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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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How to change size of RAID0 software array by resizing partition?

I've RAID 0 built with mdadm on two disk partition on two separate disks. Is it possible to resize (enlarge) this array by resizing the underlying partition, i.e. do something like stop array->enlarge partition->start-array->mdadm -G -z max and then…
Nick
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Raid-10 mdadm - How to Manually Configure Mirrored Drive Order?

How do I configure a new mdadm software RAID-10 to use a specific order for its drive mirroring? Say I have 4 hard drives: A, B, C, and D. For my own reliability and performance reasons, I want drive A to be a mirror of drive C, and drive B to be a…
Crash Override
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Single-disk array full: how to add a spare disk without losing data?

So I rent this server from Hetzner and it was labeled as 2x512gb nvme ssd. Indeed, the server contains two 512 gb nvme ssd but (my fault) I noticed only later that they were in some sort of software RAID. I managed to remove a disk from the array…
Wyatt Gillette
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desperate attempt to head off RAID 0 failure, can i copy a disk with dd?

A colleague has been using a 10TB RAID 0 array to edit a film. He suddenly realized it's 98% full. The array has started seriously acting up, but cooperates grudgingly if you shut down all processes that might index this array and interact only with…
S. Imp
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How is RAID3/4 is implemented for more than 4 drives?

I understand that, RAID 3/4 for 4 drives is: Parity Drive = D1 XOR D2 XOR D3. But what is there 5 drives or more? For example 5 or 6. How many parity drives is needed, and how XOR algorithm is working for this case?
Dmitry Sokolov
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What is the safest RAID Type for maintain the system?

What is safest RAID Configuration to maintain the system without data loss? If you have 6 X 8TB Disk On RAID 10 it has 24TB usage spaces and 1 disk failure reserve and on RAID 6 it has 2 Disk failure reserves. What is best configuration for safety…
Van Gogh
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Raid 5 is brocken after replace a disk

My server mailed me that one of my disks failed to read a block. So I decide to replace it before it failed completely. I added a new disk and replace the failing one. sudo mdadm --manage /dev/md0 --add /dev/sdg1 sudo mdadm --manage /dev/md0…
CordlessWool
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mdadm - Attempted to move raid array to new system, superblocks gone?

I attempted to move a mdadm raid 1 array to a different system this evening. I took the 2 SSDs out of one system and put them in another, then booted that system. I opened gparted to check what the disks appeared as. They showed up as being blank…
user3728501
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Is putting Server 2019 (full os with hyper-v) and 2 2019 Guests on a single two-disk Raid 1 array reliable enough?

We're currently experiencing some significant cpu/ram performance issues with 2 VM's on our current HPE 2015 tower server (2x Xeon 8c/8t 1.7ghz) running server 2012 for HV and guests (10 guests total), so we're looking at getting a HPE DL325 1x…
Joe
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Increase space by growing mdadm RAID10 from 4 to 6 (and more)

I'm running Centos 7.8 with mdadm v4.1 I have 4 NVMe (3.2TB each) configured in a RAID 10, so 50% usable space (6.4TB): Personalities : [raid10] md0 : active raid10 nvme5n1p16 nvme4n1p15 nvme0n1p1[4] nvme3n1p1[3] nvme2n1p1[2] nvme1n1p11 6250967040…
Bastien974
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mdadm RAID 10 filesystem corruption -- recoverable?

PROBLEM: I had a degraded disk in my RAID 10 array which I created using mdadm. I first removed the disk, replaced it with a new one, but when I rebuilt, I got an error saying it couldn't detect the file system of the disk. I realized with fdisk…
user3787902
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Linux software raid slow until reboot

I am running an debian 10 machine with 3 4tb hdd drives. Each drive has a 1GB partition for a raid1 for the boot and the rest of the disk is configured as a raid 5 for lvm. After a while of running I noticed that the performance went really…
Ace of Spade
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Can we move RAID configured disks across different Servers

I have 2 SSD disks configured as RAID 1 using RAID feature in BIOS. By chance if my motherboard and processor is damaged, can I connect these 2 SSD disks to another Server. Will these SSD disks boot on another Server. If not, is there any solution…
user13727833
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Windows software raid drives deactivated

Not sure what to make of this behaviour, but here goes. I have 3 Seagate 4 T drives in a windows 2012 r2 server in a software raid 5. Recently, I logged onto the server to see that 2 disks (specifically the disks in sata slot 1 and 2) were…
Stephan
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SMART failure of a 4 disk software RAID10, mdadm, 2 drives show REMOVED state

Running Fedora 32 connected to a 4-port e-sata. One of the drives is clearly failing, with this message in the logs: smartd[1169]: Device: /dev/sdd [SAT], FAILED SMART self-check. BACK UP DATA NOW! Here's mdadm: mdadm -D /dev/md0 /dev/md0: …
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