The tag has no usage guidance.

learn more… | top users | synonyms

2
votes
0answers
31 views

CentOS 7: RAID 1 high I/O wait

I am running CentOS 7, with RAID 1 (md) on the hard drives. I have the partitions set as shown below. md0 -> root (sda1, sdb1) md2 -> swap (sda2, sdb2) md3 -> misc (sda3, sdb3) on md3, I ...
2
votes
0answers
28 views

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 ...
4
votes
0answers
124 views

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 ...
2
votes
1answer
36 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 ...
1
vote
2answers
919 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 ...
1
vote
0answers
15 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 ...
3
votes
1answer
19k 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: ...
0
votes
0answers
9 views

Why is EXT4 on LUKS on MD-RAID6 not detected by openSUSE's YaST

For maximum control over the storage configuration I've got two MD-RAID6 devices pre-configured as follows from openSUSE's Rescue system before rebooting the computer into openSUSE's installation ...
0
votes
1answer
20 views

Automate replacing failed disk in software RAID

Can mdadm automatically recognize a plugged disk as a spare, partition it and add? My config: [root@okvmh2 ~]# lsblk -a NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 ...
13
votes
3answers
7k views

How to safely replace a not-yet-failed disk in a Linux RAID5 array?

I have a software RAID5 array (Linux md) on 4 disks. I would like to replace one of the disks with a new one, without putting the array in a degraded state, and if possible, online. How would that ...
2
votes
1answer
167 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 ...
1
vote
1answer
104 views

md raid not mounted by dracut

Background I'm running Centos 7. Originally, it was running on a single disk that looked something like this: 1 200M EFI System (/boot/efi) 2 500M Microsoft basic (/boot) 3 465.1G ...
0
votes
0answers
27 views

mdadm: assembling another array using device removed from active one

In an attempt to enlarge raid1 array on a working machine, I am testing following scenario: remove one of two disks add bigger disk, resync add another bigger disk, resync, grow to raid-devices=3 ...
2
votes
0answers
162 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 ...
1
vote
1answer
32 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 ...
20
votes
2answers
13k views

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 ...
1
vote
1answer
38 views

One LVM volume across multiple mdadm arrays

I'm about to set up a new nas and basically want to know if it's a bad or a good idea to have one lvm volume on multiple mirrored mdadm arrays, kind of like raid 10. I thought this would make it ...
11
votes
2answers
12k views

Is Grub installed to all the MBR of a RAID array by default by the Debian Installer?

If I use the Debian Stable (Squeeze) Installer to install Debian, booting from a RAID1 pair of drives, does it write grub to the MBR of both drives - if not, how should I best protect against a drive ...
0
votes
1answer
54 views

raid5 array reassembles as raid0

I found simmilar problem here: Missing mdadm raid5 array reassembles as raid0 after powerout, but mine is a bit different. Here too my raid5 reassembles as raid0, but i don't see any of my devices ...
2
votes
1answer
65 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 ...
1
vote
1answer
299 views

Configuring RAID on a running Ubuntu 14.04 Server

First please bare with me as while I'm no total newbie to Linux this is my first venture into running and administering a webserver. I'm currently renting a dedicated server which I thought was ...
9
votes
4answers
51k views

How to mount/recover data on a disk that was part of a mdadm raid 1 on another machine?

Some background The disk itself was "worked on" by a friend and is said to be still intact, undamaged and still mountable/recoverable The disk was part of a software raid 1 on Ubuntu 12.04 The other ...
2
votes
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 ...
1
vote
1answer
60 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 ...
1
vote
1answer
39 views

Is it safe to reencrypt unencrypted mdadm array with LUKS?

I would like to convert my raid6 mdadm into encrypted LUKS. Right now raid6 consists of "/dev/sdX1" which are raid partitions. /dev/md0 doesn't have a partition - it is pure ext4 FS. Is it safe to ...
1
vote
0answers
94 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 ...
1
vote
2answers
1k views

Create a Software RAID 1 on a Linux server (openSUSE server)

I have a server with openSUSE 13.1 on a single HDD (500 GB WD). The server has information on it and its working properly. Can i create a software RAID1 inserting a second 500 GB WD HDD? How can this ...
0
votes
2answers
45 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?
9
votes
3answers
2k views

mdadm: can't remove components in RAID 1

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, ...
1
vote
1answer
200 views

How to implement RAID 6 over different nodes on the network

I am trying to create a RAID 6 over independent nodes which are on the network. I have to further implement LVM over this RAID 6. I read about it at ...
17
votes
5answers
12k views

Linux - Repairing bad blocks on a RAID1 array with GPT

The tl;dr: how would I go about fixing a bad block on 1 disk in a RAID1 array? But please read this whole thing for what I've tried already and possible errors in my methods. I've tried to be as ...
2
votes
0answers
44 views

mdadm - Creating RAID1 on LiveUSB does not persist when re-booting

I have three drives sda, sdb, and sdc: $ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 2.7T 0 disk ├─sda1 8:1 0 1M 0 part ├─sda2 8:2 0 500M 0 part ├─sda3 ...
1
vote
1answer
88 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
votes
1answer
61 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 ...
1
vote
1answer
97 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 ...
1
vote
1answer
91 views

mdadm RAID10 - change broken disk

Tonight my server stopped answering to ssh, ping, so I drove to the server room. Server did not respond to keyboard (even Ctrl-Alt-Del), there was no data on screen (it was black, no symbols on it), ...
2
votes
1answer
517 views

How to correctly install GRUB on a soft RAID 1?

In my setup, I have two disks that are each formatted in the following way: (GPT) 1) 1MB BIOS_BOOT 2) 300MB LINUX_RAID 3) * LINUX_RAID The boot partitions are mapped in /dev/md0, ...
1
vote
0answers
74 views

How to recover an Intel RAID 0 on a Rocks cluster distribution

We had a Rocks 5.5 distribution on our cluster and wanted to upgrade to 6.2. The "/export" partition was mounted on a Intel software RAID 0 array of 2 identical hard drives (HD) (/dev/sdb and ...
0
votes
0answers
60 views

raid10 “recovery aborted due to read error” drives being marked spare

I'm trying to recover my RAID10 array. All devices are plugged into a PCI controller that I've been using for a number of years now. I just replaced all of the drives in the system, as they all seemed ...
2
votes
0answers
21 views

EFI boot and RAID6

I am a Linux beginner and I am trying to install SLES on a server with 8 HDDs, 3 TB each, but I am testing the configuration first on a VM (virtualbox). I tried following configurations and both got ...
4
votes
1answer
60 views

Prevent debian from hindering boot if a software-raid problem exists

I have a computer that I rarely have physical access to. All my access to that computer is done using SSH. On that computer, there's a software RAID5 using MDADM. This array contains data in one ...
2
votes
1answer
78 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 ...
0
votes
1answer
92 views

How to make Drives visible to OS using MegaCLI / MegaRAID not puting them in to RAID at all?

So I have 12 [12:0-12] drives that are "Unconfigured Good" as WebBIOS would say. They are not in any virtual drive span or drive group. I want to use software ZFS RAID instead of hardware one. How to ...
2
votes
0answers
79 views

How to replace faulty device on RAID5

I wanted to replace a corrupted raid5-device on my linux system (opensuse 13.2) but missed the step of set-faulty/removing the device (/dev/sdc1). So i accidently just switch the device with a cloned ...
1
vote
0answers
60 views

How has this arrangement of RAID disks occurred and is it recoverable?

I some months ago set up two RAID arrays for a system under CentOS 7. I was somewhat confused that the device list included two entries for each array, i.e. one had /dev/md126 and /dev/md126p1. The ...
1
vote
1answer
114 views

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 ...
0
votes
0answers
61 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 ...
2
votes
1answer
2k views

grub-install : File descriptor 3 leaked on vgs invocation

I installed Debian Jessie on a LVM in a software RAID 1. To make sure MBR are written on both disks of the RAID 1, I run dpkg-reconfigure grub-pc (as suggested here) and select both disks. I get ...
4
votes
2answers
1k 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 ...
3
votes
3answers
332 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 ...