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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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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11 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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664 views

Windows 7 NON-Boot 6TB array results in a limited, 2048GB “disk”

I have Windows 7 using an LSI 3Ware 9650SE-8LPML with 4 of the WD Green 2TB drives. I've done a bunch of reading on this; I'm not using it as a boot, and the array has no data; it can be deleted and ...
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1answer
456 views

Raid rebuild and resize after replacing larger disk

I have a Raid 1 with 250 and 500 GB disks on 3ware 9650SE-2LP Windows Server 2008 and I have right now only 500 GB disks to replace temporarily the failed 250 GB drive. I understand that the ...
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1answer
382 views

Does RAID 1 allow using the entire drive or does it entail some overhead?

I have a Synology NAS DS211j with two 2TB hard-drives mounted in RAID 1 (mirror). (By hard-drive manufacturers’ measures—1GB = 1000MB—the “real” size is closer to 1.8TB.) I rarely access this NAS and ...
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5k views

Is it possible to create a software RAID 1 with different sector sizes?

I bought a hard drive of a different model to my main drive and tried to mirrored them, but the following error message came up in Windows 7 Virtual Disk Manager: All disks holding extends for a ...
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8answers
16k views

Should I use “Raid 5 + spare” or “Raid 6”?

What is "Raid 5 + Spare" (excerpt from User Manual, Sect 4.17.2, P.54): RAID5+Spare: RAID 5+Spare is a RAID 5 array in which one disk is used as spare to rebuild the system as soon as a disk fails ...
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24 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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161 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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2answers
425 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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54 views

RAID Storage shared between OSs

What is the best solution to sharing a RAID array between two OSs? I'm planning on installing Win7 and Ubuntu in dual boot, either on the same SSD or two seperate. I also want to have two drives in ...
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1k views

Make two disks appear as one big share on LAN

I bought 2 x 2TB disks for a NAS server, (linux debian). I want to make both drives appear as one big 4TB disk on the LAN. This can be done with software RAID (JBOD) or LVM I suppose. There are other ...
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1answer
243 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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36 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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2answers
176 views

Broken motherboard hardware mirror - getting data from the hdd or from its image

I got a computer (Windows 2003 server) with broken motherboard. The board using an onboard hardware raid and have 2 HDDs in mirror configuration. Trying to find a replacement board will take some ...
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2answers
351 views

How to replace hard drive in RAID 5 Array and keep data intact?

How would I go about replacing a defective hard drive in a RAID 5 array while keeping the data intact? I have a Highpoint Rocketraid 2720SGL RAID card.
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1answer
85 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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41 views

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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3answers
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How-to change the name of an MD device (mdadm)

Here is the output from mdadm -Esv: ARRAY /dev/md127 level=raid0 num-devices=2 UUID=d89d9d45:9a420812:c44c77eb:7ee19756 devices=/dev/sdb8,/dev/sda8 This is a v0.90 array. The question is as ...
0
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1answer
603 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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4answers
10k views

Firmware vs OS RAID (aka Windows 8 Disk Mirroring vs Intel Onboard)

So Windows 8 is out and I have a new motherboard. I wish to create a RAID 1 coupling between two HDDs -- for storage purposes only (my OS is on an SSD) -- but I don't know which is the best route to ...
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59 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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7answers
5k views

What RAID configuration is most appropriate for a home user?

I have a computer for general home use and mild gaming (not upgraded the graphics card so still on AGPx8). It is currently configured for striped access over two 80GB disks. Is this the best option? ...
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65 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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172 views

Switch HDD mode from RAID to IDE [closed]

I made an ghost of 2 drives that were installed as raid 0 I made a ghost to one big drive. Now in the bios, the big drive can only run in raid0 modus. Is there a easy way so I can run this drive as ...
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41 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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4answers
6k views

Enabling raid 1 for an existing windows 7 64-bit boot drive on ich9r

My system is asus p5k-e/wifi-ap with ich9r chipset. I am running windows7 64-bit ULTIMATE on my boot drive. I recently got an identical drive. I want to enable raid 1 without reinstalling ...
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3answers
9k views

Why is RAID5 disabled in windows 8?

I want to create a RAID 5 array in windows 8 with 5 Dynamic Hard Disks and it is grayed out. If this is not possible why not hide that option. If it is possible why it is disabled? after your ...
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1answer
284 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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2k 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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32 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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175 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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1answer
3k views

Possible mdadm RAID states?

I'm writing a monitoring plugin for a home server RAID, mdadm on Ubuntu 10.4. Using sudo mdadm --detail /dev/md0 I get output like this: /dev/md0: Version : 00.90 Creation Time : Thu Dec ...
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367 views

XFS: Mount overrides sunit and swidth options

I have a 9TB XFS partition consisting of four 3TB disks in a RAID-5 array with a chunk size of 256KB, using MDADM. When I created the partition, the optimal stripe unit and width values (64 and 192 ...
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33 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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36 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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86 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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1answer
122 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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4answers
1k views

Linux software RAID robustness for RAID1 vs other RAID levels

I have a RAID5 array running and now also a raid1 that I set up yesterday. Since RAID5 calculates parity it should be able to catch silent data corruption on one disk. However for RAID1 the disks are ...
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27 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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3answers
2k views

Need to find which drives are mirrored within RAID-10 array

I have a home media server running on openSUSE 12.2. I'm using eight 2TB drives in a RAID-10 configuration. I deliberately bought two different types of drives: four Seagate Barracuda Green and four ...
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0answers
37 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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22 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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1answer
177 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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66 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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40 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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1answer
42 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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0answers
33 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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509 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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1answer
59 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 ...