipped re-sycning it, what went wrong?
I ran into what is a true mystery to me today, and would love if someone could give me an idea of how what happened is even possible.
We had physically removed a disk from our software RAID1 (Ubuntu ...
- 31
2
votes
2
answers
2k
views
raid 1 badly detected as raid 0 when one drive is missing
I'm learning raids, so maybe this is some basic question, but it's not covered anywhere...
When I create raid 1, update /etc/mdadm/mdadm.conf as[1], run update-initramfs -u, I can reboot and mount it....
- 583
2
votes
1
answer
534
views
RAID5 mdadm faulty / blk_update_request: I/O error
I have five raw images of a server's disks (stored on one external HDD). Each of those disks contains two partitions which are "Linux raid autodetect" (fd) and are members of RAID1 (boot-related; 3 ...
- 21
2
votes
0
answers
947
views
RAID5 fails while recovering (mdadm): Any chance to resync?
My RAID5 is going to die because, while restoring a failed HDD, on another HDD read errors occurred and a restore is impossible. I just want to know whether it's possible to restore only a part of ...
- 21
2
votes
1
answer
4k
views
mdadm --examine displays something different than --detail
Who should I trust to fill my /etc/mdadm/mdadm.conf ?
mdadm --examine --scan returns /dev/md/0 while obviously it's /dev/md0 that is currently rebuilding
What should I put in my /etc/mdadm/mdadm.conf ...
- 441
2
votes
0
answers
885
views
Redundancy: LVM+mdadm or LVM internal RAID
The task is to create LVM storage for virtual machine images. So LVM will be used in any case.
There are two ways LVM providing redundancy:
block mirroring
lvcreate -m 1 --mirrorlog mirrored -n ...
- 121
2
votes
1
answer
6k
views
Unable to reassemble md raid on drives pulled from ReadyNas Duo v1
I'm toying with a ReadyNAS device that I've recently acquired. It is a SPARC-based box, and it runs linux.
As device is pretty slow, I've pulled one drive out of array, hoping to populate it with ...
- 361
2
votes
0
answers
3k
views
mdadm raid5 read error not correctable
I have a software raid5 setup existing of 4 disks.
sda, sdb, sdc, sdd
Since everything was up and running I wanted to test the array. To do this I pulled the plug on one of the disks (sdd).
Everything ...
- 456
2
votes
2
answers
1k
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, ...
- 121
1
vote
3
answers
9k
views
MDADM raid "lost" after reboot
I am kind of scared right now, so I hope you can bring light on my problem!
A few weeks ago, I bought a new 2TB drive and decided to setup a software RAID 5 with MDADM on my HTPC (drive sdb, sdc and ...
- 315
1
vote
1
answer
747
views
btrfs ontop of mdadm raid - calculating stripes for corrupt sectors for use with raid6check
I've got a setup with btrfs running on top of mdadm raid6 as btrfs's RAID5/6 code isn't stable yet. I figured this way I'd get the benefits of snapshotting and checksumming with a few extra hoops to ...
- 41
1
vote
3
answers
1k
views
Disable warning from mdadm for “degraded” RAID1 with missing drive
I recently had a server outage due to a failed drive. Because of that I set up the server with a new SSD in RAID1 this time but until I managed to get another SSD drive the mdadm-based RAID1 runs with ...
- 845
1
vote
1
answer
2k
views
Software RAID Nonfunctional after power outage
My server lost power yesterday. It automatically booted up when power came back, but my RAID is now nonfunctional.
The RAID array is a software RAID6 built with mdadm. Originally, the array used 8 ...
- 31
1
vote
1
answer
4k
views
Linux MD software raid stripe cache size
From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory.
By increasing this value you can get a ...
- 1,260
1
vote
1
answer
2k
views
Can I pass disks through Hyper-V to a Linux VM for md RAID on any hardware?
I toyed with the idea in the past few months of virtualizing a workstation machine (with ESXi/Xen/etc), basically having it run some very basic server stuff behind the scenes; this was more of an ...
- 235
1
vote
1
answer
9k
views
How can one setup RAID 1 in Linux Mint 13?
I am trying to setup a Linux Mint 13 system using mdadm, with 2 1TB hard drives for a software mirror. I have tried following instructions found for Linux Mint 12, but the instructions fail to mention ...
- 24.4k