Questions which refer to software RAID implementations.

learn more… | top users | synonyms

2
votes
1answer
2k views

Having trouble with EXT4 on LVM on software RAID 5 (corruption)

Here's the quick and dirty of my problem. I'm using Lubuntu 12.04, Xubuntu 12.04 and plain Ubuntu 12.04. Tried with generic kernels 3.2.0-25 and 3.2.0-26. This issue persists on all 3 variants which ...
2
votes
2answers
3k views

How to setup RAID 5 - Windows Home Server

I am planning to install Windows Home Server 2011 on my new mini server. I have 3 x 2TB hard drives and another hard drive for the OS. I can't find any tutorials on how set up RAID 5 on Windows Home ...
2
votes
2answers
914 views

Recover Linux software RAID5 array after server upgrade

I recently upgraded a server from Fedora 6 to Fedora 14. In addition to the main hard drive where the OS is installed, I have 3 1TB hard drives configured for RAID5 (via software). After the upgrade, ...
2
votes
1answer
216 views

Does Mac OSX software raid support partial resync?

If I have a software RAID-1 (mirror) setup in Mac OSX and I turn off the system during mirror rebuild, when I turn it back on will it start a whole new resync or just do a partial resync (like linux' ...
2
votes
1answer
1k views

Access Western Digital My Book World II RAID array on my Ubuntu Linux

My WD My Book World II (Blue Rings) NAS has overheated, I think the motherboard is dead. I extracted the disks and plugged them in my desktop PC running Ubuntu Linux. The disks seems to be alive, ...
1
vote
3answers
154 views

Software raid and filesystem

What is the relation between software RAID and a file system? Are they related? Should I use a file system when I am using software RAID or I can access raided disk for RAW read and write?
1
vote
4answers
2k views

How do I diagnose a bottleneck in an Intel Atom based Ubuntu server?

I have a small media server at home which has software RAID and a gigabit link to the rest of my network. For some reason though, I only get ~10MB/s transfers when copying to/from the server. I use ...
1
vote
2answers
9k views

Ubuntu 12.04 - Add RAID 1 Array on existing device?

I read How can I add a RAID 1 array in Ubuntu 10.04 and Installing Raid 1 on Existing Ubuntu Server. However, I only have the following 2 hard drives: dev/sdb1 where Ubuntu 12.04 is currently ...
1
vote
2answers
167 views

Is there such thing as a half duplex raid-1?

I was thinking the other day. Then again, just now: So I thought "if I thought of it, someone else must have." So this idea was, in a raid-1 mirror(ish), One drive will write, and one drive will ...
1
vote
1answer
412 views

WD Green and Software RAID

On WD's website it says Desktop drives are not recommended for use in RAID environments, please consider using WD Red hard drives for desktop RAID environments or WD datacenter hard drives ...
1
vote
1answer
3k 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.) ...
1
vote
2answers
48 views

Mounting raid5 disks without one of raid's member

I have to read data from disks, which are raid5 members. I'm wondering if there is posibility to read data from those disks somehow, but one of those disks is just broken. I was trying to mount some ...
1
vote
1answer
759 views

How to create a software RAID-1 array on Windows 7 not spanning whole disks

I have a brand new PC dual booting out of a single SSD drive (win7+debian). I added a couple of 2T hd I want to use from both Win & Linux. My target is to have two separate RAID-1 arrays on four ...
1
vote
1answer
2k views

Assembling an mdadm array with “possibly out of date” disks

I've recently moved house and have had some power problems after switching on my file server that's using a mdadm RAID5 set up. The file system I'm using is ext4. It seems that at some point two (of ...
1
vote
2answers
3k views

Debian installation and RAID5

I just bought a HP Microserver for use it as dns, http, vpn, file storage and also for backups of other computers at home. I already have 2 1Tb HDD's, so I thought to buy another 2 HDD's and install ...
1
vote
1answer
8k 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 ...
1
vote
2answers
2k views

chkdsk on a mirrored drive

I am running Windows 7 and have two 1TB hard drives mirrored using Win7 disk management. (They are not the system disk.) I am getting NTSF Error events that say "The file system structure on the ...
1
vote
2answers
94 views

improving an old pc - using two HDDs

I have an old Athlon machine with 1.5GB ram and two HDDs and will install Windows 7 on it (for my mom to browse and mail). Can I get some extra performance out from the two disks? I see two scenarios: ...
1
vote
2answers
1k views

Does chunk size affect the read performance of a Linux md software RAID1 array?

This came up in relation to this question on determining chunk size of an existing RAID array. The general consensus seems to be that chunk size does not apply to RAID1 as it is not striped. On the ...
1
vote
2answers
323 views

Reliable Linux RAID Card

Can anyone recommend an appropriate RAID card for use under Linux (Ubuntu)? I have three Western Digital SATA drives, and would like to setup either RAID-1 or RAID-5. Software RAID has been very ...
1
vote
2answers
2k views

Create a mirrored array using an existing drive

Using OS X, I have a 1 TB hd. I have an empty 1 TB that I want to use to create a mirrored array. All the instructions I can find about creating the mirrored array require copying the existing hard ...
1
vote
1answer
59 views

Which RAID is easier to do recovery from, a software RAID or a hardware RAID?

I'm shopping for a new server and have been using software RAIDs. But I wondered about doing recovery on a hardware RAID vs a software one. I know with a software RAID you have to enter a series of ...
1
vote
1answer
4k views

Laptop offers RAID option - how does that work?

I am in the market for a new laptop. I'm looking at the Dell M6800 and HP ZBook 17. Both of these laptops can be configured with a RAID 0/1/5 option. Is this hardware RAID or software RAID? I have ...
1
vote
3answers
1k views

How to recover data from software RAID 5 disk partition

I have CentOS 5.8 on my computer, with 5x 1TB hard drives. I used software RAID. (RAID 1 as a boot partition md0, RAID 0 as a root partition md1 and RAID 5 as /home partition md3). Unfortunately one ...
1
vote
1answer
8k 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 ...
1
vote
1answer
1k views

Why do motherboard manufacturers continue to include fake RAID? [closed]

Windows 7 is becoming ubiquitous and offers a simple software RAID solution within the OS. Modern desktop Linux distros have good software RAID capability as well. But mid to high end motherboards ...
1
vote
1answer
182 views

OK to use Windows while a RAID array is building?

I've just put together a nice clean, fresh install of Windows 7 x64, and my two primary harddisks are building a software RAID1 array in the background while I type this. But I want to move over ...
1
vote
1answer
95 views

Help with my RAID config

I've got a 250GB SATA2 hard drive. Yesterday I boughy myself a pair of 1TB HDDs which I intend to put into a RAID-1. If I enable the RAID functionality in the BIOS, I can setup the two drives in a ...
1
vote
2answers
555 views

Commercial NAS RAID1 disks moved to Software Raid system?

I've got a couple of commercial NAS boxes and I'm wondering if they (ReadyNas duo, DLink DNS-323) or any other NAS is suitable for having their RAIDed disks moved to a software-based NAS. To be ...
1
vote
1answer
1k views

How can I downgrade a linux raid0 setup to use a simple partition

I set up my desktop machine to use software raid 0 in ubuntu when I first set it up. Because it turns out that recovery from upgrading ubuntu (which always breaks things) is harder with /dev/md0 than /...
1
vote
1answer
433 views

Paritions “appear” in my raid 1 array after reboot, and the partitions in the array have changed names

I am moving my Ubuntu install to lvm over raid 1. I created the arrays with only 1 disk initially, planning to add the second disk later. I got the files moved and the system booted up succesfully on ...
1
vote
2answers
761 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 ...
1
vote
2answers
3k views

Why does ICH10R raid 5 not show up on Ubuntu?

Using Asus P5Q Pro raid5, (ICH10R chipset). I've setup 4 SATA drives in Raid 5 using the motherboard's interface. It shows up in windows fine, without adding software. I've been using them fine for a ...
1
vote
1answer
7k views

Create JBOD or RAID 0 on a Windows Drive

Is it possible to create a JBOD or RAID 0 using an empty drive, and a drive that contains windows? I don't have a very computer literate family, and teaching them to put their stuff on the D: rather ...
1
vote
1answer
24 views

Is mixing software RAID disks across SATA and eSATA going to have any issues?

I have two eSATA drives running successfully in a software RAID on CentOS. I would like to make this a three disk mirror RAID by adding the third drive from the internal SATA drive. Are there any ...
1
vote
1answer
272 views

mdadm, Device or resource busy when adding sda

Trying to create a raid1 on a live system following this article: http://guylabs.ch/2013/09/17/create-a-software-raid1-with-mdadm-on-an-active-ubuntu-13-04-hard-drive/comment-page-1/ uname =a 3.13.0-...
1
vote
1answer
85 views

Assemble 3 drive software RAID5 with one disk missing

Is it possible to assemple a three drive software RAID5 with only two disks? I have one failed disk in my setup which i could not read at all but the two other disks are fine. So i created a dump of ...
1
vote
2answers
3k views

Use software RAID 1 drive as main disk and boot drive in windows 7?

Can I boot from a software RAID 1 (mirroring) drive in windows 7? Windows 7 would not let me install to a software RAID volume so I installed to the first disk and then added the second disk ...
1
vote
1answer
95 views

Create Degraded RAID 1 in Windows 7

Question is simple. Can one create a degraded RAID 1 in Windows 7? In other words specific to a hypothetical situation, can I have a backup drive with backup data on it, then buy a second backup ...
1
vote
1answer
61 views

Is a btrfs RAID1 mountable if the added device isn't available/offline/failed/degraded?

Assume I created a RAID1 with btrfs's functions (btrfs device and btrfs balance subcommands instead of mdadm) like so: btrfs device add /dev/sdxZ /dev/sdxY btrfs balance start -dconvert=raid1 -...
1
vote
1answer
2k views

Understanding /proc/mdstat [U_] VS [_U]

My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 (...
1
vote
1answer
4k 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 ...
1
vote
1answer
53 views

Can I go from noraid to raid1 to an existing Windows installation?

I am planning to switch from Ubuntu to Windows 7 for my HTPC and later add an extra 3TB disk. Can I install Windows 7 on a 3TB disk and later add a disk and upgrade it to 2x3TB software raid1 without ...
1
vote
1answer
71 views

Linux software RAID: Does it work if device nodes change?

If, for some reason, hard disks change device identifiers (e.g. /dev/sda becomes /dev/sdb and vice versa) does this affect a Linux software RAID system? I.e. would the device still work (assuming boot ...
1
vote
1answer
4k views

Windows 7 Dynamic Mirror Fails Redundancy

I have two 1TB HDDs forming a single volume in Windows 7 with a "Mirror" layout and a "Dynamic" type. The status is "Failed Redundancy" according to the Disk Management tool in the control panel. ...
1
vote
1answer
4k views

Performance of RAID 5 with mdadm

I have set up a software-raid 5 with mdadm on a 1.3 GHz AMD Neo 36L dual core machine using 3 1.5 TB Seagate Barracude Green drives (4k sectors). The chunk size of the raid is 512 KB. On top of the ...
1
vote
1answer
2k views

Should I include my OS partition on my RAID or separate hard drive?

I plan to build a Linux (Ubuntu 10.04) home file server soon with 3-5 x 2TB hard drives in RAID 5 software raid but I'm not experienced with setting up RAIDs. Should I include the actual Linux host ...
1
vote
1answer
231 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?
1
vote
1answer
1k views

How do I activate software raid-1 in Windows?

I use Windows Vista Ultimate, and have four disks of 500GB. Windows is already installed on one disk, the systemdisk. Now I would like to mirror the system disk using Windows built-in software raid. ...
1
vote
1answer
2k views

how to boot a linux software raid from member disk

i want to boot a working raid-1 linux system from just one of the member disks. i imagine, this could be done with a grub boot parameter, but i'm not sure. reason is, that the vmware P2V converter ...