All Questions
198
questions
2
votes
1
answer
4k
views
Mounting a raid1 device - no suitable drives found
I'm having some problems with my disks; long story.. but right now I'm trying to mount a device that was part of a 2-disk raid1. For that, I tried to assemble it into a new array, but...
% mdadm -Av /...
CommunityBot
- 1
1
vote
0
answers
56
views
New NAS: Enhancing MDADM against long-term bitrot and random errors [closed]
For the last 15 years I was running MDADM(Raid6)+EXT4 under Ubuntu Server on smaller arrays <25Tb. Typically, all my arrays grow over the years, so I was starting with 4-5 drives and ending around ...
- 48
0
votes
1
answer
50
views
resize2fs wont grow an mdadm array (raid6, lvm, ext4)
I've decided to grow my raid6 array:
- from: 7x 2TB drives (giving usable space of ~9TB in ext4/raid6)
- to: 7x 4TB drives (giving usable space of ~18TB in ext4/raid6)
I have replaced all seven ...
- 18.3k
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
0
votes
0
answers
66
views
Degraded four-drive RAID 5 with missing superblock on single drive
I'll start with the question: Based on the following information, is there a mdadm command I can make in the readyNAS to reassemble all four drives in the raid 5 in a working state where I can pull ...
- 1
6
votes
4
answers
4k
views
Linux software RAID robustness for RAID1 vs other RAID levels
I have a RAID5 array running and now also a raid1 that I set up yesterday. Since RAID5 calculates parity it should be able to catch silent data corruption on one disk. However for RAID1 the disks are ...
- 1,967
0
votes
0
answers
16
views
USB disk on a VBox on RAID was repartitioned
I have an Ubuntu on a VBox on Windows 10 Pro. The Ubuntu had a Raid 1+0 with 2 external USB disks. Suddenly, when I restarted the server, both disks got repartitioned with these: PARTLABEL="...
- 334
2
votes
1
answer
184
views
How to recover a RAID 5 after deleting the partition table and fstab?
I have a RAID5 set up for my storage drives on my Nixos 23.11 machine. I followed this guide to set up the RAID (and I followed it very closely).
I have just reinstalled Linux on my boot drive (...
- 41
0
votes
0
answers
16
views
Using mdadm to perform no-downtime backupd
I have a server running Ubuntu 23.10. It contains several RAID 1 arrays created using mdadm. One of these holds the virtual machine disk images of my web-servers. Currently, to backup these images, I ...
- 1
0
votes
0
answers
54
views
Unable to access data on Intel "fake RAID" after failed Ubuntu update
Recently I did an update of my Ubuntu, it seems to work at first but after restart it shows:
kernell ofset relocation range kernel panic not syncing: VFS
I try to use different older kernel from Grub ...
- 101
0
votes
1
answer
265
views
mdadm grow fails with "mdadm: Cannot add bitmap while array is resyncing or reshaping etc."
We have a RAID-1 setup. We changed the old 1TB disks for 3.7TB disks. The disk changes worked without a problem, the disks are in sync. We did have to change the partition type from MBR to GPT, but ...
- 17
0
votes
1
answer
157
views
UEFI Intel RST RAID issue, can it be solved with MDADM?
I had two disks running on RAID0 on a Gigabyte GA-X38-DQ6. They contained a Windows installation, although not used at all as I was running linux from another SSD disk.
They were running on the Intel ...
- 1,661
32
votes
11
answers
61k
views
Simple mdadm RAID 1 not activating spare
I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin.
The command sudo mdadm --detail /dev/md0 used to ...
- 101
2
votes
1
answer
336
views
Read data from a raid1 disk, superblocks erased
I have a disk that used to be inside my qnap NAS (it was in raid1 with another disk, which I still have). The NAS died and I mounted the disk on my ubuntu machine using mdadm to create the raid array ...
- 560
1
vote
1
answer
3k
views
mdadm device missing
After a reboot my /dev/md0 device was missing. This is a RAID-1 array from two partitions of two harddrives. On each of the harddrives is another partition, which together belong to dev/md1. However, ...
- 56.1k
0
votes
1
answer
178
views
Mdadm raid 5 array is half the size than expected
I crated a Raid 5 array with mdadm consisting of 4 x 4TB drives, i was expecting the array to be 11-12Tb in total space.
But after building the array I noticed it is actuall half the size of the ...
- 6,455
2
votes
0
answers
445
views
Mayhem with partitions and GPT: mdadm RAID overwritten by Windows partition - possible to fix partition table?
dear Community,
I’m writing as I may have wrecked my system up.
I launched disk manager in Windows; as one of my disks was not recognized, and as Windows kindly suggested me to initialize the-said ...
- 21
5
votes
2
answers
4k
views
Does TRIM avoid the performance impact of mdadm RAID 1 on SSD?
It has already been mentioned in other questions that Red Hat recommends against using mdadm RAID 1 on SSD.
Red Hat also warns that software RAID levels 1, 4, 5, and 6 are not recommended for use ...
- 11
0
votes
1
answer
176
views
Recovering RAID 6: drives are ok, but partitions are "lost"
I faced strange issue with my RAID 6 array (8 HDDs, mdadm). Accidentially 3 drives were disappeared from it, with corresponding result - array has been ruined, but - all 8 drives are perfectly fine, ...
- 101
0
votes
1
answer
443
views
Why MDADM removes disk with no errors from array and marks it as failed
I have a Raid6 that keeps automatically marking a disk (/dev/sdi) as Failed and removing it from the array even though the long test does not show any errors:
Test results
sudo smartctl -l selftest /...
- 121
1
vote
1
answer
297
views
Clean up left-over around a RAID5 coming from a QNAP NAS
I just moved a 12TB RAID5 (4 disks of 4TB) from my QNAP NAS into my Linux Server (/dev/md0), and I noticed that there are three "left-over" partitions on each disk (/dev/sd*1, /dev/sd*2, /...
- 31
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
0
answers
131
views
mdadm lost RAID5 after new motherboard and processor
I moved my mdadm RAID5 to a different motherboard/processor, same boot drive.
The array is no longer found during a mdadm --assemble --scan
The motherboard was previously running INTEL RAID, so when ...
- 56
2
votes
0
answers
266
views
Raid6 mdadm reshape operation interrupted - now cannot mount or examine
Edit: Once the reshape finished the drive became fully accessible again.
I had a power failure while a raid6 array was being reshaped, and now certain operations cannot be run against it, including ...
- 279
0
votes
1
answer
2k
views
Remove RAID metadata from HDD so it can be repurposed as a single disk
Previous RAID config was RAID6 in a QNAP NAS, I now want to repurpose the disks as 8 individual disk in different machines.
Each disk appears to have some RAID metadata (superblock) that is stopping ...
- 9,494
1
vote
0
answers
835
views
Restoring/Accessing Synology Raid 1
I was recently asked to try to restore the data from a raid on a synology NAS. The raid consists of 2 disks of 2TB in size. It is a raid 1.
From what I was told, One of the drives has failed and the ...
- 11
3
votes
1
answer
3k
views
Is there a way to show RAID details in a similar way to MDADM?
I find mdadm --detail <device> very useful when I need to know what is going on with the device (/proc/mdadm too).
Example:
/dev/md0:
Version : 1.2
Creation Time : Mon Mar 4 08:35:...
- 287
5
votes
1
answer
538
views
Mount Btrfs raid 5 from failed ReadyNas 104 on Linux - aka how I restore data from my ReadyNas
After about 7 years my ReadyNas finally failed, I would expect from Neatgear detailed recovery instruction, but I read dozens of threads - my problem is not uncommon, but solution was not found.
After ...
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 ...
CommunityBot
- 1
2
votes
1
answer
5k
views
Failed raid1, how to add a new disk with mdadm?
I have a home raid1 with 2 disks and one of them just failed (lightning strike on the house). I'm really unfamiliar with mdadm so I'm asking before doing anything stupid.
I can hot-plug a new HD on ...
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