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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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
10 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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21 views

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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1answer
16 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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13 views

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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2answers
24 views

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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3answers
43 views

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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12 views

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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0answers
19 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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+50

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 ...
0
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1answer
54 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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0answers
24 views

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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1answer
20 views

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 ...
2
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1answer
54 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
25 views

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 ...
2
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1answer
117 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 ...
5
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0answers
49 views

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 ...
1
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1answer
27 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 ...
2
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0answers
141 views

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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0answers
44 views

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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1answer
27 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 ...
0
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1answer
123 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 ...
2
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1answer
41 views

Install Linux on RAID system or outside in separate partition?

I have a Linux box with 4 HDDs which I will configure as RAID5. Should I install Linux rootfs on a partition ontop of the RAID or should I first build a partition on one of the bare disks and then ...
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2answers
91 views

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 ...
3
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1answer
102 views

BTRFS, RAID5 and the minimum number of drives required

It's been my understanding that in order to have a RAID5 setup, one would need to incorporate a minimum of three drives. Basically (and probably poor paraphrasing) two blocks of data and a block of ...
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0answers
12 views

Archlinux Raid Setup

So I want to setup a raid setup with 2 drives but I want to have the possibility to upgrade along the line. I watched a video on Linus Tech Tips today and saw he used a Raid card with 2 SAS ...
2
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1answer
56 views

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 ...
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0answers
45 views

Why does my RAID array keep changing names?

I have my Linux system on my SSD, and have 2 1TB HDDs set up as a RAID-0 array (for some reason it's named "Raid 0", I don't like the fact that the person who set it up put a space in the name instead ...
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0answers
59 views

Ubuntu Server: How to make bootable bios_grub RAID device?

I have a stable Ubuntu (14.04.3) Server-powered file server that I have set up, and want to set up a RAID10 array for it. For reference, I have been following this guide so far, but using RAID10 ...
3
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1answer
205 views

Recover LVM (on RAID1): No volume groups found. Partition table erased?

I'm trying to recover a LVM (no encryption) on a RAID1 using Debian Live. Apparently, the RAID1 can be assembled without issue, but the LVM is broken. You may skip to LVM section. The RAID part is ...
3
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0answers
37 views

What chunks are mismatched in a Linux md array?

This is a repost of a question I asked on ServerFault and was automatically deleted for lack of activity. Let's hope it will have better luck here. After performing a "check" (by writing check to ...
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1answer
50 views

Software RAID using network shares as drives

Disclaimer: This is probably crazy from a performance point of view, also from a reliability point of view, and maybe only of academical value (as in: would it work at all?). That being said: Will ...
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0answers
78 views

lsblk shows non-existent md partitions after reboot

I'm getting weird behaviour while setting up an mdadm RAID1 array on debian 8.2. After I set-up the array, lsblk shows: simon@debian-server:~$ lsblk NAME MAJ:MIN RM SIZE ...
3
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0answers
58 views

BTRFS has become unmanageable

I'm struggling with a btrfs RAID0 filesystem. It's expanded on 4 disks but i need to remove one of those disks. This is the current status of the filesystem: [root@osgiliath detlev]# btrfs fi show ...
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2answers
43 views

In Linux what setup would allow striping data across multiple drives?

How would a system be set up to stripe data like raid does, preferably with out using raid. Could lvm be used for this?
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0answers
26 views

HowTo Suspend / Sleep / Spin down disks in RAID - Creted by the debian installer?

I have created a RAID 1, with two disks using the debian installer. The RAID is used in my server. Due to the fact that it's a private server and I don't care about performance but more about ...
3
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1answer
79 views

Can I get SSD rw performance while keeing data security if I combine SSD & HDD in btrfs RAID1

I have 2 storage devices; classical slow HDD (750GB, /dev/sda) and faster SSD (128GB, /dev/sdb). Currently I have installed Ubuntu & Mint on same btrfs partition on SSD (/dev/sdb5). My btrfs pool ...
2
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1answer
26 views

Is there a way to rebuild only part of a disk in an mdraid5 setup?

Last night I accidentally used dd to overwrite the first ~20GB of a drive in a RAID5 array. When I noticed, I repaired the array with $ mdadm --fail /dev/md127 /dev/sdb $ mdadm --remove /dev/md127 ...
2
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1answer
70 views

Disappearance of files in all ext4 filesystems of a Debian server

Apparently the disappearance of files and directories occurred in all ext4 filesystems, including files and directories usually "read-only" in /var and /usr, like binaries installed for gcc, and ...
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3answers
48 views

What types of RAID does Linux support? [closed]

What types of RAID does Linux support?
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0answers
36 views

Upgrading from SSH1 to SSH2 on Linux RAID Array command line

Any ideas of how I could upgrade from SSH-1 to SSH-2 on RAID array on the command line. Raid Model: HP StorageWorks MSA2312i. Below shows that the raid node 10.5.5.75 has SSH-1.99. I need to ...
2
votes
1answer
47 views

Cannot boot into LUbuntu after configuring RAID

I am having some problems trying to get LUbuntu working with RAID 0. (I am using LUbuntu Alternate 64bit). My Setup: /dev/sda 2.0TB Physical Disk; /dev/sdb 2.0TB Physical Disk; /dev/sdc 2.0TB ...
2
votes
1answer
272 views

Btrfs/ZFS Network Replication

Is it possible to replicate a ZFS or Btrfs raid volume in real-time (or as close to as possible, network specs aside) over a network? ZFF and Btrfs are ideal because of their CoW properties. I'm ...
2
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1answer
140 views

How do I clone a single drive onto a new RAID 1 array?

Here's a little background on the situation at hand. I have a DELL Precision T7600 at work that I'm responsible for maintaining, which just lost a hard-drive, thankfully just the /home directory was ...
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1answer
73 views

How do I handle Linux RAID0 and Windows striped dynamic volumes on the same set of hard disks?

I recently got a 1TB disk to supplement my two 500GB disks, and I decided to use some form of RAID on the latter. I divided the 500GB disks into two partitions each. Then, I created a RAID0 using the ...
3
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1answer
59 views

Soft raid1 schedule resync

Debian has a cronjob /etc/cron.d/mdadm that starts a raid check (& resync?). It costs a lot of IO and can take up to 96 hours on 3TB disks. At this time the performance of the service will go ...
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1answer
27 views

What happens if my RAID fails while the swap is on it?

Today I removed swap from the system drive on my Debian. And created a swapfile on md0. So, I have a RAID1 array for data and a swapfile (the only swapfile). The system with boot partition is on ...
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2answers
44 views

I'd like to verify mdadm RAID1 is completely fine

Is there some mdadm --verify similar command, which would read all sectors of both disks in RAID1 to truly verify it's fine?
1
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1answer
90 views

Restore disk image from non raid installation to RAID1

I had a disk Running Ubuntu 14.04 LTS Desktop that crashed. I have a disk image of the drive and i want to put it onto a raid 1. That's it, i thought it would almost as easy as it sounds but ...
4
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1answer
108 views

Why does mdadm believe my raid1 “has failed so using --add cannot work”?

TLDR: Trying to add a blank partition to a degraded RAID1 with mdadm 3.3.2 (Debian Jessie) fails, saying the (perfectly working!) array has "failed" and "--add cannot work". Is it telling me of a real ...