RAID stands for Redundant Array of Independent Disks, and is a technology which can provide increased reliability, performance, and/or redundancy by utilizing multiple hard drives simultaneously. RAID can be implemented in a computer via either a hardware or software controller.

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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 ...
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4 views

mdadm one disk sometimes is missing after reboot

On a debian system my home directory is on a raid1 md array. After creation it worked fine for some time, but once the second drive disappeared from the array. # cat /proc/mdstat Personalities : ...
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How do I deal with BTRFS raid1 when usb disk device mappings changes?

I created a btrfs raid1 one by using "mkfs.btrfs /dev/sdc1 /dev/sdg1". It worked fine but next time I restarted my pc it seemed like the sdg device became sdf therefor btrfs refused to mount this ...
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poor write performance with RAID 5 array

I have an Intel RS2WC080 RAID controller card connected to an array of 8 WD Black 4TB SATA3 drives, in a RAID5 configuration. While the read speed is ~750MB/s the write speed hovers around 45MB/s. I ...
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7 views

Intel Rapid Storage: Error Occured(0,1)

A friend of mine is experiencing this problem. Every time the machine starts this error Error Occurred(0,1) is shown as at the next picture: Then in Windows the RST utility shows this error ...
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How to figure out boot disk from bcdedit?

I have Windows Server 2008 R2 software mirror. I boot from volume c:. When i use: bcdedit I can see 3 different "Windows Boot Loader" entries with "device partition=C:". How can I figure out ...
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25 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 ...
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1answer
32 views

Difficulty removing corrupt directory

I have two disks in raid 0. I ran fsck on them and long story short, didn't fix it completely. I found it is all in a single directory. I dont mind losing this dir completely so i tried to rm it. I ...
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33 views

Debian shutdown takes a long time (RAID/crypt related)

I'm running Debian Jessie and recently my shutdown has been taking a long time. When I sudo shutdown -h now I'm sent to a blank screen except for a blinking cursor which sits for ~1 minute. It then ...
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14 views

Moving software RAID to Linux

I'm using a RAID 1 (mirrored pair) configuration in my Media Center/ NAS system. Currently it's running Windows 8 (yeah, big mistake I know) and I'm regretting it (did it for the games, not worth it). ...
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1answer
239 views

Running ZFS as MediaStorage with non ECC-Ram

First to the Setup: I'm planning to use 8-11 USB3 Disks to form a MediaStorage The idea is to use 2 USB3 Hubs to balance the load between two seperate USB3 Ports (on different hubs) Now from what ...
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8 views

Add Mirror for volumes other than the last one in Windows 7 (disk “not up-to-date”)

I'm using Windows 7 x64 Ultimate. I have an existing 4TB disk with 3 NTFS volumes, a new 3TB blank disk, and I'm trying to mirror the volumes onto the new disk. My Windows install is on an SSD which ...
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2answers
487 views

Merge Two Folders To Act As One (Software Raid 0?)

Using Windows 7, I'm trying to setup what I've come to call a "Software Raid of Folders", not completely sure it's the right term, but I'm sure anyone who knows the true term will understand what I'm ...
0
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1answer
23 views

What is the best way to create RAID 1?

I'm looking for a way to create the RAID 1 array without losing my data on CentOS. Here's my situation: I've got a web server running on CentOS. There is one VG partition with few LV volumes. I bought ...
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817 views

Very slow volume expand on Synology ds2413+

I've posted this elsewhere on the internet aswell, and will obviously reply in both places if a proper solution is found. I am attempting to expand SHR volumne (2x4TB, 1x2TB) with additional 4TB ...
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5answers
2k views

Unable to enter RAID BIOS on X79 chipset

I have got Gigabyte GZ-X79-UD5 motherboard. It is an Intel X79 motherboard with integrated RAID controller and additinal external RAID controller. This is the first time I want to setup RAID in my ...
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0answers
123 views

Converting ASUS Zenbook from Win8 to Win7.. do i need raid drivers?

I've got an ASUS ZEnBook Prime, ASUS Zenbook UX301LA-XH72T 13.3" Touch Ultrabook and it runs 500GB SDD on RAID 0 configuration. This notebook is running Windows 8, and i desperately need to convert ...
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12 views

Broke my RAID. hp dv4-5100 with 500GB HDD and 32GB SSD

I was having trouble installing Ubuntu, presumably cuz Ubuntu got confused with the RAID configuration of the HDD and SDD. So i found a thread that explained the issue a little, but skipped some ...
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2answers
133 views

Raid0 assemble disk again?

Our server recently suffered a disk failure, so our hosting provider put a new Disk in with CentOS so we can login and see if we can recover the data. We had 2 x 120 GB SSD drives in software RAID0 ...
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0answers
12 views

How to make ubuntu/udev start a nested raid array?

A nested RAID1+0 is not started up on boot (this array is not the root fs, which would add a layer of problems, I see). Udev/initrd assembles the lower raid0, but fails to insert it into the raid1 ...
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12 views

Windows 7 disk mirror resync

I currently have two 2TB drives mirrored with windows 7's built in software raid (located in disk management). So far there was no major problems apart from one incident when I had to hard reset ...
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12 views

Marvell 9128 sata 3 or Intel P55 sata 2, which is best for Windows software RAID 1 (mirror)

My friends has a Gigabyte GA-P55A-UD3, which come with Marvell sata chips and Intel sata chips.GA-P55A-UD3 specification I have just help him to install Windows 7 pro. I buy two new 1T HDD, I ...
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2answers
996 views

WIndows server 2012 will not allow mirroring drives/partitions

I have a dell c1100 server and it gave me a hard time installing windows server 2012. Now installed, I want to setup mirroring inside windows (raid 1 effectively). In disk management, I right click ...
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1answer
24 views

Software RAID 0 under Window 7 on 2 HDD only (including system drive) - is it possible

I have two hard drives in my notebook. I cannot add third drive. Is there a possibility to somehow set up software RAID 0 (striped) under Windows 7? My notebook does not support hardware RAID 0. I ...
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3k views

Why can't RAID 0 utilise all disk space on two different sized disks?

To quote the Wikipedia article on RAID: A RAID 0 can be created with disks of differing sizes, but the storage space added to the array by each disk is limited to the size of the smallest disk. ...
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13 views

how to use Intel RAID 1 on windows 7 boot drive

I have a motherboard with Intel RAID. and 2 new and empty 1T HDD. I want to use 2 HDD as RAID 1 (Mirror) to install Windows 7 pro (C: drive). What is the best or correct way to do it? I have ...
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3answers
38 views

is it a good way to do RAID 1 (mirror)?

I am new to doing RAID 1, I have a idea. Due to RAID 1 must use two same size HDD, if one fail, I must buy a new one which is identical or lager than the old one. So, is it better to use 95% of HDD, ...
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63 views

How does one enter RAID configuration on ultrabook devices, such as Asus Zenbook UX301-LA?

This laptop has two SSDs which come configured from the factory in a RAID-0 configuration. At the time I was running VMs and other similar workloads on this machine, so I forced the machine to expose ...
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7answers
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Simple mdadm RAID 1 not activating spare

I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin. The command sudo mdadm --detail /dev/md0 used to ...
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Single-bit error on RAID device?

For the first time since I've owned a PC (30 years) I have experienced an undetected, uncorrected single-bit disk error. In a RAID array. The sequence of events was Upload a collection of digital ...
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1answer
24 views

OCZ Vertex 4 64 GB timeouts on Areca 1880IX-16-4G

I use 3x OCZ Vertex 4 64 GB in RAID5. If they work then it's all ok, but suddenly random drives are dropped from array with timeout errors. Sometimes even two of them which causes filesystem errors. ...
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3answers
805 views

Can I use an entire drive for as a software raid member?

Can I use /dev/sda and /dev/sdb for my RADI1 configuration? Or do I first have to partition both with a single Linux raid partition?
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1answer
92 views

Dell Poweredge SC1435 Hard-Disk Failover…what is that?

I don't think this server has raid...or does it? In the bios you have an option for Hard Disk Failover...what does that do? Is that raid 1? Does anyone have any ideas on this one? There is no raid ...
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24 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 ...
0
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1answer
86 views

Changing default cache policy online on LSI Megaraid

I am having a RAID 10 with 6 Harddiscs in my server. I had set the default cache policy to write through. After setting up the OS, i came to know the I/O rates are too slow. I read in some forums that ...
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9 views

Is there a way to restore previous file tree structure?

I lost a large portion of files on an ext partition, that is in mirrored RAID. It looks like half of data is wiped out. The files are missing and space is reported as free. The contents of lost+found ...
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42 views

LSI MegaRAID X99 / Haswell-E

Does anyone know if LSI MegaRAID cards will work with the new X99 chipset? I've seen some reports of people using CPUs / Chipsets not on LSI's compatibility matrix, but that information is hard to ...
0
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1answer
59 views

Configuring RAID on Intel DX58SO CTRL+I does not enter RAID Config Utility

I have two 3TB HDD plugged into SATA 0 and SATA 1. I configured the drives for RAID in the BIOS and now when I boot I see the RAID config screen. The screen lists all my drives as it should and says ...
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1answer
1k views

PCI-E x8 Raid Controller in a x4 Electrical/x16 mechanical slot

After exhaustively searching around on the internet and here at superuser I couldn't find a definitive answer to this. I've heard how with some devices they work with less pci-e bandwidth even if they ...
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3answers
1k views

SAS 15,000rpm RAID 0 slower than external eSATA single 7200rpm drive. Why?

I've got two internal 135GB SAS drives in a RAID 0 array making a 270GB logical volume talking to my Dell Precission T5500 motherboard via a Dell supplied SAS 6iR controller. Writing Speed I SaveAs ...
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1answer
27 views

Importance of TLER in Windows 8 RAID0 application?

I am looking to buy two drives to RAID. (Edit: I understand that RAID0 doesn't fit the Redundant part of the acronym, but it is listed as a standard RAID level on Wikipedia.) I'd like to create a ...
0
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1answer
28 views

Drives Disappear when Turning off Raid

I have a Dell Workstation T7610 with a 256 gig SSD and a 2 TB HDD. When I try to disable the raid controller the drives disappear in the boot order. How can I keep the drives active without having ...
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15 views

How to read data from a Raid 1 drive

I have a Sharecenter NAS with two hard drives in it setup in a Raid 1. One of the drives has failed (making noise) and somehow so has the Sharecenter. I have a SATA-USB thing but my Win8 machine ...
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2answers
893 views

Is a home NAS reliable to keep your data on (no other backups)?

The question came up while I was thinking to move some data (e.g.) pictures, old but important other data solely to the NAS (private use, no business level). My NAS is a simple 2 disk RAID system. I ...
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3answers
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Recovering data from RAID1 drive

I have recently received one of the two 1TB drives I had on a dedicated server. The drives were mirrored and the server was running CentOS 5.6. I've installed it in an USB enclosure and tried ...
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1answer
424 views

How to enlarge RAID5 array with MegaRAID WebBIOS?

I'm a little confused with RAID5. I created a RAID5 array group from WebBIOS with 6 drives. Then created an XFS partition on this RAID5 drive. How can I enlarge the RAID5 without losing data? In ...
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2answers
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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 ...
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1answer
27 views

Is there a way to show RAID details in a similar way to MDADM?

I find mdadm --detail <device> very useful when I need to know what is going on with the device (/proc/mdadm too). Example: /dev/md0: Version : 1.2 Creation Time : Mon Mar 4 ...
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1answer
6k views

Install Linux mint with Raid

My MB supports fake raid (Intel DH67CL motherboard). But I was using the system in 'software raid' as I could not correctly set up fake raid in Debian. Now, I decide to use Linux Mint 12. During the ...
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LSI MegaRAID SAS 9240i - how to construct RAID 10 correctly?

I have LSI MegaRAID SAS 9240i RAID controller. But I can't understand how do I create RAID 10 correctly. I have 8 HDDs. I can make either 4 drive groups with 2 hdds each and then add them all to span ...