All Questions
Tagged with mdadm software-raid
105
questions
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