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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Mirror / backup laptop btrfs drive to sometimes connected external USB disk

I have a laptop with an internal drive using btrfs. There are several subvolumes and snapshots on here. I want a copy of this drive to be made periodically to an external USB disk of approximately the ...
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Can't boot from mirrored disk (software raid 1)

I make mirrored disk (software raid 1) on windows 7 and shut down my computer normally, but rebuild process not finished. And after that my computer can't start up, it hangs at "Verifying DMI pool ...
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Procedure for repairing degraded array with 3ware

I have a machine with a RAID-6 array made of 8 drives. The 3ware monitoring utility, tw_cli reports that one drive is degraded. So, I need to replace it. Online, I find these instructions on how to ...
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RAID 5 setup across SATA II/III

I have an ASUS P8Z77-V LK mobo with 4 SATA 3Gb/s and 2 SATA 6Gb/s. I'm considering purchasing 3 WD7500AZEX HDD's and putting them in a RAID 5 configuration. My question is, if I put the two ...
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21 views

Thunderbolt or USB 3 for a RAID? (drive speeds)

I am about to purchase a 4-disk enclosure to house a RAID10 volume. My question is, do I really need Thunderbolt, given that it's so much more expensive than USB3? This is my thinking, please let me ...
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Safe to blank MBR of a disk after adding it to an RAID1 array with mdadm?

I created a RAID1 array of two disks, /dev/sda and /dev/sdb, using mdadm. After several booting problems related to the BIOS and SATA/RAID controller of the board, I accidently created some new ...
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Which has faster read/write speeds an external hdd raid or external single ssd

I want to move data to an external hard drive AS FAST AS POSSIBLE and I was wondering whether it would be better to have 2 HDD (7200 rpm or higher 500GB each) in an enclosure running RAID 0 or a ...
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How do I resize software RAID partitions in Gparted Live?

I have a linux-RAID partion that I want to extend into empty space non-destructively. In Gparted it has a lock symbol and right clicking the partion brings up greyed out options. But on the Gparted ...
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58 views

How do I fix my RAID array after NVIDIA GeForce Experience mangled it?

Alright, so I decided to try upgrading my graphics card driver today. I believe my previous version was 331.40 for my NVIDIA GeForce 580. I also have a GeForce 9800 for PhysX. So I started about an ...
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How can I re-establish my RAID5 Array (Intel Rapid Storage)?

I had a RAID 5 array, but two of the drives dropped from the array. (While troubleshooting another issue ASUS suggested I update my MoBo BIOS, but neglected to tell me this would corrupt my RAID ...
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36 views

How to recover RAID0 lost after a upgrade to Windows 8.1

How can I recover software RAID 0 after formatting my primary OS drive? I had the same issue as this post : I was previously running Windows 7 on a machine that had 4 physical drives and 1 SSD for ...
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Repair windows 7 software RAID

Sorry that some of this is vague, I wasn't onsite when it happened and am preparing to go in tomorrow and try to fix things. We had a Windows 7 PC that had 2 disks in a software RAID configuration. ...
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32 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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30 views

Cloning HDDs from a hardware RAID array?

Is it possible to clone the individual disks of a hardware RAID to get a copy of the contained array? I have an Adaptec RAID controller. I put it offline, attached the RAID member HDDs to a regular ...
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29 views

How to proceed after creating software RAID 1 array on Linux

So, I've created a RAID 1 array using two 500 GB hard drives. I used a Linux Mint Boot Disk, and then used mdadm to create the RAID 1 array using 2 hard drives, each which has a single primary ...
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Software Raid 0 (4 disk) and Windows Upgrade

I have software raid 0 (4 disk 1TBX4) on windows 7 professional. I want setup new OS (Server 2012 R2) Is my data is lost if upgrade? Thanks for help.
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26 views

Intel RAID verification and repair

Intel has a web page that describes how its Rapid Storage Technology verifies and repairs RAID volumes. For RAID 1 and RAID 10, it does the following: Data on the mirror is compared to data on ...
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26 views

Setting up software RAID 1 on Linux

So I'm trying for the first time to create a software RAID 1 array and install Linux (Mint) on it. I've physically installed 2 500 GB SATA Seagate drives, and now I want to create a RAID 1 array. ...
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HDDs occasionally “click” and dump this error

Every once in a while, my HDDs (6 1TB drives in a Linux md RAID-6 array) make a brief "click" sound, and I get this from dmesg. I don't really have any clue how to start diagnose this, or even how ...
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39 views

Why RAID1 is resynching so long?

I have created RAID1 array of two identical empty partitions. Now it is saying: $ tail -f /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : ...
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22 views

Does RAID1 really protect me?

I have 2 drives mirroring each other. They are pluggable and occupying 2 SATA slots. Totally I have 5 SATA slots. Can I freely unplug RAID parts and then plug them back and have data intact? If not ...
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28 views

Intel Rapid Storage Technology RAID - what can you schedule?

I am about to get a new laptop and I am considering using the Intel firmware RAID to set up RAID-1. I am researching what features it has. I found the following screenshot of the Intel Rapid Storage ...
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How do I know if one of my RAID 1 drives died?

Lets say I have a few HDDs in a RAID 1 array. From where will I know that one of my HDDs is dead? Is there some kind of automatic alert system or do I have to check it manually? If I have to check it ...
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How to enter RAID config on ASUS P7P55-M motherboard?

This motherboard is said to support Intel Matrix Storage Technology Support RAID 0,1,0+1,5,10 https://www.asus.com/Motherboards/P7P55M/specifications/ I am not familiar with this technology. ...
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Windows 7 Installation - HP ProBook 650

I Recently bought a HP ProBook 650 with Windows 7 preinstalled. Now I want to do a clean install of Windows 7 with my own image, so not the recovery disks that where included in the box. It appears to ...
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25 views

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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7 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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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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82 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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417 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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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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76 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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Creating BIOS Raid on the Asus Z87M-Plus

I am trying to setup a BIOS RAID with 4 WD RED 2.0TB. SATA Mode is set to RAID Mode in the BIOS. During Boot I hit Ctrl+I to get to the RAID tool. Now comes the part whee I get stuck. I select ...
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36 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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134 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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1answer
88 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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36 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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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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23 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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69 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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24 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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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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33 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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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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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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25 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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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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101 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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40 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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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 ...