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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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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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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21 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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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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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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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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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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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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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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23 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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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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37 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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2answers
36 views

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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21 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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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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41 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 ...
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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 ...
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1answer
25 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
882 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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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 ~30 seconds. It ...
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48 views

How to monitor BTRFS filesystem raid for errors?

I saw some documentation on a daemon that can execute a program/script for various BTRFS events, but I cannot find it anymore. How can I have a script/program be executed on a drive failure for a ...
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How do I remove a partition inside linux software raid?

I have this SSD disk as sdg which is in software raid (with sdh, it's corrupted but it doesn't matter now) I need to remove partition vg00-data (dm-2) /data What command can I use to do that? OS ...
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Is it possible to configure a Sata RAID Controller without RAID

I have a 6 port SATA RAID card (taken out of an HP ML150 G2 server). What i want to do is connect the Sata Hard Drives that i have to this card without formatting or loosing any data on the hard ...
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24 views

P8P67LE Motherboard - SATA MODE RAID; Create RAID 1

As it seems my ASUS P8P67LE motherboard has built-in RAID capability. My OS is previously installed in normal mode and in BIOS setting SATA MODE is set to AHCI (Advance host controller interface) ...
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58 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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14 views

Non-RAID Disk showing as RAID

The disk in question is attached to a single ESATA port on the back of my computer. The other ESATA port has nothing attached. In the BIOS, the controller for that port is turned on, and set to SATA ...
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23 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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Hooking up Raid0 drives to Dell XPS

I recently dug up a pare of WD Raptor 74GB hard drives that I had once upon a time in an older custom built computer they were RAID0. I now have a Dell Studio XPS 8000 desktop that I'd like to see ...
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24 views

Can I recover data from a partially RAID 1 system?

I recently bought two 1TB HDDs because I wanted to build a RAID 1 system. I didn't want to lose 1TB of space so using the Windows 7 disk management I mirrored 700GB and kept the rest as a simple ...
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RAID-0 setup, 1 broken drive, still 1 partition seems unharmed. Why?

It is not my setup and I do not know a lot about RAID, so I have trouble analysing what is going on here: What I observed: Two 1 TB HDDs are in a RAID-0 Array GParted sees 2 (1 TB) partitions ...
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110 views

Windows 8 wrongly detects my Raid1 HDD as Solid state disk

I have upgraded my machine from Windows 7 to Windows 8 and then Windows 8.1 (this is the only available upgrade path to keep my files, settings AND applications). My system is setup as follows: 2 x ...
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Finding reported drive errors in Windows RAID

This machine has been through a number of RAID configurations. Most recently, it had a single drive (Disk 1) installed without mirroring, and without error. A second drive (Disk 0) was added as a ...
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26 views

Invalid system disk message, but no data loss

I built my own computer a about 7 months ago and everything was fine until I was playing game and it blue screened. After it blue screened and I restarted my computer I got a message, "Invalid system ...
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39 views

Replaced a RAID 10 drive on my Debian server - what do I do next?

I have 4 x 3TB drives in a RAID 10 array. One failed, so is now removed. /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : active ...
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Secure copy one folder to multiple destinations in OS X

Sorry for asking what looks like a question that's been asked a few times. I'm very far from being a super user, which makes it very difficult for me to be able to expand on a relatively complex ...
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20 views

Installing CentOS 6 on Asus M3N78-EM using CentOS software raid / LVM

I have an Asus M3N78-EM motherboard with 3 WD 250GB drives connected to SATA ports 1-3. The BIOS currently is setup to see the drives as AHCI instead of raid due to the controller driver not being ...
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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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75 views

Mounting disk(s) from RAID 1 array for data recovery

I'm having some problems with a Debian 7.5 stable (Wheezy) server. It is currently running at Rescue Mode. It has a 2 x 2000 GB HDD running in a RAID 1 array. My immediate priority is to be able to ...
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Is it possible to convert a btrfs RAID5 to a RAID6 with the same disks without losing data?

How would I convert an existing RAID5 (single parity) btrfs setup to a dual parity RAID6 configuration given enough free available disk space, using the same disks, without swapping out data ? ...
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26 views

mdraid 512/4096 sector confusion

I created a new mdraid array on 3TB disks, connected via USB (because the internal SATA ports were used for the old array). $ fdisk -l /dev/sdb Note: sector size is 4096 (not 512) Disk /dev/sdb: ...
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RAID 1 scalability [closed]

Assuming I'm in a home environment and I want to keep my data secure, how would I build an expandable custom NAS? I can't afford a real SATA/SAS controller. I'm thinking of a scalable array of RAID 1 ...
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35 views

How can I install Windows through an ASUS P5Q's orange and white SATA ports?

I have an ASUS P5Q motherboard, which apparently has two SATA controllers - the standard Intel one (red ports), and a Marvell controller (orange and white ports). I need the Intel controller to be in ...
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Attach SSD next to the RAID

I have an IBMX3200M3 with a 4 HDD in RAID1 and now I trying to attach an extra SSD just to a SATA port on motherboard... After system fails to boot up from the RAID and anything and i finish up to ...
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21 views

Configuring Grub2 on a second raid 1 hard drive on Fedora

Im trying to reconfigure grub to install on both /dev/sda and /dev/sdb, but the only command I have been able to find is dpkg-reconfigure grub-pc, which isnt really helpful since I am using rpm. Is ...
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30 views

Having trouble setting up RAID 1 on Fedora

I have been working for a while to setup RAID 1 on my fedora server. I have one installed with Fedora, 1 blank but partitioned. The one with fedora is /dev/sda and the blank one is /dev/sdb. I tried ...
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19 views

mdadm on Debian 7 forgetting about a disk

I have a degraded RAID1 array running on Debian 7. I am trying to add another disk to the degraded array, but mdadm forgets the existence of the other disk at reboot. The array devices are /dev/sda1 ...
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Improve slow NAS Ethernet transfer speeds: On-The-Fly Ethernet Compression with SAMBA?

Hardware: Pogoplug E02 (ARMv5te, Marvell Kirkwood 1.2GHz, 256m RAM) Software: ArchLinux, MDADM RAID 5 array, Ext4, SAMBA server This setup delivers file transfers to my Windows clients at ~21MB/s ...
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debian boot procedure stops while starting RAID5 array

imagine the following situation: debian wheezy 7.4 on arm system created a RAID5 with 3 disks /dev/md0 created ext4 file system wrote entry to mdadm.conf via "mdadm --detail --scan >> ...
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39 views

Raid Setup, 2 Hard drives - one shows in explorer

I got a new pc delivered to me and I go to start up the PC using a raid configuration. I then go to are you happy with these settingsand I select yes. Later on, I then notice that one of the hard ...