The tag has no usage guidance.

learn more… | top users | synonyms

2
votes
1answer
19 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
0answers
20 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
25 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
19 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
27 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
41 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
24 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
31 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
50 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
57 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
55 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 ...
2
votes
1answer
74 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
56 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
42 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 ...
1
vote
0answers
14 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
42 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
60 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
93 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 ...
1
vote
1answer
62 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
0answers
66 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
56 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
81 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
51 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 ...
1
vote
1answer
997 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 ...
3
votes
2answers
683 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
279 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
43 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
257 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
295 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 ...
2
votes
1answer
65 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 ...
7
votes
3answers
1k 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, ...
0
votes
1answer
1k 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
votes
0answers
55 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
votes
1answer
378 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 ...
1
vote
1answer
327 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 ...
1
vote
2answers
443 views

What is the correct way to set up sw RAID1 so either drive boots?

I've set up a non-UEFI CentOS 6.6 "blank" install with /boot and / each in a separate RAID 1 (3 drives/1 spare). I removed one drive, rebooted, and let it sync to the spare. When I saw this was ...
2
votes
1answer
70 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
2answers
849 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 ...
0
votes
1answer
249 views

Hot swapping a mirrored disk on a HP UX

I'm trying to do a hot swap on a mirrored lvm. $ vgdisplay -v /dev/vg00 --- Physical volumes --- PV Name /dev/dsk/c2t0d0s2 PV Status unavailable Total PE ...
0
votes
0answers
66 views

How to recover a partition recreated with gparted

Yesterday I've had the bad idea to try to follow this tutorial : http://fds-team.de/cms/articles/2013-12/use-a-real-windows-7-partition-in-virtualbox-kvm-vmware-player-u.html these are the commands ...
3
votes
1answer
318 views

Unable to check a mdadm RAID1 array, says the file system's read only?

I recently migrated a RAID1 from a CentOS 5 system to a CentOS 6 system and ever since when I attempt to perform a check I get the following: $ echo 'check' > /sys/block/md127/md/sync_action ...
3
votes
1answer
301 views

RAID 5 built using mdadm starts in degraded mode. Is this normal?

I am setting up a new set of drives on a CentOS 7 installation (10x1TB), however am seeing something annoying during the build process. When I attempt to build the array, it is immediately recognised ...
1
vote
1answer
257 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 ...
2
votes
2answers
118 views

Recovering mismatched sectors in a RAID array

I recently got an automated email saying "WARNING: mismatch_cnt is not 0 on /dev/md3". I'm running a software RAID5 array using mdadm on CentOS 6.6 When Googling the message I found this:- The ...
1
vote
2answers
828 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 ...
3
votes
2answers
111 views

Raid 5 not starting

I had a raid 5 with 3 disks in my old computer, but the motherboard died. I put all the disks in a New computer, but the raid doesn't want the start anymore. When booting the pc, i can see all ...
1
vote
3answers
149 views

Software RAID10 setup writes small files extremely slowly, is this normal?

I have a software RAID-10 setup on Linux 3.16.6-203.fc20.x86_64, with 1.2 metadata and the default chunk size (512K): $ cat /proc/mdstat md0 : active raid10 sdc1[4] sdb1[0] sdd1[2] sde1[3] ...
1
vote
2answers
408 views

Missing mdadm raid5 array reassembles as raid0 after powerout

I had RAID5 array of three disks with no spares. There was a power out, and on reboot, the array failed to come back up. In fact, it the /dev/md127 device disappeared entirely, and was replaced by an ...
2
votes
1answer
715 views

A SparesMissing event had been detected on md device /dev/md0

I'm getting the following mail every day on a server: This is an automatically generated mail message from mdadm running on <host> A SparesMissing event had been detected on md device ...
0
votes
3answers
2k views

How to combine multiple HDDs into one big HDD in Linux?

I'm very new to Linux, being mainly a Windows 7 user, so I may not understand Linux-specific commands without explanation. I've decided to build a NAS running some form of Linux (probably FreeBSD or ...