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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 ...
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9 views

Growing an mdadm RAID array with differently sized disks

I have a raid6 archive array made up of 4 2TB drives (+OS on an independent SSD). I'm starting to run out of space and my target final goal is 4 4TB drives. I don't have enough SATA ports to run both ...
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1answer
72 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 ...
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1answer
30 views

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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1answer
188 views

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 ...
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1answer
227 views

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,...
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1answer
156 views

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 ...
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1answer
463 views

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 ? ...
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768 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, ...
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2answers
1k 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 ...
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1answer
5k 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, ...
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2answers
21k 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 ...
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1answer
4k views

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, ...