Questions tagged [software-raid]

Questions which refer to software RAID implementations.

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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 ...
oliver's user avatar
  • 500
9 votes
3 answers
3k views

Any difference between Hardware RAID and Software RAID?

I'm building a new server (Small Business Server 2008), but I can't get the built-in RAID controller (AMD SB700) to work and have basically given up on it ever working with Server 2008. Fine. But my ...
Alex Papadimoulis's user avatar
6 votes
2 answers
4k views

Use the speed of an SSD + two HDDs in RAID 1

Is it possible to gain a speed benefit of an SSD if you create a software RAID with a big SSD + two small HDDs? At the moment I have a system with only two 320GB HDDs. And I thought about inserting a ...
rubo77's user avatar
  • 4,900
3 votes
1 answer
11k views

How do I safely move a Windows 7 software RAID 1 volume to a new PC?

I have 2 identical drives in an old PC running as a mirror RAID (RAID1) using the Windows 7 software RAID. These drives are data-only drives and are not being used to boot an operating system. How do ...
MatthewD's user avatar
  • 343
35 votes
10 answers
233k views

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 /...
Jonik's user avatar
  • 5,750
25 votes
7 answers
36k views

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 ...
Mantas Vidutis's user avatar
13 votes
10 answers
60k views

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 ...
kquinn's user avatar
  • 780
5 votes
1 answer
16k views

How can I add a RAID 1 array in Ubuntu 10.04?

I have an existing Ubuntu 10.04 desktop system setup and running on a hard drive (drive A). I'd like to add two more hard drives (drives B and C, same size) to the system and mount them as a RAID 1 ...
Nick's user avatar
  • 909
2 votes
2 answers
20k views

How do I tell mdadm to start using a missing disk in my RAID5 array again?

I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine. When I had it all back ...
Jon Cage's user avatar
  • 2,577
2 votes
1 answer
4k views

How to clear RAID "Error Occurred(0)" member disk message?

I had a bad SATA cable which caused an "Error Occurred(0)" message to appear on one of the member disks. I replaced the cable and everything works fine now, but the message remains and the RAID logon ...
Dean Kuga's user avatar
  • 691
22 votes
3 answers
27k views

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 ...
Rich's user avatar
  • 364
14 votes
1 answer
21k views

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.) ...
David's user avatar
  • 858
11 votes
2 answers
17k views

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 ...
Márcio Moreira's user avatar
9 votes
3 answers
5k views

Will mirroring with an SSD improve read performance?

If you use Windows 7 to mirror a volume across an SSD drive and a mechanical hard drive, will the read performance be similar to a single SSD drive? I.e. is Windows smart enough to read from them ...
Jon-Eric's user avatar
  • 2,222
8 votes
3 answers
20k views

How do I mount a software RAID1 (mirror) created by Windows in Linux using mdadm?

I'm switching my Windows server to Ubuntu and am trying to get my software RAID1 (mirror) that I created in Windows to show up in Ubuntu. I have read that this is possible here using mdadm, but I'm ...
Grezzo's user avatar
  • 962
8 votes
1 answer
27k views

Best performance: Windows 10 software striping vs. storage spaces simple

Looking to squeeze a bit more speed out of my development PC for test VMs without necessarily switching to hardware RAID. I've got two identical 2TB SATA-3 data drives (OS is on SSD) so I could ...
munrobasher's user avatar
7 votes
4 answers
63k views

How? Mount, Find & Recover DATA in HDD outside of Synology Box

How? Mount, Find & Recover DATA in HDD outside of Synology Box I had originally posted this question here on Synology Forums and no real solution was suggested except a Linux / RAID based ...
Alex S's user avatar
  • 981
6 votes
3 answers
24k views

Creating a RAID1 partition with mdadm on Ubuntu

I'm trying to set up a RAID1 partition on my Ubuntu 9.10 workstation. On this dual-boot system, Ubuntu is running from a separate drive (/dev/sdc - an SSD that is quite small, which is why I need ...
Jonik's user avatar
  • 5,750
5 votes
2 answers
16k views

How to install Windows 7 onto software RAID-0

I recently got a new laptop (Asus G73JH-A2) which has two identical hard drives in it. Unfortunately the motherboard does not have a RAID controller. What I would like to do is run the drives in a ...
Jay B's user avatar
  • 91
5 votes
2 answers
11k views

Convert RAID 1 to RAID 10 in mdadm

In my current Ubuntu server, I have 2x 2TB Western Digital RED hard drives in a RAID 1, using mdadm. I would like to add 2 more 2TB RED drives, and convert it to a RAID 10. I realize I would have to ...
Canadian Luke's user avatar
5 votes
4 answers
15k views

New mdadm RAID vanish after reboot

I have problems with mdadm after reboot, I can't reassemble /dev/md0 . I work on debian wheezy. I have done the following steps:: sudo mdadm --create --verbose /dev/md0 --level=6 --raid-devices=4 /...
peon's user avatar
  • 51
3 votes
1 answer
686 views

I'm trying to mirror drives of the same model, but one appears to be slightly larger

I'm trying to mirror a drive using Disk Management in Windows Home Server 2011. The target drive (Disk 1) is the exact same model as the source drive (Disk 0), but the target drive appears to be 1MB ...
Louis Waweru's user avatar
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3 votes
1 answer
1k views

Is it possible to recover / convert / mount fakeraid image files? (TL;DR - have fakeraid images, want to convert them to mdadm images)

My Promise NAS NS4300N recently died (PSU or motherboard failure, probably the former as it has trouble spinning up the disks). I've managed to dd(1) the drives (4 500GB drives in a RAID5 ...
thoughtbox's user avatar
2 votes
1 answer
741 views

Software RAID and backup altogether

In this thread I've got most valuable tips regarding the home RAID solution options as well as their pros and cons: RAID for home use I've figured out for myself a few important points (the ...
Alexander Abramovich's user avatar
2 votes
1 answer
708 views

Software RAID 5 with Multiple Partitions (one encrypted partition)

Can I have multiple partitions using Software RAID 5 on an Ubuntu Server? For example, say using a 4 drive RAID 5 setup, I want one massive partition for storage and a second smaller but encrypted ...
wag2639's user avatar
  • 7,134
2 votes
1 answer
5k views

Degraded RAID5 and no md superblock on one of remaining drive

This is actually on a QNAP TS-509 NAS. The RAID is basically a Linux RAID. The NAS was configured with RAID 5 with 5 drives (/md0 with /dev/sd[abcde]3). At some point, /dev/sde failed and drive was ...
ark1214's user avatar
  • 23
2 votes
1 answer
84 views

Managing raid6 device with pacemaker

I am setting up 4 hosts, each exporting one local storage device over iscsi with target. Every other hosts imports it such that each host has concurrent access to all 4 each storage devices. I built a ...
Nykau's user avatar
  • 51
1 vote
1 answer
658 views

Reinstall linux with software RAID

I've got ubuntu server on my "home server" with 5 software raid 0 partitions and one software raid 1. I have to reinstall OS. Is it possible to do that without losing existing partitions with data?
mmatloka's user avatar
  • 111
1 vote
2 answers
896 views

Setting up an 8 drive raid for home use - hardware configuration?

I wish to build an 8x1.5tb file server for home use. I was looking at putting these 8 HDDs into RAID 5 or 6. However most botherboards only come with 6 sata ports so I will obviously need to get an ...
Michael Galos's user avatar
1 vote
1 answer
351 views

Setting up a RAID 5 Array

I am currently trying to convert my drives from just a bunch of external disks, each one individually shared from my (CentOS) server into a RAID array (ideally, RAID 5). At current, my drives are: 2....
topherg's user avatar
  • 1,120
1 vote
1 answer
4k views

mdadm: RAID gone after reboot, partitions gone, service masked

Some weeks ago I set up a software RAID 1 with mdadm, consisting of two 2TB WD Red HDDs, as a backup medium (Debian Stable). Everything works, I hooked up everything for it to come up after a reboot, ...
xalib's user avatar
  • 33
1 vote
3 answers
9k views

MDADM raid "lost" after reboot

I am kind of scared right now, so I hope you can bring light on my problem! A few weeks ago, I bought a new 2TB drive and decided to setup a software RAID 5 with MDADM on my HTPC (drive sdb, sdc and ...
Patrick Pruneau's user avatar
1 vote
1 answer
9k views

How can one setup RAID 1 in Linux Mint 13?

I am trying to setup a Linux Mint 13 system using mdadm, with 2 1TB hard drives for a software mirror. I have tried following instructions found for Linux Mint 12, but the instructions fail to mention ...
Canadian Luke's user avatar
0 votes
2 answers
19k views

Set up raid 1 after OS installation

I bought 2 Lenovo thinkstation E31 and I want to set up RAID 1 on them. I added a hard drive for each. I went in the BIOS and set it to RAID then I pressed ctrl-l to start the raid manager but it ...
Marc's user avatar
  • 223
0 votes
2 answers
2k views

How can I recover software RAID 0 after formatting my primary OS drive?

I was previously running Windows 7 on a machine that had 5 physical drives - 1 was the primary drive the OS was installed on, and the other 4 were a RAID 0 that was created through Windows 7 disk ...
Patrick's user avatar
  • 187
0 votes
1 answer
1k views

Update grub for whole disks added to software raid

I have a raid-1 running under rhel6 (/dev/md0) that is mapped to /. It contains two unpartitioned disks (/dev/sda and /dev/sdb). I'd like to be able to boot from either disk. But grub won't let me ...
clu's user avatar
  • 1
0 votes
3 answers
583 views

RAID-1 in RHEL 6; can't get partitioning on identical devices to look identical

I have a RHEL 6 fileserver. It contains two identical 2TB SATA drives. Both are supposed to contain one partition that takes up all the space on the drive (and this used to be the case). When I had ...
clu's user avatar
  • 1
0 votes
1 answer
2k views

Steps to swap failed disk in RAID 10?

I have a RAID 10 array consisting of 4 disks. One of them has failed and I have removed it from the array. I have purchased an identical new drive and am unsure about how to add the new drive to the ...
BrokenCode's user avatar
0 votes
1 answer
330 views

What would happen in a Software Raid 1 of one HDD and one SSD?

I'm running my Windows 7 installation and all of my apps from an SSD for performance reasons. Since SSD's can instantly die at any moment, I'm looking for some kind of data backup strategy. Right Now ...
Adrian Grigore's user avatar