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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RAID terminology

In the most general sense what is an array and what is a group (also what's a virtual drive)? From here: Redundant array of independent disks (RAID) is a storage technology used to improve the ...
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When setting up RAID, what does the option “data protection” mean?

I'm setting up a RAID and it has the option "data protection". By default it's disabled but can be changed to enabled. I google searched and found this Data Protection: Use this item to enable or ...
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Adaptec Raid Controller 6405E slower than onboard raid?

Running on Windows 8.1 x64. Raid is 0 on two Samsung Evo SSD. Both read and write cache is enabled. Here's result from onboard raid (ASUS-P9X79-E-WS): And here's from the dedicated raid controller ...
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91 views

Can't read from the source file or disk on RAID 1 drive

I am getting the following error "Can't read from the source file or disk" when trying to copy a large file. I get the same error no mater what other drive I try to copy it to (which makes sense as ...
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Bios Raid and Windows that wants to format them

I shutdown my PC improperly by holding down the power button. Now Windows sees 2 HDD's with a RAW filesystem instead of my RAID. After the fast shutdown my raid went though the "Verify" stage with 0 ...
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How to detect RAID 0 from Ubuntu Live CD?

I have Ubuntu 10.04 installed on a server with RAID 0 configuration. The server has many user accounts and the users have a lot of data in the server. The server has been crashed due to removal of ...
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51 views

Automatic ESXi backups, is this possible?

Since ESXi does not support software RAID, the only option would be to use a hardware RAID controller. However, I would like to avoid buying one for a while, until I finally decide to keep using ESXi ...
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116 views

On-board RAID vs Hardware RAID

They technically are both "hardware" raids, but what really sets the two apart? Wouldn't on-board raid basically be a software raid since they share the same processor.
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74 views

Hardware RAID vs. Software RAID [duplicate]

What is the big difference between software RAID and hardware RAID at the low level? What is really going on that sets the two apart? As far as I know, the only difference is the RAID card can have ...
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768 views

Does windows 7 disk manager mirror disk or partitions?

My servers Raid 1 disappeared when I did a bios update, And now in order to get it back I have to format my 2 * 3tb hard drives. Which isnt really a solution for me. So I have desiced to try and make ...
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683 views

RAID5 vs RAID4 purpose of floating parity

I still did not get why is RAID5 better than RAID4. I understand both computes parity bits that are used for recovering if some failure occurs, the only difference is in storing those parity bits. I ...
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58 views

How to determine which drive in a firmware RAID is failing

I have two drives in an Intel ICH10 RAID 1. They are not enterprise-level drives; just regular WD Caviar Black drives. Recently, reading/writing to the mirrored volume has become extremely slow and ...
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572 views

How can I restore RAID 0 on my DELL laptop?

I have been formating my dell laptop for quite a while, I bought it back in 2012, with one year warranty, it ended last august, but I think since the moment I formatted it to windows 8.1 I probably ...
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286 views

HP ProLiant ML350e Gen8 - Ubuntu 14.04 LTS [closed]

I was researching about new Ubuntu Server 14.04 LTS and the Proliant ML350e Gen8 with B120i RAID controller and I found that HP certified Ubuntu without RAID engine on 12.04 server version, but now I ...
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105 views

gdisk doesn't recognize RAID0 disk as size of whole array?

I put in two Samsung 840s at 256GB and RAID-ed them together and installed Windows 8. I'm having trouble using gdisk to get ready to install Linux. gdisk sees the array, /dev/sda0, as a whole ...
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118 views

How does performance scale in a single column 2-way mirrored storage space as more disks are added?

In Windows 8.1 Storage Spaces, there seems to be pretty solid evidence that 2-way mirrored storage spaces have performance that improves significantly as more disks are added to the pool as long as ...
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111 views

linux - centos won't boot after rebuilding raid

I have a dedicated server with OVH. Yesterday they had to replace one of the HDD because it was about to fail. After replacing the disk, we had to rebuild the RAID and now the server won't boot ...
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Is it possible to build RAID0 or RAID1 using 2 disk when one disk is not cleen?

I'm using win 7.Is it possible to build RAID0 or RAID1 using 2 disk when one is not cleen? I have 2 same hdd disks, one of them cleen and one with data. I want to build RAID0 or RAID1 (on the fly) ...
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MDADM RAID 5 disk missing after reboot

I have a server with 6 disks (4x2TB + 2x4TB). I put the 2TB disks in 2 RAID 0 and the resulting 2 4TB RAIDs with the 2 4TB disks in a RAID 5 array. The RAID works fine until I reboot the server. After ...
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212 views

Fedora 20 stopped booting after migrating to RAID array

I have decided to migrate my working Fedora 20 installation onto RAID-1 software array. After this operation, I have a problem with booting my system. Background My machine is MacBook Pro (Early ...
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41 views

Do single bit errors during raid 5 rebuild currpt the entire array?

Does a single bit error during a raid 5 rebuild break the entire array? if so, why? If a single block of data was corrupted/misread during the rebuild, would that not simply result in one block of ...
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17 views

Reset Windows Server password [duplicate]

I'm trying to reset a password for local administrator for a server running 2008 R2 in raid. I tried using spotmau(doesn't see operating system at all), hiren's boot cd(sees administrator, made ...
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138 views

CentOS Gnome only showing 1TB on 6TB Server?

I just bought a new server and want to use it to store files, It has 2x 3TB hard drives. I Set them up in raid 0 as i don't need any redundancy. I don't know much about servers and command-lines ive ...
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223 views

Dell Precision T3500 Intel Rapid Storange Technology shows no Acceleration option?

I have a Dell Precision T3500 with a 2TB HDD with my OS installed and a brand new 128GB SSD which is not formatted. The SATA mode is set to RAID in BIOS and the latest version of the Intel Rapid ...
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83 views

Is there a chance to lose data if I switch RAID to AHCI

I have Windows 7. The boot drive is NON-raid SSD. I also have 2xHDD RAID1 (just data). RAID is Intel Matrix (or whatever the latest name for it). I installed Windows in RAID mode What might happen ...
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124 views

Is hardware RAID worth it? [closed]

I am planning to build a home NAS server, and have managed to get my hands on the following- Core i3 3220 Ivy Bridge CPU 4 GB Kingston RAM Basic motherboard with dual gigabit LAN port 4x WD 3TB HDDS ...
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Is it possible to change a Dual SATA RAID enclosure to a NON-RAID enclosure?

just wanna know if it possible to change a Dual SATA RAID enclosure with a normal USB2.0/3.0 enclosure, like change it to single HDD drive. will it have any problem like cannot detect on PC? Cos I ...
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2k views

Detecting when a server is running on UPS battery

I have a home server (HP Proliant ML310 G4) that I bought from my employer a month or so ago. The server runs Debian Linux and I use it for just about everything. I can get away with doing this ...
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93 views

Booting EFI disks in BIOS system

I have a Debian-based system with three drives in it. All three drives have the following partition layout: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 4001GB Sector size (logical/physical): ...
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164 views

Synology DS1010+ shows degraded under status

As the title says I've got an error on my friend's NAS this evening. Even when I check that disk, it said that it's "abnormal" under smart test but the status shows "Not initialized". Under the ...
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138 views

What is “2LUN” mode in connection with RAID?

I've came across RAID products that also list JBOD (just a bunch of disks) mode and 2LUN mode. What the heck is 2LUN mode? I could not find a description; the closest thing seems to be LUN 'logical ...
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36 views

Why do you lose a drive when configuring RAID 5?

RAID 5 requires a minimum of three disks in order to work. Say each disk is 2 TB, and you have four disks, for a total of 8 TB. In RAID 5, your total capacity drops to 6 TB. Why? If the "spare disk" ...
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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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2k views

How to configure raid on Gigabyte GA-970A-UD3

I am trying to setup RAID 0 in the BIOS of my motherboard: Gigabyte GA-970A-UD3. I have enabled RAID in the BIOS SATA mode, and I get the option to hit Ctrl+F to enter RAID option ROM utility. When I ...
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1answer
56 views

Do i need a motherboard that supports raid to use a raid controller?

I want to setup a raid 0 to run windows on. Because windows will not run on a dynamic disk, I want to use a pci express raid controller to be able to install the os on it... But i have a few ...
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128 views

Why is windows server 2008 resyncing new raid 5 array?

I have setup a software raid 5 in windows server 2008 standard, immediatly after creating it now says resyncing. What is it resyncing when there is no data on the volume? Is it safe to write data to ...
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69 views

RAID1 for storage only without reinstalling Windows

I have a Z87-A motherboard. My main (Windows/Program) drive is Samsung Evo 840 256GB SSD and my storage drive is a 2TB Seagate Barracuda HDD (ST2000DM001). I bought another one of the Seagate HDDs for ...
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How to enable Samsung EVO 840 mSATA SSD Self Encrypting Drive with Intel RST RAID 0

I have an MSI GT60-2OD (Haswell MB, UEFI enabled w/o CSM) with 3 Samsung EVO 840 mSATA SSD drives in RAID 0 mode (Intel RST AHCI RAID Controller Miniport aka Intel(R) Mobile Express Chipset SATA RAID ...
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How to set up parity for spanned volumes

I am looking for a way to make parity backups of my data that i store on a large spaned volume... Ideally i would use raid 5, but i have drives of many different sizes, and would like to use all. What ...
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60 views

Skip initial resync on a new Windows software RAID 5 build?

I just added 8x4TB and created a software RAID5 volume. Server 2008R2. Based on progress so far, it's going to take 8 days to complete the resync. I'm not a busy man, but that's asking a lot. ...
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96 views

Setting up a RAID 5 Array

I am currently trying to convert my drives from just a bunch of external disks, each one individually shared from my (CentOS) server into a RAID array (ideally, RAID 5). At current, my drives are: ...
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Ubuntu boot through failed RAID

I have a large media partition as a separate RAID5 on my Ubuntu server. The server is not easily accessible, so I need it to continue the boot process in all but the most dire circumstances. Right ...
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1answer
1k views

Intel Rapid Storage Technology RAID Setup always shows on system startup

Is there a way of getting the Press <CTRL - I> screen to not show on startup? Or is it permanently there as long as I have RAID?
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Raid 5 for more than one failing disk [closed]

RAID 5 works the following: Disk1 | Disk2 | Disk3 A | B | A xor B A xor B is called the parity and it can be on a different disk for different blocks. Now, whenever one disk fails, one can ...
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365 views

How to configure RAID 1 on Intel Rapid Storage, and partitioning design

I would like guidance on setting up a RAID 1 system from BIOS with Intel Rapid Storage. System details: I have Click BIOS II running on a MSI motherboard (Z77A-G43). I also have 2 x 2TB hard drives. ...
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64 views

SAS and SATA together in a RAID

I have to build a new server with SAS drives for RAID 10. However, I have 2TBs of storage on 2x1TB SATA drives. Would it be possible to still plugin 2 SATA drives even if I run a hardware raid 10 ...
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176 views

Hybrid Raid-1 HDD + SSD — Write Intent Bitmap

I am currently running a laptop with 1 HDD and 1SSD. I currently am using mdadm to put some partitions in a raid 1 configuration with --perfer-write set on the HDD. I have this working correctly ...
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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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Protect HDD File access from Live CD

How can we protect our files from copying through another PC or Live CD (Physical Security)? Is it possible to use RAID and secure our data? My os is Linux. Can recover Raid FS from other OS?
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75 views

New Install, Win 8.1 Access over 2 TB

new install, Z87 pro MB, Win 8.1 64 bit, UEFI based. I have 2 TB drives, configured in a RAID 1+0 config, so end result is approx 4TB useable, and windows shows this. The problem is that while I can ...