Questions which refer to software RAID implementations.

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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 ...
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2answers
93 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: ...
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2answers
889 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 ...
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2answers
315 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 ...
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1answer
1k views

Does windows 7 disk manager mirror disk or partitions?

My servers Raid 1 disappeared when I did a bios update, And now in order to get it back I have to format my 2 * 3tb hard drives. Which isnt really a solution for me. So I have desiced to try and make ...
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3answers
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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 ...
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1answer
6k views

XFS Can't Read the Superblock

I awoke this morning to find an email from my RAID host (Linux software RAID) telling me that a drive had failed. It's consumer hardware, it's not a big deal. I have cold spares. However, when I ...
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1answer
168 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 ...
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1answer
92 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 ...
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2answers
526 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 ...
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1answer
369 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 ...
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2answers
734 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 ...
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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 ...
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1answer
6k 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 ...
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2answers
152 views

Removing a disk from an Ubuntu mdadm RAID marks the array as inactive, instead of degraded

I'm setting up a mdadm raid 1 array on Ubuntu 14.10 under VirtualBox. Everything works fine: The raid 1 is set up with /dev/sdc1 and /dev/sdd1: Personalities : [linear] [multipath] [raid0] [raid1] ...
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1answer
269 views

Boot partition for Software RAID 1

According to this tutorial: http://edoceo.com/howto/mdadm-raid1 as well as the answer to this question, ...it is necessary to create a separate boot partition if you want to boot from a software ...
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1answer
1k 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 ...
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2answers
300 views

RAID on partitions or devices

I plan to create a software-only Linux MD RAID10 array from two identical 1TB discs (using mdadm). Should I create it directly on the two disc devices (/dev/sda and /dev/sdb) or create a partition in ...
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1answer
2k 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 ...
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1answer
51 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 ...
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1answer
65 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 ...
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1answer
2k 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. ...
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4answers
4k 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 ...
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1answer
937 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 ...
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1answer
3k 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 ...
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2answers
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How to install software RAID using Mint Live CD

I wish to install Linux Mint 11 with RAID 1 for my /home. I was wondering if I can install RAID 1 during the installation from the Live CD. I have managed to set up RAID from the Live CD and install ...
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1answer
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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 ...
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1answer
211 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?
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1answer
913 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 ...
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1answer
831 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. ...
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1answer
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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 ...
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1answer
651 views

Windows7 Create Striped volume

I'm trying to raid0 a data partition on two disks in Windows7 Pro 64bit. Both drives are identical, partition scheme is identical, I have converted them to dynamic disks. But all the raid options in ...
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1answer
389 views

How do I setup a software raid 1 on 2 newly installed HD's in ubuntu

I setup a HTPC about a month ago, and just expanded my storage by adding two 750GB drives in addition to my OS drive. I am using Ubuntu 9.10 as my OS and need help setting up a raid 1 on the two ...
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1answer
792 views

Can you explain these PassMark Disk Scores on my RAID1 vs RAID10 volumes?

I need some help in interpretting the following speed tests on two Volumes on my home PC. The test: CrystalDiskMark 2.2 Windows 7 Disk Cache was disabled Both volumes were 0% fragmented before the ...
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RAID5 active device failed during reconstruction

I have this Linux RAID5 array with 4 2TB harddisks, with 3 active device and one spare, giving me a total disk size of around 6TB. Recently one drive (sdd) is starting to give me some SMART errors, ...
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1answer
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MDADM RAID5 recovery, refused to add replacement disk

I dealing with a faulty raid5 setup (3x2TB disks): Number Start End Size File system Name Flags 1 1049kB 1026MB 1024MB ext3 primary 2 1026MB 6146MB ...
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Growing an encrypted RAID5 array without causing alignment issues

Question Is there anyway to tell mdadm to make sure a certain logical sector on the RAID-device stays aligned to the beginning of a stripe when growing a RAID5 array? Problem My RAID5 is encrypted ...
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2answers
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MDADM says can't assemble RAID5 because missing disks but all disks are there

To start this, I installed a SATA expansion card so I could get more Drives into the computer. I moved the RAID to the expansion card, after attempts failed to get the OS SSD onto them. There was a ...
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1answer
89 views

move mdadm raid to new system

Have a 4-drive Ubuntu mdadm raid in a system whose motherboard (ASUS N1996) failed permanently. I tried putting the 4 drives in another system with a different motherboard, but when it came up it ...
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1answer
122 views

Recover LVM with software raid

I have a Synology NAS using SHR mode, which is basically LVM and Raid 5. Somehow my LVM volume became corrupted and won't mount anymore. This volume houses over 20TB of data, and most of it is NOT ...
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142 views

Linux MD software raid stripe cache size

From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory. By increasing this value you can get a ...
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windows server 2012 span multiple raid 5 arrays

I have some old hard disks that I want to get as much out of them as possible for space. Currently, I have: 2 x 200 GB HDD 2 x 500 GB HDD 2 x 1.0 TB HDD 1 x 1.5 TB HDD If I combine them as ...
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187 views

Raid 5 Degraded

I have a dell PowerEdge T110 with a raid 5 array that says it is degraded. This uses a perc s100 controller. I am using 4 74gb raptor drives for the array. The computer tries to boot but it hangs on ...
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Windows Software RAID recovery after non-RAID drive failure

This is a hypothetical question but first some context. I'm looking at setting up a simple RAID 1 (mirrored) for storing data. I was looking at using Windows Disk Management tools on a Windows 7 ...
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MDADM RAID 5 disk missing after reboot

I have a server with 6 disks (4x2TB + 2x4TB). I put the 2TB disks in 2 RAID 0 and the resulting 2 4TB RAIDs with the 2 4TB disks in a RAID 5 array. The RAID works fine until I reboot the server. After ...
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1answer
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Move two X-RAIDed disks to ubuntu

I have an old NAS (Netgear ReadyNAS Duo) that are X-RAID (Expandable RAID) that I need to move on to a new Ubuntu 12.04 Server. Assuming that this is software raided, does anyone know where I can ...
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Is there a safe way to move a partition beneath a linux software RAID5 using mdadm?

Suppose, for example, that you have a RAID5 across multiple disks and you would like to retire the oldest of the disks and replace it with something from this decade. I know I can fail the partition ...
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SDcard /dev/sdb2 is apparently in use by the system; will not make a filesystem here

I divided my sdcard into 2 partitions, but It got an error and couldn't create a new partition. Error: /dev/sdb2 is apparently in use by the system; will not make a filesystem here! My ...
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1answer
203 views

Trying to Narrow Down a Disk Error

I've been experiencing some weird errors from some hard drives, and I'm having trouble narrowing down the problem. It's part of a RAID array (Linux software RAID, budget hardware), so when it dropped ...
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1answer
371 views

RAID 5 degraded performance

I'm currently rebuilding my fileserver, but because of SATA port limitations, I can only use 5 disks at a time. I've remove a drive from my original RAID, so I've been able to create a new degraded ...