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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BTRFS or LVM heterogeneous RAID

I'm entertaining creating a largish (3.5TB+) backup server for my family. I already own enough hardware, and I don't want to buy any more right now. The config I envision look like this: Two 1TB ...
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14 views

Drive Jumper Settings for Creating RAID 0 Disk Images

I have a RAID 0 array of four 250 GB Disks, which constituted a single (LaCie) 1 TB virtual drive. The power supply died, so I removed the physical drives from the enclosure. I will attempt to ...
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32 views

Windows software raid0 giving bad performance

I have two Samsung SSD's in RAID0 mode. I measured their sequential read/write speeds first in RAID0 Hardware and they give around 1000 mbps but then I used two disks in RAID0 software from within ...
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634 views

Why can't Windows Server 2008 R2 (during clean install) find ANY device drivers?

I am trying to get a fresh install of Windows Server 2008 R2 Standard (64-bit) onto a (somewhat dated) Dell PowerEdge 1800. I'm am using the bundled Adaptec CERC SATA1.5/6ch RAID controller, and have ...
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429 views

How many drives do I have?

This is the first time I ordered a dedicated server with 3 HDDs and I am quite confused. My limited knowledge tells me that /dev/sda /dev/sdb /dev/sdc are the 3 drives that I actually have. But, ...
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57 views

Raid Configuration lost After For Installing Windows/Formatting Hard Drive on reboot

My boss recently got a tower fujitsu server, I dont know the model because it is written in Chinese. I installed windows server 2012, activated hyper-v and even installed ubuntu as a VM and ...
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1k 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 ...
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249 views

RAID 10 “failure” after changing BIOS setting

I have been using a RAID10 setup for quite some time and today, after loading a saved BIOS configuration (for overclocking), it set my SATA mode to AHCI rather than RAID. I didn't notice this and ...
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2k views

Synology NAS station - how to mirror 2 HDD (Simple how-to)

I have a following problem with my Synology disk station: I had one small HDD in Synology Diskstation, so I removed it. I bought 2 new HDD with same capacity. I transferred backup from old disk to ...
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329 views

Btrfs raid level for large NAS (8+ 5tb disks)

I'm planning to build a new NAS to store a large amount of media (20tb+). I would like to use btrfs for both the NAS and the backup (might be a separate system, not sure yet) I want to use raid1 or ...
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100 views

I reinstalled ubuntu and now I don't see my RAID drive

I originally had a Ubuntu 12.04 system with RAID5 array that I built using mdadm. Due to issues with graphics drivers, the 12.04 system crashed and I had to reinstall the operating system. After ...
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95 views

PCI-Express RAID Controllers with TRIM Support

I've an AMD Athlon computer with Windows 7 and I'd like to set up an SSD Raid 0. Are there any PCIe RAID controllers with TRIM support available on the market? The only thing in this are that I've ...
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59 views

Multi-distro LINUX from grub2. LVM Vgs not detected

Having a very weird problem with LVM in linux earlyspace. My system runs with 4hdds. Three are sata and one is eide/pata (/dev/sdd). I'm using grub2 to manage several OS's (two debian, one ...
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605 views

4 SSDs RAID 0 integreted vs dedicated controller

I've been thinking about setting up 4 SSD RAID 0 to gain performance in my home PC, and I ran into this review of PCI-E based SSD. If I use PERC H310 (8 lane PCI-E 2.0 RAID controller, which means ...
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39 views

Add space from 3TB unto 4TB using raid, how?

I would like to expand my 4 TB drive by adding on drive space from my 3 TB drive. I assume this is possible in a raid configuration by resizing the partion on the 3 TB to free space then using ...
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38 views

Why does my dynamic disk say it is not formatted after a power loss?

I have a Windows Dynamic disk of three 3 Terabyte drives in a single spanned volume. Today I experienced a power loss and didn't get to turn my computer off before my UPS died (I guess I shouldn't be ...
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40 views

Recover RAID 5 with 2/4 failed drives

This Sunday one of my personal RAIDs disks failed. Stupidly, I thought, whatever, that's what I have a RAID for, I'll get a new one to replace it tomorrow. Barely two hours later it starts beeping ...
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326 views

MDADM RAID-0 does not increased size after grow on AWS Linux with EBS

I wanted to grew a Raid0 from 2 disks to 3 (each 1TB EBS on Amazon AWS) but the size did not change thereafter. The RAID started with two disks sdc and sdd and the new one was sdf. Here is the ...
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53 views

Power Supply vendors/part numbers for Promise NS4300N?

Good morning all! My problem is relatively simple: I have 2 Promise NS4300Ns, both have dead power supplies. Disassembling a 3rd yielded a Mini-ITX format power supply with a proprietary power cable. ...
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53 views

3 small disk RAID5 -> 4 large disk RAID6 upgrade. Add drive or replace drives first?

I'm going to upgrade my Synology NAS from 3*1TB/RAID5 to 4*3TB/RAID6. Which is the better approach (and why): a) Add 1 new 3TB disk, and convert the group to RAID 6, then swap the remaining drives ...
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28 views

RAID Controller Compatibility for P67

I have a RAID 0 array created using a Sabretooth P67 motherboard's on board RAID controller. This uses the intel P67 chipset to create the RAID. The motherboard has died but (so far as I know) the ...
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321 views

Doing a clean install of Windows 8.1 x64 on a SSD - should I use RAID or AHCI?

when i first setup my computer about a year ago, i left it at the default AHCI when i installed windows 8. after doing so i was told by a computer tech that i should've just used RAID. i was confused ...
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77 views

Recover RAID 0 Array after motherboard failure

I have a RAID 0 hardware RAID array (using the motherboards RAID controller) on two SSD hard drives (C) and a third drive (D) in a non-RAID configuration. I have a new computer already ordered and ...
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47 views

Ideal Setup for vSphere Hypervisor

I just picked up a Dell R720 for my company, it's got plenty of resources where I feel I can run multiple VM's at the same time. Here are the specs. Intel Xeon E5-2620 (2) 8GB DIMM (8) 146GB SAS ...
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50 views

Is a raid array transparent?

I am attempting to create a RAID 5 array of 4 disks using an on board SATA RAID controller of a ASUS H87 mini ITX motherboard. The OS I am attempting to install is UBUNTU 14.04.1. I have successfully ...
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37 views

Dual boot, 4 disks, raid0

I have windows 8.1, and ubuntu 14.04 on the Disk 0. On ubuntu the four disks are merged. on windows i want to merge disks 1,2,3 (the windows half). but when i click to new striped volume, it says ...
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513 views

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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221 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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25 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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351 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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749 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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47 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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29 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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238 views

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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93 views

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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122 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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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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212 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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53 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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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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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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164 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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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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155 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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70 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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91 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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41 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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1k 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 ~1 minute. It then ...
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437 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 ...