Questions tagged [raid6]

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Activate inactive RAID6

Ubuntu 22.04.3 LTS I have mdadm RAID6 with 4 drives. This is a minimal test configuration before extending it to target 8 drives. RAID was in working state: cat /proc/mdstat Personalities : [linear] [...
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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 ...
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Managing raid6 device with pacemaker

I am setting up 4 hosts, each exporting one local storage device over iscsi with target. Every other hosts imports it such that each host has concurrent access to all 4 each storage devices. I built a ...
Nykau's user avatar
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Cannot stop md raid6 array

I setup a raid6 array on top of iscsi and lvm shared logical volumes that I use to make sure only one node part of iscsi network can use the raid volume at a time. Today I fail to stop the volume. ...
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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 ...
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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 /...
Jorge's user avatar
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Growing RAID6 (mdadm) including update of stripe-width

I am running Debian Bullseye (OpenMediaVault 6) with backports kernel 6.0.3-1. I have set up a RAID6 array consisting of 4x 6TB Seagate Ironwolf HDDs (4KiB sectors with 512KiB emulation). When I have ...
bash0r1988's user avatar
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Recovery of scp overwritten file

I had two 2GB txt files a.txt and b.txt that I wanted to copy to another directory using scp. However I accidently didn't type the destination directory and typed the following commands scp *.txt and ...
asalimih's user avatar
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Semi-failed RAID6, still able to copy data but incredibly slow

I had a 5-drive software raid6 with mdadm setup (2 parity drives), and a drive failed. I ordered a replacement, and when I powered off the machine to swap the failed drive with a new one, ANOTHER ...
Russ's user avatar
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Up to which point (disk size) is Raid 6 safe to use? [closed]

I have been reading a lot of warnings about Raid-6 becoming less and less safe to use due to the storage amount per disk as well as array sizes increasing. What are the best practice limits/when does ...
user2693017's user avatar
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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 ...
Matthew Weigand's user avatar
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1 answer
2k 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 ...
D.F.'s user avatar
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Strange issue with Dell PowerEdge R610 hard drive status lights

I setup a test FreeNAS server the other day on a spare Dell PowerEdge r610 and noticed that the hard drive activity LEDs are always both lit no matter what the server is doing. I have 6 1TB 7.2k SAS ...
Richie086's user avatar
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Btrfs volume missing

I have an Ubuntu 64-bit Server with 7 4TB HDD's in a Btrfs Raid 6. A few days ago I executed the btrfs balance command but forgot that this takes quite a while. 'Cause of an update, I restarted my ...
hewu's user avatar
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What is reserved space used for in HP MSA 1000 controller

I have configured the HP MSA 1000 by making a RAID level 6 comprising of two pools of 24 TB each. I dont understand why 16 TB is used as the reserved space and what is its purpose? How can i utilise ...
Hassan Abbas's user avatar
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3 answers
10k views

Btrfs over mdadm RAID6?

I have a Btrfs RAID 6** array, and I currently have enough free space to rebuild it to avoid the data loss bug that currently affects the filesystem with this RAID level. My idea is to rebuild the ...
Benjamin Dubois's user avatar
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how to force mdadm to sync to device after raid6 repair and how to get number of errors?

The Question After a component device suffered unexpected bit-flip, and after a raid6 repair was successfully performed on the raid device, how to force mdadm to sync the changes from buffer(?) back ...
Max-Julian Pogner's user avatar
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1 answer
631 views

LVM2 RAID6 CentOS 7 not working

I have a server with 4 spare 6 Tb disks. I want to set up RAID6 on these four disks. It is well understood that 4 is the minimum one needs to set up RAID6. No matter what I pass to LVM2, I get ...
volvox's user avatar
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RAID 6 and adding new drives possible?

Im building my first server box for backups and music/movie storage. My backups are VERY important [im a photographer, over 1TB in raw images, .psd's]. So i finally got 4 - 3TB drives. i have a ...
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Fail device in md RAID when ATA stops responding

I had created five 1TB HDD partitions (/dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sde1, and /dev/sdf1) in a RAID 6 array called /dev/md0 using mdadm on Ubuntu 14.04 LTS Trusty Tahr. The command sudo mdadm ...
Deltik's user avatar
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Online Drive Replacement: BTRFS with RAID 6

on a testing machine I installed four HDDs and they are configured as RAID6. For a test I removed one of the drives (/dev/sdk) while the volume was mounted and data was written to it. This worked well,...
Oliver R.'s user avatar
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1 answer
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mdadm: Reactivating RAID6 array after improper shutdown

I have a seven-disk RAID6 array on a file server. The server experienced a crash and a hard reset was required, resulting in an improper shutdown. Note that I/O activity was likely occurring on the ...
nonoitall's user avatar
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2 votes
2 answers
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Is it possible to convert a btrfs RAID5 to a RAID6 with the same disks without losing data?

How would I convert an existing RAID5 (single parity) btrfs setup to a dual parity RAID6 configuration given enough free available disk space, using the same disks, without swapping out data ? ...
Arc's user avatar
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7 votes
3 answers
3k views

Is RAID1 or similar needed for btrfs/ZFS to protect against bit rot?

I'm running a file server using Linux software raid, set up as raid6. As filesystem I've chosen btrfs. However, I'm not using btrfs own raid6 implementation as it's not very stable yet. So basically, ...
user333556's user avatar
7 votes
2 answers
6k views

Why does RAID 6 require at least 4 disks?

For a non-degraded RAID 6 array, why do most implementations and documentation require at least 4 drives? Why can't it have 3 disks, for 1 data and 2 parity blocks per stripe? Why force a minimum of ...
BeowulfNode42's user avatar
5 votes
1 answer
12k views

Windows Server Software RAID 6

I want to set up a software RAID 6 configuration, but in Windows Server 2008 it only lets me do up to RAID 5. In Server 2012 I saw they have this new thing called "Storage Spaces" which sounds neat, ...
Nalandial's user avatar
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13 votes
4 answers
92k views

Can RAID 1 have more than two drives?

Recently I had a discussion with a teacher of mine. He was claiming that you could set up RAID 1 with five drives and that the data would be mirrored over all of these drives. I told him a RAID 1 ...
Mad_piggy's user avatar
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1 answer
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mdadm: superblock on /dev/sdd1 doesn't match others - assembly aborted

OS: Debian Squeeze Kernel: 2.6.32-5-amd64 mdadm version: 3.1.4 (31 August 2010) mdarrays md1 = raid1 (this is working) (devices: /dev/sd[fg]1) md0 = raid6 (previously raid5, ...
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