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0
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1answer
11 views

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 ...
0
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0answers
22 views

Building trust in linux RAID mirroring [closed]

I have been trying to form a solid understanding of how RAID works in linux but unfortunately the information is too scattered in bits and pieces to be able to succeed. I am mostly interested in RAID ...
4
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0answers
44 views

RAID-1 / LVM server won't boot after power outage

Strange issue. After an extended power outage (transformer exploded!) which outlasted the UPS, a server running Slackware 13 crashed. This machine has been quietly serving accounting software and ...
1
vote
1answer
29 views

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 ...
2
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0answers
54 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
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0answers
36 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 volume,...
4
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0answers
202 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
65 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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0answers
16 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 ...
0
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0answers
13 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
23 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 ...
2
votes
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 ...
0
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0answers
44 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 "...
1
vote
1answer
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 ...
1
vote
1answer
203 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 ...
2
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0answers
257 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
47 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 ...
2
votes
1answer
86 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 ...
0
votes
1answer
70 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 ...
1
vote
1answer
90 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
49 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
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0answers
127 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 ...
0
votes
2answers
46 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?
2
votes
1answer
27 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
votes
0answers
56 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 8:...
1
vote
1answer
129 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
63 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
113 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 ...
3
votes
1answer
1k 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
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0answers
96 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 /dev/sdc)...
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0answers
64 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
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0answers
22 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
64 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 ...
0
votes
1answer
110 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 ...
1
vote
1answer
259 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 http://www.mylinuxplace.com/building-raid-over-...
1
vote
1answer
103 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), ...
3
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0answers
85 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
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0answers
62 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
136 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 ...
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
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2answers
2k 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
352 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 ...
0
votes
1answer
53 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 ...
2
votes
1answer
437 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 ...
2
votes
1answer
461 views

Centos 7: /dev/md/root instead of /dev/md0

I have in mdadm.conf the following: ARRAY /dev/md/root level=raid1 num-devices=2 UUID=331de03d:8ba39777:3b664baf:36366f33 But here is mdadm.conf example with the following: ARRAY /dev/md0 UUID=...
2
votes
1answer
95 views

How to set up robust RAID 6?

Perhaps I'm going about this all the wrong way, but I am having chronic trouble managing a RAID6 software array in CENTOS7. The system has an internal pair of drives (2x500GB) in RAID1 which has been ...
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
2k 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 ...
0
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0answers
64 views

Software raid problem

We have a software raid on our server and we have a problem with disk performances. From time to time disk i/o freezes. During those periods iostat shows that one disk is faster than another. Both ...
3
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1answer
614 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 ...