All Questions
Tagged with mdadm software-raid
105
questions
2
votes
0
answers
110
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
0
votes
0
answers
31
views
2 Disks Suddenly Showing as Spares on Raid 5 Array
I have a raid5 array in a Seagate Blackarmor 440 nas that suddenly started showing disks 1 and 4 as "failed". I moved all of the drives over to a Ubuntu box and tried to assemble the array ...
0
votes
1
answer
346
views
How to wait for mdadm RAID1 resync process to fully complete?
I currently have a logic to wait for the resync process to finish by looking at /sys/block/mdXXX/md/raid_state to be clean and assume that the resync has finished. However, I don't think this is ...
1
vote
0
answers
155
views
How do I eliminate file write latency spikes on mdadm raid0?
High Level Problem Summary
We are working on an application that requires high throughput to RAID0 for extended periods of time. There are up to 8 independent 5 GB/s data streams being written to ...
- 111
0
votes
0
answers
240
views
Mount & Access DATA in RAID1 configured HDD outside of Synology Box on Linux [mount: wrong fs type, bad option, bad superblock]
Background
My Two-Disk Synology DS14+ won't power on and I want to access the files stored in the HDDs on my Ubuntu computer. I tried following the official guide on Synology's FAQ but I always get ...
- 1
1
vote
0
answers
37
views
Assemble raid6 array from spares only
This question is related to Managing raid6 device with pacemaker, but nothing in the question linked is relevant to this question, except the fact that Pacemaker is involved.
For the purpose of this ...
- 63
0
votes
0
answers
173
views
Raid 10 gone - how to rebuild / find informations
Because of another task, i had to disconnect all the raid hdd's from my pc.
Shutdown -> disconnect hdd's -> boot -> shutdown -> connect hdd's -> boot -> raid completely lost.
mdadm --...
- 101
0
votes
2
answers
3k
views
How to restore my RAID5 after mistakenly failing one of the drives?
I have a RAID5 on Xubuntu 20.04, created with mdadm. I failed one of the three drives by mistake. The array is still working, but I get errors or responses I do not understand from my attempts to ...
- 183
0
votes
0
answers
6k
views
Improve mdadm RAID5 with SSD Cache
I have the following Setup:
3x 3 TB SATA HDD
With software raid connected to a RAID5
On top of this LVM for snapshots (backup)
And on top of LVM EXT4 formatted.
Actually around 400GB is used.
I have ...
- 227
0
votes
1
answer
184
views
raid 4 3 disks + 2 parity disks
I have a raid 0 with 3 disks and I want to be able to lose some disks without losing data.
I'm using mdadm and I already started to grow my config
Current config:
Personalities : [raid0] [linear] [...
- 13
1
vote
1
answer
129
views
My Software RAID 5 has 4 3TB HDDs, now two of them have bad sectors. What is a good way to replace them?
I run mdadm on Ubuntu 18.04 to build a RAID 5 array of 4 3TB drives several years ago. The machine was not running for years. Yesterday I powered it on and found two of the disks have a bunch of bad ...
- 123
0
votes
1
answer
218
views
How to reshape a 2-disk RAID1 into a 2-disk RAID5 using mdadm?
According to How to remove a drive from a non-standard 2-drive RAID 5 array?, "with mdadm, a 2 drive RAID 5 is binary identical to a RAID1". If that is so, what's the mdadm command line for ...
- 105
1
vote
1
answer
169
views
How long should RAID 10 syncing stay at 'recovery = 99.9%'?
After replacing a faulty disk in a (CentOS 7) RAID 10, the syncing is at the following stage for quite some time now; it has had this state for more than a day:
md10 : active raid10 sdp1[9] sdo1[8](S)...
- 1,153
1
vote
1
answer
616
views
Way to monitor progress of RAID10 rebuilding disks, when RAID does not show in /proc/mdstat?
I have an inactive RAID 10, and the output of mdadm --assemble --scan -v |& tail -17 is:
mdadm: /dev/sdn1 is identified as a member of /dev/md/10, slot 5.
mdadm: /dev/sdk1 is identified as a ...
- 1,153
1
vote
2
answers
2k
views
mdadm - Raid 1 arrays do not assemble after reboot
I rebooted my server after creating 3 raid 1 arrays with mdadm, and after rebooting, systemd was spitting out errors about the raid devices timing out when trying to assemble them at boot.
I was given ...
- 2,984
0
votes
1
answer
576
views
What does delta devices of the mdadm--detail output mean?
Here is an output of mdadm --detail:
$ mdadm -D /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Wed Jun 24 16:41:17 2020
Raid Level : raid5
Array Size : 7809195456 (7447.43 GiB ...
- 123
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
0
votes
1
answer
387
views
Long-term local offline RAID storage of never-changing data
I have about 20TB of data that will remain unchanged (forever) and I am planning to make offline copies with a little redundancy.
I already have a lot of 2TB drives that I plan on using and I am ...
0
votes
0
answers
255
views
mdadm.conf: mdadm -E --scan *vs* mdadm -D --scan, which is correct to use?
I have two questions:
It's not clear which flag to use when generating mdadm.conf.
I've seen people and documentation use
mdadm -E --scan
I've also seen mdadm -D --scan.
Which is correct to use?
...
- 1
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
0
votes
1
answer
833
views
Can a mdadm software RAID 1 drive be accessed independent of the other drive in the array?
I'm doing research for a project I'm starting, so I cannot provide configuration here. Say I have a software RAID 1 array configured between two drives with mdadm.
If I write data to the array and ...
- 687
0
votes
1
answer
46
views
I added 5 drives to mdadm raid array, then I noticed 3 had partitions on them already. What is going to happen?
I have a 15 drive raid6 array using MDADM on ubuntu linux 18.04.2 server. I installed 5 more drives and added them to the raid array, and it started reshaping. However, after that I noticed that three ...
1
vote
1
answer
741
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
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
935
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
1
vote
2
answers
3k
views
mdadm raid cretion: apparently superblock not written to disk
I am in exactly the same predicament as MDADM raid “lost” after reboot:
I followed this giude to setup a raid-1 array with two disks (I was working in a recovery shell, so no "sudo"):
mdadm --create ...
- 551
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
1
vote
1
answer
612
views
File system corrupt after re-adding software RAID 1 member after test. Why?
A colleague and me set up a software RAID 1 with mdadm consisting of two physical disks, with two partitions on the virtual device. The set up went fine, and booting directly from one of the RAID ...
- 131
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
0
votes
0
answers
116
views
Computer crashed, raid array in trouble
I arrived home today to find my home server was off (not idea why). Turned it back on again and the raid array was failing to mount.
/proc/mdstat shows:
Personalities :
md0 : inactive sdh[7](S) sdc[...
- 1
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
0
votes
1
answer
271
views
Would it be advisable to have 2 raid-1 (mirror) using just 2 physical drives compared to just 1 raid-1 on 2 physical drives?
I'm using 2-bay drive Synology (implies I'm using linux mdadm software based RAID system).
The motivation for doing so is to lessen the time rebuild RAID-1 array after it goes degraded. I currently ...
- 667
2
votes
1
answer
533
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
3
votes
0
answers
182
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
0
votes
2
answers
648
views
What happens when you remove a drive from linux raid?
I have a home media server that gave me a message today saying one of the drives is soon to fail (not happy, still under warranty, that's another issue)
I am running Mdadm raid 0 on a 3 drive system ...
- 153
2
votes
0
answers
939
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
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
0
answers
541
views
One RAID1 missing after reboot
I'm using Open Media Vault 3 that is based on Debian 8.
I already have a RAID1 of 2x4TB WD Caviar Red, and now I'm tring to build a RAID1 with two Seagate Ironwolf 6TB.
Whe I build it anything is ...
- 21
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
757
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
0
votes
1
answer
190
views
AMD SP5100 Raid 0 rebuild
I was using an onboard AMD SP5100 raid controller for a Raid 0 on two 1TB drives. The motherboard has failed. I have two questions - firstly if I replace with an identical motherboard, will I be able ...
- 1
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
0
votes
1
answer
83
views
Software RAID0+1 using 3 disks
Is it possible to use mdadm to do RAID0+1 using 3 disks?
My scenario is 1x2TB disk and 2x1TB disks. Not interested in the RAID0 performance boost, just want to combine them so I can mirror them with ...
0
votes
1
answer
78
views
Need to recover RAID0 disks from failed linux box
I have two drives from a failed old Linux box that were configured as RAID0.
I have created two dd image files using the following commands on my Mac:
dd if=/dev/disk3 of=disk0.img.dd bs=512
dd if=/...
0
votes
2
answers
259
views
RAID0 data recovery & recovery strategy validation
I have a Synology expansion (DX213) connected to my NAS. It houses 2 disks of 2TB and they are in a RAID0 configuration (awful idea, I know and I don't need a reminder ;) ). Last weekend, the array ...
- 101
0
votes
1
answer
45
views
Linux software Raid5 DegradedArray with mdadm
So I changed my case and I don't know why but one my SATA port does not work anymore. So only 5 of my 6 RAID5 disks were recognized. The volume was automounted anyway and I already wrote new files on ...
- 25
0
votes
1
answer
186
views
Unable to assemble mdadm array due to lack of errors
My virtual machine host system is running Debian 8.4. I had to restart the system yesterday and did not yet manage to get my mdadm array up and running again. I can boot up normally, but no array (or ...
- 1
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
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
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