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 0: how identical do the drives have to be?

I have a spare 1Tb. Seagate Barracuda HD, and I was planning on buying another one and creating a RAID 0 array using my motherboard's SATA controller... but I have a doubt: how "identical" do the two ...
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2answers
177 views

RAID 1 using three drives

Before you go say that RAID 1 mirrors one drive and cannot mirror twice, that's not what I mean. I have a WD Black 2 TB HDD and 2 WD Blue 1 TB HDD. The WD Black is to be the main drive, and ...
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4answers
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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20 views

Ubuntu Server 12.04. Software RAID1 state degraded with a spare drive

After a disk failure, this is the output of mdadm --detail /dev/md2 in my Ubuntu Server 12.04: /dev/md2: Version : 1.2 Creation Time : Thu Dec 27 10:51:42 2012 Raid Level : raid1 Array Size : ...
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1answer
2k views

Shrink RAID by removing a disk?

I have a Synology NAS with 12 bays. Initially, we decided to allocate all 12 disks for a single RAID-6 volume, but now we would like to shrink the volume to use only 10 disks and assign two HDDs as ...
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2answers
1k views

Using smartmontools to check on Intel RAID arrays

I have a Windows 7 box with a two-drive RAID 0 array created using the motherboard's SATA controller (Intel ICH8/9). Since I can't access the SMART status of the drives in it (because they are ...
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1answer
55 views

How to force System Reserved to be created on the boot disk drive

I have machine with three disk drives - Disk 0 500 GB SSD - Disk 1 4TB Mechancial Drive - Disk 2 4TB Mechanical Driver I am installing windows 8.1 on this machine with SSD being the c:\ ...
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48 views

4T RAID 0 Partitioning issue

I am building a new workstation 1.2T 10K SAS X 4 for Win 7 Pro SP1 x64 I must use RAID 0 for this workstation. What I would like to have is C = 500G D = rest of spaces So BOIS based system with ...
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2answers
109 views

Create a Spanned drive with 3 external hard drives

I'm trying to create a merged drives from 3 externals drives (2*3Tb + 1 * 2Tb) on Windows. I went to diskmgmt.msc and tried to create a spanned drive, but i keep getting the error "Operation not ...
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45 views

2x3tb vs 3x2tb RAID drives for home nas [closed]

2x3tb vs 3x2tb RAID drives for home nas What's more reliable if both of them cost the same money? 2x3tb in RAID 1 3x2tb in RAID 5 From my perspective removing one failed drive of 2tb is cheaper ...
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29 views

cloning drives to correct RAID 10 failure

I don't type questions like this very often, so I apologize if I could have made it clearer. I have 4 HDD slots in which I had a RAID 10 array setup. It is a motherboard software RAID so clonezilla ...
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63 views

SSD's or HDD's in a LANcache?

I am building a LANcache for a lanparty that I'm organizing. We have about 80 visitors (pretty small LAN), but our uplink is limited to 100mb/s due to reasons and it's constantly saturated with game ...
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0answers
57 views

Intel RAID not detected after rebuilding PC - recovery options?

I'm running a RAID0 array on a Windows 7 PC with an Intel ICH10R SATA chipset, consisting of 4 x 4TB drives (plus a separate drive for the OS). I re-built my PC after getting a new case, and cleared ...
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1answer
27 views

Is there any reason to replace a failing disk in a raid10 before it has completely died?

My home server has four 4TB disks configured as a RAID10. I've gotten a few messages recently suggesting that I'm about to lose one of my disks: $ WARNING: Your hard drive is failing Device: ...
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63 views

SSD cache, SRT, Raid 0 : speeding up my C drive

I have a Z97 rig and I'm interested in speeding up my disk drives. This is my current setup: 1) 240GB SSD for main disk 2) 500GB hard drive for User Files 3) 120GB for photo editing (I move files ...
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29 views

Is a btrfs RAID1 mountable if the added device isn't available/offline/failed/degraded?

Assume I created a RAID1 with btrfs's functions (btrfs device and btrfs balance subcommands instead of mdadm) like so: btrfs device add /dev/sdxZ /dev/sdxY btrfs balance start -dconvert=raid1 ...
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1answer
43 views

Intel Software Raid: Downgrade from RAID10 to RAID 1

My configuration Windows 8.1 Asus Z87I Pro (Rev C2) 4x WD Red 3TB, set up as RAID10 in the Intel tool / EFI My target I want to remove 2 of the HDDs permanently from the RAID because I don't ...
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39 views

Should I replace HDD in raid array every N years even if disks aren't corrupt?

Typical scenario: I made a raid 1 array out of 2 disks, that contains data I wouldn't like to lose. I found that average life-time of HDD (rotating drive) is 3 - 5 years. Does it mean that if the ...
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5answers
48k views

Which software raid modes does each version of Windows 7 support?

Being familiar with the software raid modes and dynamic disks from the server versions, I was wondering if there is a document or even just common crowd knowledge that indicated what software raid ...
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2answers
74 views

RAID solutions for a home server instead of ZFS [closed]

I’m using Ubuntu Server with 4 2TB disks and I’ve been using ZFS for around 8 months on my HomeServer. But now I have reached the capacity of my pool, so I want to purchase a new drive and add it to ...
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1answer
17 views

Error RAID1 but can't seem to find where the error is?

I'm having trouble figuring out where the problem is. I'm seeing my two drives... I removed a failed drive and installed an empty one. Thought I added it to the raid and it said it was rebuilding. ...
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48 views

XFS filesystem spanning drives and allocation group alignment

I have a query regarding creating an XFS filesystem on what is commonly incorrectly called a JBOD volume, that is, linear RAID or Spanning raid. I have two hard drives (1.5T and 2T) that I want to ...
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2answers
166 views

Putting two physical hard drives in a single 2.5" bay?

My crazy brain came up with this ridiculous idea. "Why can't I have a single 2.5" drive device that actually contains two independent hard drives? I want RAID 1 data mirroring and the security of ...
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29 views

Removed drive from NAS not recognized when plugged in via USB

I'm having a problem accessing the data from a drive that was in my NAS but is now plugged in via a USB caddy. This drive was not in a RAID array as it was a volume with a single disk. Although it ...
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1answer
36 views

how can I reintegrate a lost and found pv into an LVM vg?

I recently lost a RAID that was a physical volume of one of my linux LVM volume groups. I ended up doing a vgreduce --removemissing and got on with the business of restoring the data. Well, today I ...
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1answer
5k views

How much slower is a RAID 1 hard drive compared to no RAID?

How much slower is RAID 1 than no RAID at all? I have heard that RAID 1 provides peace of mind (because of mirroring) but gives slower write (not read) performance.
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29 views

Linux soft RAID5 array with mismatched events won't assemble

The last three nights, one of my USB controllers has gone offline in the middle of the night, knocking 4 of my 8 disks offline. The first two times, I was able to get it working again with mdadm -A ...
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2answers
81 views

Does setting BIOS SATA RAID/AHCI mode to RAID will activate RAID operation upon new hard disk insertion?

Each BIOS 'SATA RAID/AHCI' mode comes with at least 3 different mode - Disable/IDE or RAID or AHCI. Does setting the 'SATA RAID/AHCI' mode to 'RAID' will cause the following: RAID 1 activated when ...
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75 views

Does switching SATA/AHCI mode in BIOS affect Windows OS and data in the hard disks

Suppose the following situation: Each desktop machine have 3 internal SATA hard disks of different sizes (500GB, 1TB and 2TB) The BIOS have 3 types of SATA/AHCI mode (Disabled/IDE, RAID and AHCI) ...
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112 views

AHCI and RAID for BIOS settings when using 2 or more SATA hard disk

My third-hand desktop machine have the following BIOS settings: At what scenario should I choose 'RAID' and what scenario should I choose 'AHCI' and what other scenario should I choose 'DISABLED'?
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25 views

Disconnect a RAID 1

I currently have a setup of a 2 disks in RAID 1. How-ever I'd like to disconnect the raid and only run off one disk. Is this possible? Or will I have to reinstall the system? The RAID is a soft-raid ...
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27 views

Drives not working after failed factory reset of NAS?

I got an old ReadyNas 1100 that had 4x500GB drives from start. One gave up so there were 3. I thought I should by some upgrade disks and went ahead and bought 2x2TB. Now begin the dream. I just ...
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69 views

AMD RAID Configuration SSD+HDD

Today, I bought a new components for my HTPC and as usual, I went with Gigabyte Motherboard. This time, I bought an AMD board: GA-F2A88XN-WIFI. Besides the board, I bought a Kingston Fury 120 GB SSD ...
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2answers
4k views

Can I setup two RAID arrays on a single intel z97 controller?

Let me preface this by saying that I have never setup a RAID array myself, other than by using software RAID 0 in Windows for a set of storage drives. I purchased a new ASUS Maximus VII Hero ...
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1answer
752 views

Btrfs: RAID 1 on 3+ devices

I currently have a Btrfs partition with four devices: three 3 TB drives and a 4 TB drive. Data and metadata are RAID 10, so I have 6 TB of usable space, which is almost full. I'd anticipated that RAID ...
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37 views

Recover data from non-RAID SCSI drives on Dell PowerEdge

I have two old Dell PowerEdge 1750 servers. Server A has failed physically, and I need to restore some data from it's hard drives using server B (I do not have any other hardware that can work with ...
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0answers
691 views

How to create a Mirrored Volume in Windows 8.1 - mirror option missing

I am trying to create a mirrored volume (RAID-1) in Windows 8.1 (standard edition, not Pro). This is a new Windows 8.1 installation. I have two 500GB drives attached to SATA ports, neither of which ...
0
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1answer
116 views

Unclear on how to enter and setup the RAID BIOS on a GIGABYTE GA-Z77X-UD5H LGA 1155

I have two Samsung 850 Pro 256GB SSD’s hooked up to a GIGABYTE GA-Z77X-UD5H LGA 1155. When I enter BIOS, it shows that I have two of the drives connected, and I have my SATA mode selection set to ...
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1answer
49 views

Internal SDD + External SSD (via firewire) RAID 1 and boot drive version control (like system-wide git)

I was thinking in a theoretical realm about a certain use case, and was wondering if anybody has ever experienced anything like this. If I were to set up my internal SSD and an external SSD ...
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1answer
721 views

Windows 8 keeps deleting files from RAID drive

I have an ASRock Z77 Extreme4 motherboard with Windows 8 (not Pro). Brand-new computer, built from new parts. I use a 600GB drive (10,000RPM) as boot drive (let's call it HD1) and 2 3TB drives in a ...
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0answers
145 views

Exchanging harddisk of Medion Akoya MD-98634 laptop

I am trying to replace the original 1TB harddisk of my Medion Akoya (MD-98634) with a Crucial BX100 SSD (250GB). This is what I found out so far: The original setup is running the 1TB HDD in a RAID ...
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39 views

Linux machine with RAID 1 not booting after failed drive

I’m not that experienced with Linux and am troubleshooting a machine that is no longer booting up. Originally it had two drives installed in RAID 1 and one drive failed. I took the good drive out and ...
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1answer
175 views

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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1answer
142 views

Recovering 1TB hard drive split into two 500GB drives without formatting

I am using Windows 7 and am trying to recover two working drives. The hard drive in question was: http://www.newegg.com/Product/Product.aspx?Item=N82E16822204022 I am pretty sure they were ...
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84 views

Why does UEFI BIOS only identify a 2TB drive on a 25TB virtual drive?

I configure a RAID6 using 16 2TB disks, and finally get a 25TB virtual drive as shown in LSI MegaRAID BIOS. And then I boot via a USB stick and try to install 64bit Ubuntu 14.04 on it. At the ...
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31 views

Cannot get RAID working with Mac Mini after adding drive

I had a working RAID array with 3 2TB drive in an external Startech.com SATA enclosure that was set to RAID5 I wanted to add another 2TB drive, so I added the drive but according to the manual, I ...
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1answer
446 views

How to install linux mint 17.1 to encrypted raid 0 array

I just got a new SSD and I wanted to install Linux Mint 17.1 to a raid 0 array of SSDs. I also want the array to be encrypted. I tried the following guide and got mdadm to setup a software array and ...
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45 views

How to configure RAID on Toshiba Satellite P500-15e laptop?

I had bought a laptop (Toshiba Satellite P500-15e) when studying in France. Once I installed OpenSuse linux and regarding the fact that I didn't know anything about it, I had to erase it. ...
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2answers
51 views

RAID 1 accidentially booted in AHCI mode

I have two Samsung 840 EVO SSD's in RAID 1 (Asus P87-Pro and Intel Controller) with Windows 8.1 Pro on it. After a BIOS update, apparently all BIOS settings was reset, which apparently changed the ...
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1answer
58 views

Mix 3 different sized hard drives into a RAID 5

I’ve got three hard drives different sizes and I want to create a RAID 5. The three drives—all Seagate—are: 1.5 TB 3 TB 700 GB Is there a way to RAID these or is it possible to do the folloiwng: ...