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Questions tagged [software-raid]

RAID solution handled by the operating system.

Software RAID is implemented in the OS. It uses CPU to handle the RAID setup. It is cheaper than hardware raid. It often doesn't support features which you can find with hardware raid like:

  • hot spare
  • fast rebuilding of an array
  • hot swapping
  • high write throughput

Another problem is that it uses the CPU and memory of the computer to perform all the tasks (hardware raidcards have a special cpu and memory for this task). Therefor generating more load on your system.

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LVM: How to remove the extra segment created when converting RAID1 to RAID5?

I had two 1T HDD and a 500GB RAID1 LVM LV across them. Then I added another 2T HDD, and converted the LV to RAID5 using pvcreate /dev/sdd vgextend ubuntu-vg /dev/sdd lvconvert --type raid5 --stripes 2 ubuntu-vg/ubuntu-lv But now, when I list all…
yume_chan
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Software RAID Options Combining Internal SATA & External USB?

BACKGROUND I currently use a hybrid server-workstation setup for my primary workstation. Basically, just a Fedora base running Linux KVM, on which I then containerize a couple Linux flavors & a Windows Install for use as my Workstations, along with…
user958893
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Soft-raid with Windows Server (Redundancy on OS)

We lease bare-metal servers on OVH. We use Windows Server 2022 as OS on the servers. OVH offers soft-raid for all of their servers. They do not offer hardware raid. While it's generally possible to do a raid1 mirror raid on Windows Server, when you…
Alex K.
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mdstat mismatch cnt unsynchronized blocks

Both of our servers suffer from mdstat mismatch cnt unsynchronized blocks Every start of the month we got this error and we have to repair the raid using echo 'repair' >/sys/block//md/sync_action This check is caused by…
David Pivoňka
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Boot manager shows two entries but only one partition remains after restore

I had to perform a recovery (using veeam recovery agent) on a windows 2019 server instance. Before the recovery the system was configured as software raid (mirroring) with two dynamic disks. After the recovery only one disk remained and is now a…
Abid
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recovering lost access to RAID5

I had perfectly working RAID5 and added another device. I lost power during the RAID recovery. Now I have no access to it - it does not exist - lsblk does no longer recognize it as RAID5 - just individual devices. I have build a new RAID5 and…
Jan Hus
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Partition RAID or multiple RAIDs per partitions

I'm trying to setup a RAID 1 with two HDDs. This is what I'm trying to achieve: data partition (ext4) Mac TimeMachine backup partition (HFS+) I want to have RAID over both partitions, but I still want to be able to pull one of the drives and…
moritzg
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How to partition disks in Debian 10 installer for RAID5 on UEFI machine?

Installing Debian 10. I have 3 disks I want to use as RAID5 on a UEFI machine. I have tried several configurations that either led to failure to install grub or failure to boot (stuck in grub-rescue and not able to find /boot). Did anyone managed to…
Laurent CAPRANI
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ProLiant DL320e Gen8 v2 cannot see disk on SAS ports, SATA port 5 (for dvd-drive) works fine

First post on this forum, thanks for reading. Trying to get my server up and running with a RAID0 array on the built in software RAID controller HP Dynamic Smart Array B120i v3.54. The system does see some consumer sata drives with 500gb. But it…
Pemmi
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Attempting to create an RAID array in Ubuntu server 20.10

I'm attempting to create a RAID 0 RAID array on Ubuntu server 21.10, but I keep getting the following error: mdadm: An option must be given to set the mode before a second device Here is the syntax I used: ~$ sudo mdadm –create –verbose /dev/md0…
Glenn T
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How to configure notification on degraded RAID?

I am planning a RAID1(mirror) array in a NAS using either a Hardware or Software RAID controller using Linux. Though I did not find any documentation in which way the system will notify me that the RAID is degraded. I dont want to actively check for…
Alex
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Raid 5 disk replace Centos6

I have centos 6.6 with a 4 disk raid 5. One disk is bad. I removed the bad disk by serial number (it was sdc1). When i rebooted with a new disk the sd labels changed. My new disk is now sdb. Mdadm shows my raid inactive. Before i do anything else i…
RookieBeotch
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RAID10 software raid converted as RAID0

On one of the server, The RAID10 software raid volume had became RAID0 after one the disks in the RAID10 disk group failed. Also the converted RAID0 volume has become inactive. How can we recover the RAID volume after replacing the failed…
Chandra
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How do I measure the read/write speed of a hard drive in a RAID5 array?

I have created a 3-drive Linux RAID5 (md) array out of brand new Seagate Barracuda drives. I can measure the performance of the whole array by using: ioping -s 8k -c 10 -D -W ., where the current directory is backed by a RAID device (/dev/md1). Is…
sherlock
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RAID5 array is rebuilding after a fresh install of Ubuntu 20.04 Server

I installed Ubuntu 20.04 Server on a system with three Seagate 6TB drives. I have partitioned both sda and sdb in two partitions. The first partition on each disk is of 5G. I combined those two 5G partitions into a RAID1 array to mount as /boot. The…
sherlock
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