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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Btrfs distribute files equally across multiple devices

I have a btrfs volume across two devices that has metadata RAID1 and data RAID0. In the event one drive would fail, practically all files above the 64KB default stripe size would be corrupted. As this ...
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14 views

Is it sensible to use multiple LVM layers with mdraid

I'm building up a home server that will be used for a handful of different things. I'd really like to try a Btrfs raid 1 array for a large data store, but I'm using CentOS 7 (older kernel although ...
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13 views

Using Btrfs to eliminate corrupted archives

I am trying to get my personal filesystem in order I want to tar everything and get it organized into proper directories I have many HDDs and a few SSDs I want to use Btrfs with it's checksum and ...
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12 views

Easy tips for optimizing Network I/O? [on hold]

We are a small company doing servers in-house, with (unfortunately) no resources to have a full time server admin. Currently we have 4 servers connected on a 40Gb/s fibre optic network, with ...
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14 views

Debian 8 sytemd “found device” multiple times

I currently run a Debian 8 system (upgraded from Debian 7) with a software raid 1. Once in a while systemd reloads 3 times in a relatively short period and logs it into syslog. If it reloaded only ...
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41 views

218TB XFS LVM filesystem. 144TB Free. Error message “No Free Space Left on Device”

I have a giant 218 TB RAID6, across LVM. It is actually 2 separate RAID6s joined together through LVM to form one giant RAID6. df -h shows all space was available, and I mounted to /share. I wanted ...
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28 views

How should I approach designing my btrfs pool/s? [closed]

I am vaguely familiar with a few COW/modern filesystem concepts, and am nowhere near an expert or even beyond neophyte status when it comes to btrfs. I've just installed Rockstor on a machine I intend ...
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13 views

How to automatically check for failed hard drives in RAID array?

We've got a couple of servers in-house containing hardware RAID5 and RAID6 arrays with 8-15 disks each. What's the easiest way to automatically check for failing hard drives using a script so that ...
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24 views

Using a larger drive in a RAID 1 setup

Is it possible to introduce in a RAID 1 setup a larger drive using its free space for further uses? E.g: What we have: sda - 250 GB HD |-- sda1 - /boot |-- sda2 - / sdb - 500 GB HD |-- sdb1 - ...
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25 views

mdadm raid filesystem differs from disk filesystem

I have created a raid 5 using mdadm on Debian. I used 2 new and 1 "old" disks. The old one had ext3 before. Using "parted -l" I noticed the raid has ext4 as filesystem but the old disk has ext3. I ...
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46 views

High IO wait - How to determine the root cause?

I have a MySQL instance on two dedicated servers. One for the production, the other for the test platform. The 2 servers are pretty the same, the only difference is the RAID controller and the ...
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38 views

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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10 views

Shrinking root partition on Debian

I'm using a headless Debian Wheezy server with 2x3TB disks. It was installed automatically with RAID1. This is the output of df -h: $ df -h Sys. fich. ...
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3answers
122 views

Software RAID 5 and 6 stripe size: why smaller is less efficient?

I read here and then that small stripe size is bad for software (and maybe hardware) RAID 5 and 6 in Linux. The rare benchmarks I saw fully agree with that. But the explanation given by everybody is ...
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29 views

How do I migrate a RAID system to a larger set of HDDS?

All the posts I've found are about moving to new machines or migrating an entire OS from one HDD to another. I don't really know what the hell I'm doing, but I'm apparently the Linux expert. We ...
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1answer
21 views

How do I prepare new drives for use in software raid?

Normally, I create RAID arrays during installation, but I'm trying to add an array to an existing system. The OS (Mint16) is on its own drive. I've added two brand new physical drives to the machine, ...
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29 views

data recovery after partial shred

well i issued the following command: shred -v /dev/sdb. However I wanted to shred /dev/sda. I realized my mistake after about 2gb had been shredded (out of 2.7tb raid volume). what is the ...
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37 views

mdadm refuses to add second identical disk to array

I have a RAID 1 array which is in a degraded state and want to add another drive to it. # mdadm --detail /dev/md1 /dev/md1: Version : 1.2 Creation Time : Fri Mar 21 17:23:00 2014 Raid ...
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change device names in LVM

We have a server crash situation for our Oracle Database Server. The operating system was SLES 10 SP2 and Oracle Release 11.1.0.6.0. Now the system had this setup before crash. 1 boot disk --- ...
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115 views

Software RAID 10 Array Space Loss

I purchased a dedicated server from a hosting company for a forum I am starting and the drives are configured as 4 x 64GB SSD's in a RAID 10 software array. The total amount of space I was expected ...
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27 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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22 views

BTRFS - removing drive by devid instead of path

I recently lost a 5 TB drive using btrfs. I had a system freeze (unsure why) while a balance was running. My SMR drive got corrupted. I was able to mount my array degraded and balance my data. ...
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116 views

Wheezy to Jessie update broke root software RAID, can it be fixed?

Last night I attempted to update my PC from Debian 7, Wheezy (now old stable), to Debian 8, Jessie (now stable). On rebooting, the system broke at 0.267166 minutes into the launch telling me it can't ...
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43 views

How to prevent UDEV rules assigning a device to a specific set of names

I have some UDEV rules for a RAID array; 10 hard disks are assigned names from /dev/sda to /dev/sdj. The disks can be absent at any time. How do I write a UDEV rule to prevent a device such as an ...
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16 views

One disk in RAID setup high usage

I have a system here with 6 disks all same make and model, and on that I have 3 partitions. / RAID 6 /var/log RAID 6 /storage RAID 5 on / I created a swap file instead of partition. With ...
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37 views

Where to install GRUB?

I am running Ubuntu 14.04 on a remote server. It's the only OS installed. I need to be super-cautious before rebooting the machine since KVM access to the server is quite tricky. During a GRUB ...
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29 views

No Raid feature in Redhat Hypervisor

We purchased Supermicro Server "SUPERMICRO CSE-827H-R1400B" . And each of its node has 9TB Storage . And we planned to use this server as a Host for Virtual Machines. So i started to install the ...
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58 views

proper way to stop software RAID before system shutdown

This should be straightforward, but I have been unable to find a direct answer by searching. I find that if I unmount an mdadm-managed array and then either (1) unplug the array, (2) power off the ...
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71 views

ZFS Raid or Hardware Raid in FreeNAS

We bought SuperMicro server "SUPERMICRO CSE-826E16-R1200PB" which will be used for storage. Total HDD 10 - 4TB Seagate HDDs 2 - 60 GB SSDs Now im planning to install FreeNAS on it . And i will ...
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59 views

Raid devices are mounted with different UUID

Centos 7.1 64. This is what I have: Two raids, but not md0 and md1 [root@localhost]# cat /proc/mdstat Personalities : [raid1] md126 : active raid1 sdb2[1] sda2[0] 974711616 blocks super 1.0 ...
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47 views

Debian : Mounting a raid array

I have a Debian system on which we migrated to a SSD for faster execution. Before that we had a 2.0Tb hard disks in RAID. Now we want to use the RAID drives to perform storage generated by the ...
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57 views

Install of manjaro linux on Raid 0

Im trying to install gnome manjaro on my raid 0 ssd's along side my uefi windows 8. The GUI installer proceeds without problems but when I try to boot the system gets stuck on the manjaro load screen. ...
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Running a btrfs RAID 5 array on Arch Linux

For two weeks, I've been trying to run my Raspberry Pi (model B) as root from a btrfs RAID 5 without success. The RAID runs on three 1TB disks /dev/sda, /dev/sdb and /dev/sdc. The three disks were ...
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114 views

mdadm - Can't Remove Components In RADI1

I have my /boot partition in a RAID 1 array using mdadm. This array has degraded a few times in the past, and every time I remove the physical drive, add a new one, bring the array being to normal, ...
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136 views

Required GRUB modules for booting on mdadm RAID1

I have a mdadm-managed RAID1 with a single EXT4 partition on it (having both the OS files and GRUB's files in /boot/grub), and I'd like to know what modules and what configuration do I need for GRUB ...
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1answer
97 views

Resize MDADM/Software RAID underlying partition and filesystem

I am running out of space on my root partition and would like to steal some from a different partition. The drives are 2x120GB with mdadm software RAID. I am using CentOS 6.5 64-bit. I used the centos ...
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118 views

Repairing a RAID5 array

For a friend I'm trying to repair a RAID5 array, consisting of 3 2TB disks. After working perfectly for quite some time, the computer (running Debian) suddenly wouldn't boot anymore and got stuck at a ...
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63 views

Disassemble a RAID 1 arragement without removing/reinstalling the system

I've set up a Soft Raid 1 using Debians built in RAID systems. I set up the raid because I had a space HDD when I set up the server and thought why not. The RAID is set up using what-ever Debian did ...
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119 views

encrypted btrfs RAID1 array fails to mount at boot - open_ctree_failed

I have an encrypted btrfs RAID1 array set up as my /home directory on a fresh install of Linux Mint 17.1. At the Plymouth screen during boot, I enter my password for the two drives, and then receive ...
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29 views

Storing documents and backups on several different drives

Currently I have Ubuntu installed on a 120GB SSD. However I also have 3 more hard drives installed on the computer, 2 x 640GB in aRAID array and a 60GB SSD. What I am trying to achieve is to use the ...
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66 views

RAID 1 on server - need file from mirrored drive

About 3yrs back I had setup an Ubuntu server for a medical clinic. I had set in 2 HDD's for the purpose of having RAID 1 (software RAID) Today suddenly they can't access a table on one of the mySQL ...
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44 views

HW RAID10 without TRIM support with SSD

Recently we purchased new server for Database with 1TB x 4 SSD in Hardware RAID 10, but my Hardward RAID doesn't support TRIM so you think it is going to be big deal? Is there anyway i can do ...
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71 views

How to assemble a specific RAID array without using /etc/mdadm.conf

Is it possible to assemble a specific RAID array using mdadm and its scan-functionality, but without the need for a configuration file? Background: I'm using a custom-made initramfs to setup my ...
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200 views

How mdadm recognizes which device is right one to sync others with

Imagine you have mdadm raid1 with 2 disks. Then you turn off the server, split the disks each one to different machine and boot both of them, so they will become slightly inconsistent Now you turn ...
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89 views

mount mdadm disk without partition table

I've a debian installation and during the installation I had made 3 mdadm raid disk: swap, root and home. I had done it with partman and it had made the mdadm disk without partition table. Now I want ...
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50 views

challenging failed raid5 recovery

I have a personal raid 5 array that is in rough shape. The failed array has eight 2 TB drives that were built up over time in my n-2 desktop machine. The array is from an in-house computer that ...
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48 views

Rebuild linux raid array?

I'm going to be building a media server soon and I want to know how hard it would be to rebuild an array in the event of an ssd failure. Here's what I'm doing. I'm going to have a 128GB SSD boot drive ...
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331 views

Slackware 14.1 software raid kernel panic unable to mount root fs

Trying to install slackware onto a raid 1 on 2 2TB drives. I followed the official readme. I have two drives, sda and sdb. They each have two partitions, one for /(50GB) and one for /home(Rest of ...
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42 views

Looking for a new conf for HA Data Server and Virtual Machines with Glusterfs

I own three HP server for lots of users and email, web and a development machine. I want to make my virtual machines to be available all times, but have some issues. My configuration is as follows: ...
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226 views

Dual Boot Debian on Raid 0 in UEFI mode

My new notebook came from the factory with Windows 8 on two 128GB SSDs in RAID 0 mode. I wanted to dual boot it with a Linux distro, I settled on Debian, so I resized my C: drive as one normally would ...