Questions tagged [raid]

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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CentOS 7 RAID 1 and virtual machines

A CentOS 7 host OS will have three CentOS 7 virtual machines running inside it. Libvirt will be used to set up the virtual machines. Both the host OS and each of the three virtual machines will need ...
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Can I rescue any data if one of two drives in LVM failed?

I have a Scientific Linus 6.7 box that serves some applications on our network. The person who set it up is no longer around. This morning machine stopped booting. There are two HDD's and they both ...
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Make RAID over NFS?

I have a cluster with 25 machines. Each machine has a small SSD disk. Can I organize the SSD disks of multiple disks as RAID-0 over NFS? (HDFS is not an option. The application requires a direct ...
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Account for missing space as reported by ZFS list

This is a question regarding the available space as reported by zfs list that does not meet user expectations. I have looked at similar questions, but I still don't understand the zfs list output. Let ...
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Cannot mount FS to mountpoint after “storcli /c0/v4 del force”

Timeline: We have a /foo/bar_new FS on a CentOS 7. We have an old /foo/bar FS on a HW raid. We copied all the data to the /foo/bar_new FS, from the /foo/bar old FS. We umounted /foo/bar (the ...
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ubuntu - raid partition capacity unchanged after RAID1 to RAID5 to RAID6

I had a 2 disk RAID 1 partition. I added a device and converted it to RAID 5: mdadm --add /dev/md3 /dev/sdd2 mdadm --grow /dev/md3 --level=5 --raid-devices=3 Then added another device and converted ...
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372 views

How is btrfs (copy-on-write) different than RAID?

Whenever I hear copy-on-write my brain immediately starts thinking RAID. How is COW any different from RAID-x version ? Both need more than 1 HDD to be useful, both make a copy of data when data is ...
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360 views

Recover RAID5 array after partitions deleted

I have (had) a large RAID5 array (3x8TB) up and running on Ubuntu 16.04 using the guide on the following page: https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-...
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SSDs in RAID slower than single device/tips to improve performance [closed]

I have a couple of hosted servers, running Debian 7, one has a single Samsung MZ7LM120HCFD, the other has 3 Intel SSDSC2BB160G4 in RAID1. The machine with the single Samsung SSD has significantly ...
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2k views

BTRFS balance completed, but still shows data stored in “single” mode

I have three drives (8TB, 4TB, 3TB). Originally, I created a btrfs partition on the 8TB drive and copied all my data there. I added the 4TB and 3TB drives by using btrfs device add, and then then ran ...
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47 views

how to prevent boot if a drive is not detected at bootup

I've got two drives in RAID1 that serve as the root partition on my workstation. Sometimes (1 out of 10) one of the drives is not detected, and thus not included in the raid. As the drive is not ...
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Grub won't boot from GPT RAID (gave up waiting for root device)

I'm having problems with booting a Debian 8 system on which I migrated the root partition from a single hard drive to a RAID1 (mdraid). On every boot, I get the following grub error: Gave up waiting ...
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“DegradedArray event”

I have a RAID 1 on my Raspi and got mail I don't understand titled "DegradedArray event on /dev/md0:my-host-name" and "Fail event on /dev/md0:my-host-name". I got 6 messages with the former subject ...
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Since upgrade from OpenSuse 42.1 to 42.2, raid5 resync upon every reboot

The subject line says it all! Since the upgrade, the machine is practically unresponsive (KDE login takes 10+ minutes, no exaggeration, to get from the login screen to the desktop) for at least an ...
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521 views

openSuse 42.2 is unable to boot when root is on RAID1 which is broken (with one missing/new/empty disk)

Here is the case: I have two disks setup in RAID 1 as follows: /dev/md0 (/dev/sda1 + /dev/sdb1) → /boot /dev/md1 (/dev/sda2 + /dev/sdb2) → / My scenario: Start server with RAID 1 and array fully ...
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mhddfs filesystem hangs after a while with large directory

I have 2 RAID1 of 4TB each which are joined together with mhddfs. There is one directory that exists on both disks that contains hundreds of thousands of files. There is a lot of read/write happening ...
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711 views

RAID conflict in dual boot setup on HP workstation w/ 2 disks

This is on an older HP Z400 workstation with HP Bios v3.57. It was working with Windows 10 on a single SATA drive. Then I installed a second disk on SATA, and installed Ubuntu 16.04 Desktop on that ...
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Cannot mark second disk in raid1 array as active

I have two 3TB drives, with a single ext4 partition on each. I have added both drives to my raid1 array but running mdadm --detail /dev/md0 outputs: /dev/md0: Version : 1.2 Creation Time ...
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Remove drive from soft RAID

I have a dedicated server with 3 SSD drives in RAID 1. Output of cat /proc/mdstat: Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md4 : active raid1 sdc4[2]...
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How to wipe or write zeroes to hard disk using /dev/sg2

I want to wipe hard disk which is behind the raid controller. I am able to break the raid. After that, i m getting /dev/sg2 not /dev/sda like. # lsscsi -g [1:1:0:0] disk Hitachi HDxxxx jp40 --- ...
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Can I use ZFS on top of 3ware raid system?

I have a server with all the disks connected to a 3ware card. I know ZFS, does his own RAID and due to its nature, needs to see individual disks, to be able to operate properly. Unfortunately this is ...
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Why are there 2 RAIDs in my /proc/mdstat?

My web hosting provider built up a bootable software RAID across all 4 drives. I have asked for a RAID 5. However when i type 'cat /proc/mdstat' i can see two RAIDs, a RAID 1 and a RAID 5. Why are ...
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raid wont start on boot

i have a problem with a raid 1 on my raspberry pi 2. as system is use jessie-lite. If i reboot or boot the system, raid won't start. root@raspberrypi:~# cat /proc/mdstat Personalities : unused ...
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786 views

MDADM lists same device twice

I'm attempting to get a software RAID array going using [this guide][1]. I've worked my way through preparing the second disk (/dev/sdb) without any errors. After running: mkswap /dev/md5 I run: ...
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How to bring up an inactive mdadm RAID after a reboot while adding a drive to a raid-6?

I have been using webmin to manage my RAID array for several years, and I never had any reason to use the mdadm commands in the terminal. However, some days ago, I added a disk to my RAID6 array of ...
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828 views

SLES checking file systems… stuck at boot after reboot

After reboot the boot is stuck on a SLES machine. Already tried a "touch /forcefsck" from a livecd to force fsck at boot, but it didn't help, still the same. Also fsck'ed rootlv from livecd. Q: ...
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md raid5: “no valid superblock”, but mdadm --examine says everything is fine

And so, it happened: the software RAID5 on my Linux box failed somehow and now refuses to assemble. An overview of the setup: headless server running Debian Jessie 8.6 (current stable) custom built ...
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Using CloneZilla with Software RAID5

I'd like to image my software RAID5 configuration (3 drives), then move it to a new set of hard drives. Since CloneZilla doesn't support software RAID, I was hoping to do the following: Create an ...
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Image used part of RAID5 onto smaller drive

I have a 2TB RAID5 of which 700GB is used and a 1TB empty hard drive. I'd like to image the RAID onto the drive (so I can later rebuild it using a different set of drives). Looks like dd images the ...
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363 views

Recover software RAID5 data

Some days ago I found that the partition related to my RAID 5 wasn't mounted. I examined my disks and I got: mdadm --examine /dev/sd{a,b,c,d}1 mdadm: No md superblock detected on /dev/sda1. /dev/...
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Create RAID-Z2 in degraded state possible?

I am moving from one server to another and want to bring some of the disks with me. Unfortunately, I do not have enough storage to back up all of the data on the old server. Old server 4 disk RAID5 ...
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134 views

Recovering RAID: what's wrong?

I have to recover my md0 RAID software with linux. Today I've bought 4 disks,all new,all the same type and size. I have removed the old disk using: mdadm /dev/md0 --fail /dev/sdd2 mdadm /dev/md0 --...
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RAID Array gone to read-only

I've created a virtual machine running on KVM only for testing and learning purposes. During the installation RAID 1 array has been configured with 3 disks for root and 3 for boot. After some playing ...
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375 views

Replaced drive not syncing in RAID5 configuration (shows as spare)

I've a RAID5 configuration (4 drives). One drive failed, showed up as a failed device in mdadm. After rebooting, the failed device didn't even appear in mdadm. The RAID5 config only had 3 working ...
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mdadm assembling array issues

My motherboard died, so I had to replace it, including the OS. So I boot first time, do mdadm --assemble --scan, raid assembled without any issues. I share the drive, reboot. Then it stops ...
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678 views

Linux RAID array not assembling after reboot

I've got a RAID problem. I had a RAID6 array on 4 drives - /dev/sd[bcde]. Working fine. I then added a 5th member - /dev/sda. Working fine. Please note: I didn't have partitions on the ...
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768 views

Create a linear array with RAID over a non-empty disk

I have a disk of 500GB (465GB formatted) and one of 80GB (72GB formatted), and I wanted to create a linear array i.e. append the space of both disks with software-managed RAID tool mdadm. The bigger ...
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65 views

Less complicated way to do Server Data Migration?

This is perhaps too specific/personal a question for S.O. but here it is: I've inherited a server currently running a single hard drive, which through default Ubuntu 16.04 server setup, is running ...
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219 views

Removing a Drive from a RAID

I set up a RAID 1 of 2 drives using mdadm on a Linux machine. What would happen if I – while the device is busy – disconnected one of the drives and then some time later reconnected it? Assume that ...
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How can I completely remove software raid?

I have an install of CentOS 6.5 which was setup with software raid (as outlined in this official documentation). There are 3 hard drives and I have RAID1 running: NAME MAJ:MIN RM SIZE RO TYPE ...
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58 views

How can I prevent data loss (after install)

I've got a Pi2 (running Raspbian Jessie) nicely set up with a 2Tb external USB drive (sda) set up so that I am booting off of /dev/sda1 (16Gb), downloading torrents to /dev/sda2 (200Gb) and saving all ...
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370 views

Only half of my drives assemble during a RAID recovery

I have an 8 drive RAID I am trying to recover. The assemble only found 4 of the 8 drives. Why are the other drives not found? me@mjf-svr:~$ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] ...
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880 views

mdadm array assemble causes kernel hang

I have a 2 large mdadm arrays, and I combine them in a volume group. I was recently adding new drives to the second array and I suffered a power outage. Typically, I don't have major problems ...
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LSI MegaRaid Controller - Switched OS's

I originally installed the MegaRaid Controller on Windows. I switched to Kubuntu and now I'm having great difficulties getting the raid setup recognized. I don't really need the raid (Just the ...
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How to continue an “mdadm --grow” after a reboot?

One of my mates has rebooted a server during a reshape. The command I initiated several days ago was: sudo mdadm --grow /dev/md227 --level=6 --raid-devices=7 --backup-file=/root/raid5backup It's ...
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874 views

How to resize and label Raid devices

I am asked to Create a RAID 0 array using the two spare drives on (5GB) on this Machine with the following specs Size=2048MB Label=RAID_0 Mount it persistently by Label at /storage Here is what I ...
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213 views

problem with the inactive RAID 5

I have a server running ubuntu server, after a crash, I lost a Disc. Here is the output: cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] ...
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Many LUNs per Partition or one LUN with many partitions

RedHat 6.x, 3par 23 raw "disks" for informix are required Is it better to have 23 LUNs, each chunk will have its own LUN or is it better to have just one big LUN containing 23 raw partitions. Better ...
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117 views

Checking an Asus PK5 hardware RAID volume from Linux

I've got a file server still running on Ubuntu 7.10 on a ASUS PK5 Pro, with a RAID 1 volume set from BIOS with the mobo raid hw controller (SATA 1 + SATA2). When one of the 2 hard disks seems to fail,...
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How to access raid partitions after controller failure

I'm running Gentoo on a Fujitsu Primergy RX200 S7. Initially had 2 SAS drives on a PRAID eP400-i controller. Suddenly, the controller seems to have died, leaving me with no choice, but to use the ...

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