RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

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Does Simulating mdadm failure require rebuilding entire Array? mdadm -manage -set-faulty

Based on this Article and a few similar others I see how to simulate a mdadm failure, but it seems it's going to require a rebuild of my array. I don't want to give it that much IO and also it took ...
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2k views

Proxmox Master Node crashes

I've inadvertently discovered a Proxmox bug. I run a personal cluster of 4 nodes (a technology lab for giggles and gags). Each node has a Dell Perc 5i and 4 HDDs in RAID 10. The standard Proxmox ...
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solaris svm and raid5 : a way for expand on fly?

I know two methods for expand raid5 on solaris svm using UFS one is this another is to replace disk by disk,suppose i want to remove old small disk and replace with bigger disk using this procedure ...
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1k views

Install Kali Linux on RAID0 (as dual boot Windows 7 & Kali)

I’m currently trying to install Kali Linux on my laptop as described here. The problem is I’ve a laptop (MSI GT70) with a Raid 0 (2x 500Gb) and Windows 7 installed on it. At the point where I’ve to ...
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mdadm 2x Raid 5 missing drives

I'm hoping someone can steer me here with a re-build/sync issue. I have a 3 raid 5's build in mdadm 4 disks in each md0 (Active, degraded), md1 (Active, degraded) and md2 (Clean) -no data on it, so I ...
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Problem Installing UBUNTU 14.04 (AND Mint 16, which is based on UBUNTU 13.10) as dual boot on RAID 0 with Windows 8.1

Ok, I know that there is Dual-Boot Ubuntu 14.04 and Windows 7 on FakeRAID Installation error - question marks "????..." and that that post has some answers for me, but I don't know if it ...
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Error assembling mdadm RAID1 after resizing underlying partitions

I want to shrink a mdadm RAID1 from 2TB to 100GB. This is how the setup looks like before shrinking. root@rescue ~ # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 3.7T 0 ...
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Problem with former RAID hard drive settings in Linux Mint 17

I'm new to Linux, just installed Linux Mint for the first time. I have two hard drives which were previously in a RAID configuration. Now before I have installed Linux I've changed them to individual ...
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bit rot detection and correction with mdadm

I'm about to re-organise all my HDDs in my linux box nas and would like to use mdadm raid for data protection and its flexibility for reshaping the arrays. However, before I use mdadm for this I'd ...
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Can I recover filenames from a failed RAID0 (Linux Debian 5.0.8)

Linux Debian version 5.0.8 is running on my Iomega NAS and it has a RAID0 array of four 3TB disks that failed on the "third" disk. I am aware of the non-redundancy of RAID0 but I would like to ...
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939 views

Can I mount a microsoft mirrored dynamic disk?

I'm testing out sw raid in windows 7, but I almost always use linux and I would like to know if it's possible to mount such a mirrored dynamic disk. I can already mount each members separatly but ...
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435 views

How do I (re)build/create/assemble an IMSM RAID-0 array from disk images instead of disk drives using mdadm?

The question: Using Linux and mdadm, how can I read/copy data as files from disk images made from hard disks used in an Intel Rapid Storage Technology RAID-0 array (formatted as NTFS, Windows 7 ...
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md raid5: translate md internal sector numbers to offsets

TL;DR summary: Translate an md sector number into offsets(s) within the /dev/mdX device, and how to investigate it with xfs_db. The sector number is from sh->sector in linux/drivers/md/raid5.c:...
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2answers
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New RAID array will not auto assemble, leads to boot problems

I had just asked this question where I was unable to boot after installing a new RAID1 Array. I was able to get to the terminal, but once I sorted that out I realized that my problem isn't so much an ...
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2answers
45 views

ZFS messed mirrors up

I have a ZFS pool with 6 drives in RAID10, well it use to... I tried to upgrade a 146GB drive to 1TB drive, and messed up bad root@x7550:~# zpool status pool: stuffpool state: ONLINE scan: ...
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Btrfs adding smaller drive to RAID1

I have a RAID1 btrfs filesystem with 2 2Tb drives, and I had a spare 750 Gb hdd lying around, so I thought I would add it to the RAID so I could use some extra storage. Well, I added it to the volume,...
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32 views

Convert non-raid disk with data into RAID 1 disk (hardware controller)

I moved away from software RAID due to all the hassle it brings. After OS reinstall, I am left with only one drive. I ordered a hardware RAID controller today, and when the controller arrives, I'd ...
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44 views

What can slow down a RAID 5 with 3 disks recovery rate to sub-MB speeds?

I have a RAID 5 on 3 disks 4K aligned (2x WD2001FFSX and 1x WD20EFRX). One of the disks has failed, and i replaced it with an other WD2001FFSX. After partitioning it the same way than the other (1 ...
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1answer
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mkswap complains that partition is misalilgned (LVM on RAID-0)

I have a RAID-0 setup on two identical hard disks (same brand and model). The partition table is identical on both (I have cloned it). However, /dev/md0 occupies only part of the disks, because I had ...
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Adding 2 HDDs as mirroning on existing OS (centos)

I have a NAS with 2 x 1TB HDDs and I added two new HDD-s: Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes ...
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HW Raid - Centos 5 - Boot Issues

I am totally lost as to how to fix this or what to do, I am about to just removed the raid all together. (Work stuff though, so Id rather not)\ I have a tower with 4 drives in it. 2 seperate raids ...
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RAID0 worse that write speeds of hard drives independently

So I have two hard drives one connect with SATA and one with USB3.0 SATA (/dev/sdc1): Apple HDD Toshiba USB (/dev/sde2): Western Digital Technologies, Inc. Elements SE Portable ...
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Applying a patch to mdadm

I have configured RAID 6 using mdadm, and after trying to add a new disk to the ARRAY (replacing a faulty one), I am receiving the following error: mdadm --manage /dev/md0 --add /dev/sdi mdadm: /dev/...
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RAID: ZFS or Btrfs?

I've mounted my own NAS with ArchLinux on an old HDD. I want to add 3x4To to have real storage capabilites and I would like to use a RAID5 system with these 3 disks. I've read a lot about ZFS Raid-z ...
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1answer
66 views

Is it possible to create a mdadm RAID10 with both near and far layout options?

How do you create a mdadm RAID10 with both near and far layout options? The wiki indicates it is doable. The "near" and "far" options can be used together... The man pages for mdadm don't ...
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Is there a way to mount two folders into one mounting point, so that folders are mirrored?

I want some tool like $ mirroring_mount ~/first_location ~/second_location ~/mount_point So, when I edit file in ~/mount_point, it is edited in both locations, and if ~/first_location and ~/...
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271 views

ServeRAID error in syslog, is it important?

I was checking the logs in server when i came across this message. Nov 4 12:52:05 SERVERNAME ServeRAID Manager Agent: [338] Periodic scan found one or more critical logical drives: controller 1. ...
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18 views

RAID1 speed limit

I've got a RAID1 with two SATA drives in SATA-USB-Adaptors. One is USB 3.0, one is USB 2.0. Does the USB 2.0 limit the write speed of that array?
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Partition on raid array incorrectly states it is full

Sorry if this is the wrong place to post this question. I have a small home media (samba) server, which has a software (mdadm) raid10 array, with 4 disks, each being 3TB. It has only one xfs ...
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How to mount a disk from destroyed raid system?

I have a horrible situation where I have to restore data from damaged raid system in a rescue Debian Linux. I just want to mount them all to /mnt/rescue in read only modus to be able to copy VMWare ...
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Merge contents of two partitions into one singular partition

I have a machine that has a 20GB FS at /dev/md1 mounted on /, and a ~200GB FS at /dev/md2 mounted on /home. A large amount of data will soon be stored in /var. How can I merge these two partitions ...
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2answers
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RAID1 vs rsync - security?

I'm setting up a NAS-Server using an Odroid XU4 and two 2TB HDDs. Which setup would be more secure (lower risk of losing data / easier recovery): setup a RAID1 with mdadm have two separate devices, ...
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mdadm does not automount raid0 disks under /media/storage

I've beat my head against this issue all night and I can't seem to wrap my head around it. I've recently installed Linux Mint 17.3 Mate to replace my Windows 10 machine and after some tinkering I've ...
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1answer
59 views

Seeing much less usable space than expected with new volume using ZFS on Centos 7

I have a monster server I'm provisioning at the minute. There are 15 x 8TB HDD's connected to a SATA interface card that I'm using to create a ZFS volume. The drives are all detected and I've got the ...
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1answer
23k views

How to get details of RAID devices both soft and hard?

I want to check if my server has RAID configured both soft and hard. I tried some commands on my server (Suse Enterprise Edition 11): **ms:~ # cat /proc/mdstat Personalities : unused devices: <...
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50 views

Debian boot with encrypted disks: RAID is not assembled

Situation I am running Debian 8 on my machine. The disk setup is as follows: # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 55.9G 0 ...
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163 views

Replacing a failed disk in a ZFS pool

I've got a large ZFS disk pool; 3 nested RAIDZ2 vdevs. I am documenting the process for replacing a failed disk for my colleagues and so simulated a disk failure by removing a disk from the host. ...
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Mount existing RAID 5 to Open Vault Media but cannot see any file

I have an existing mdadm RAID5 pool with 3 disks running on Debian. When I connect this RAID5 pool to Open Media Vault (OMV), OMV recognise the pool and all information: disks, usage, free space.... ...
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Checking for a failed drive in a ZFS pool

I'm testing a large ZFS pool at the minute and am documenting the process for replacing a failed drive before our environment moves into production. I've built the ZFS volume 'diskpool', which is 3 ...
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1answer
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Does RAID 0 have a performance gain even on a low resource OS like Ubuntu or Mint?

I have Windows 10 installed on raid 0 right now but I was thinking about wiping it and installing mint. I already have an i7 3770, 24gb ram and a 250gb ssd. Would there be any improvement by ...
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1answer
268 views

mdadm RAID - Restart during Grow (Shrink) reshape - not working (stuck)

I have a linux software Raid6 array (mdadm). I grew it from 6x4TB disks (16TB usable) to 7x4TB (20TB usable). The reshape went fine, but when I did resize2fs, I got the fairly well known issue of ...
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Checking Hardware RAID status Live

I want to check the Hardware RAID status of my host. I know there is a way to check it from the Server Vendor has their own command line utility for checking the performing of all the physical devices....
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Install CentOS on RAID (manually) on UEFI system

I'm struggling with the manual configuration of a RAID1 + RAID10. I'm trying the procedure on a VM (VirtualBox 5.0.14 r105127) on OSX 11.10.3. The strategy I took is: The complete set of commands I ...
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Why is uEFI firmware unable to access a software RAID 1 /boot/efi partition?

BIOS firmware can boot a BIOS formatted /boot partition installed on a software RAID 1 pair no problem. It can even boot from a /boot installed on LVM volume that lives on a software RAID 1 pair. But ...
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34 views

Hard drive failure at service provider - how to restore/remount data from/on Raid

First I am not a server administrator - and am volunteering to help a non-profit with a crisis. I start from the beginning. The non-profit has a dedicated server contract with 1&1 internet. On ...
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RAIDing with LVM vs MDRAID - pros and cons?

In his answer to the question "mixed raid types", HBruijn suggests using LVM to implement RAID vs the more standard MDRAID. After a little investigation, it seems LVM also supports RAID ...
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84 views

ZFS Mirror on same drive for redundancy?

The device I would like to use as a home server has only a single 2.5'' internal hard drive bay currently fitted with 1TB. The actual data storage (2x 1TB) will be attached to the external USB 3.0 ...
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38 views

How to configure RAID 1 from Recovery Mode?

I have a server is composed from two HDD 1500 GB SATA (/dev/sda and /dev/sdb), one of this have failed and server is in recovery mode. I want to fix it, first I made a backup of the important ...
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253 views

Ubuntu 14.04 software RAID with LVM install won't boot on bare metal

If I setup a VirtualBox guest with two 30 GB virtual hard disks and follow the following steps, the result will be a fully functional, booting operating system: Boot Ubuntu 14.04 Server install CD ...
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Btrfs: available space not used after migrating from RAID1 to RAID6

I had 8 2TB disks running in a RAID1 setup but it started to get full so I converted it to a RAID6. However, it seems I can't use the space I've gained by switching to RAID6. My filesystem is pretty ...