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Questions tagged [software-raid]

Questions which refer to software RAID implementations.

There are a number of RAID levels which provide improvement of performance and/or hardware redundancy. See tag for examples of RAID configurations.

This tag refers to implementations where the RAID is built in software (BIOS, OS Kernel, or user-space) rather than on the hardware (such as a dedicated RAID controller).

515 questions
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10 answers

How to get an inactive RAID device working again?

After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount /opt mount: wrong fs type, bad option, bad superblock…
Jonik
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34
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4 answers

How do I reactivate my MDADM RAID5 array?

I've just moved house which involved dismantling my server and re-connecting it. Since doing so, one of my MDADM RAID5 arrays is appearing as inactive: root@mserver:/tmp# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [linear] [multipath]…
Jon Cage
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31
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2 answers

combining SSD and hard disk in software RAID1?

Does it make sense to build a Linux software RAID-1 (mirroring) using an SSD and a normal hard disk? I want to combine the advantages of SSD (fast transfer rates, fast access times) with the advantages of hard disks (cheap, different fault model)…
oliver
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29
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3 answers

Intel Matrix Storage Manager vs Linux Software RAID

The chipset I'm using supports the Intel RSTe technology. It means that I have two options for RAID setup: Ordinary linux software RAID, using mdadm command. RSTe (either by the BIOS or, again, using mdadm command with -e imsm switch). Given that…
Leonid99
  • 393
28
votes
4 answers

How-to change the name of an MD device (mdadm)

Here is the output from mdadm -Esv: ARRAY /dev/md127 level=raid0 num-devices=2 UUID=d89d9d45:9a420812:c44c77eb:7ee19756 devices=/dev/sdb8,/dev/sda8 This is a v0.90 array. The question is as follows: how does mdadm assign the name for an…
XXL
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25
votes
7 answers

Onboard RAID vs Software RAID

My motherboard, an Asus M4a79t Deluxe, advertises RAID 0/1/5 capabilities. My limited understanding is that onboard RAID is better than software RAID. Is this necessarily true? Is an onboard RAID controller closer in performance to a software…
Mantas Vidutis
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22
votes
3 answers

Does software RAID 1 in Windows 7 improve read speeds?

Does software RAID 1 (mirroring) in Windows 7 improve read speeds? I'd like to set up RAID 1 to help protect my important documents (yes, yes, I know it's not a backup), but performance is also important to me. As I understand it, RAID 1 should…
Rich
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16
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2 answers

Can I setup a software RAID in Windows 7 using Virtual Hard Disks?

Well, the title of my question pretty much sums it up, but let me elaborate. The main idea of what I want to do is as follows: 1) I have two separate hard disks, with nearly equal performance. I use them as "basic" discs (contrast to "windows…
nightingale
  • 351
15
votes
2 answers

Expand a Linux MD RAID 10 array to use larger disks

From what I understand this is possible, but I can't find a straight answer anywhere about how exactly to go about it, and I don't want to risk losing data experimenting with it myself so I'm asking here. I have a home server with five disks running…
Kefka
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14
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1 answer

Reducing Linux Software RAID Rebuild Speed?

This may sound silly, but is there a way to intentionally reduce the speed of a rebuild in a Linux Software RAID? (Basically reducing the throughput of all of the disks so that it's not maxing out.) The RAID itself is just a bunch of drives…
David
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13
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10 answers

What's the difference between RAID 1 software mirroring and Fake RAID?

I've just ordered two new hard drives for my main desktop and a copy of Windows 7 Professional 64-bit. I'd like to do a clean install of Windows 7 onto the new drives (leaving my old Windows XP Professional boot partition around for a while in case…
kquinn
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11
votes
2 answers

How to convert a software RAID 1 partition to non-RAID partition?

RAID is not a backup, they say, but only now I can see that what I really need is an (external) backup. So, I would like to convert a (software) RAID-1 partition to a non-RAID partition (ext4) in my Linux system (Debian 7), but I am clueless how to…
Márcio Moreira
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11
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1 answer

Where is the software RAID information actually written?

Like title says, where is the actual information which specifies which disks are being used, what order, etc...? I noticed while installing a linux distro that it was detecting a RAID array without a RAID controller which must indicate that the info…
Oktav
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11
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3 answers

mdadm RAID Fast Setup with Empty Drives?

I am recreating some RAID5 disks as RAID6 with mdadm. There is no data on the drives that I care about. Setting up RAID takes a while to setup the shape - I accept that when there there is data that needs to be striped and parity calculated,…
Paul
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11
votes
1 answer

A ZFS or LVM or MD redundant heterogeneous storage proposal

I have the same problem most people have: how to create a reliable personal storage solution with the fact that: Hard drives fail with alarming regularity. Losing files is unacceptable. I will buy a new HDD from time to time. Inevitably, the best…
Bob McElrath
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