RAID 1 is the official name for mirrored disks or volumes

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How can I create a software RAID mirror of the system drive after installing Windows 8.1 Pro 64-bit?

I have a brand new system with UEFI Install of Win 8.1 Pro 64 Bit. The OS is installed on a 1TB WD Drive I also have a second 1TB WD drive that is empty alongside it. They both are GPT. I'm having ...
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What will happen if I reconnect 2 halves of two-way RAID mirror after using them independently?

Suppose I have a storage space with two-way mirror based on 2 physical USB drives a and b. Then I disconnect b and connect it to another computer. Then I use—write some data—to both degraded storage ...
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210 views

Replacing a RAID1 disk with a different model

When I replace a disk in a 2-disk RAID1 array, how do I know if a proposed replacement disk is actually suitable? Just to make the question more concrete, the disk to be replaced is a 1TB Seagate ...
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547 views

Btrfs RAID1 SSD + non-SSD

My laptop has two disks, a SSD and a traditional magnetic disk. I plan to make a partition on the mag disk equal in size the SSD and set up BTRFS RAID1. This I know how to do. The only reason I'm ...
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99 views

Recover data from server with “broken disk” Raid1

One of the drives (sdc) on the server hosted on hetzner has gone broken and I cannot mount the drives to backup the data, following is the df, fdisk, mdstat, examine outputs All i want to do is ...
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260 views

Hard disk error in Intel Matrix Storage Manager

I have two hard disks, both 160GB, and with Intel Matrix Raid on these two disks, I created two volumes Volumne0 Raid1 Volumne1 Raid0 Now, one of the hard disk shows error in the Intel Matrix Raid ...
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1answer
278 views

How would hardware RAID compare to Windows software RAID?

I recently bought a new PC with a Gigabyte Z97P-D3 motherboard. One of the things it supports that my old machine didn't is RAID so I had planned to transfer my 2x 1TB hard drives from my old machine ...
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399 views

WD Green and Software RAID

On WD's website it says Desktop drives are not recommended for use in RAID environments, please consider using WD Red hard drives for desktop RAID environments or WD datacenter hard drives ...
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902 views

Converting Boot drive from RAID0 to RAID1

I bought a HTPC I plan on using as a NAS/HTPC combo, which has been working well for me for a while now. When I bought the machine from Dell, it came with 2 500GB HDDs in a RAID0 configuration as ...
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276 views

Firmware RAID drive assignment suddenly missing - How to add it back?

I have an ASUS Sabretooth 990fx R2.0 motherboard, and I have three HDD's in total. 2 x 250GB Samsung EVO SSD drives and a single WD 1TB HDD. I had set up my 2 SSD drives in RAID-1 configuration ...
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126 views

Re-merging two disk that used to mirror each other

I have had two hard disks that mirrored each other (RAID 1, software based). After I recently plugged them out of the mother board and plugged them back in, this mirrored volume was unavailable. I ...
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Expand RAID 1 size from 500GB to 4TB in Linux

I currently have an FTP server that has approximately 500GB of space on it. I’m getting very close to reaching the limit of this (97%) and purchased two 4TB drives to replace the old drives. From ...
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252 views

RAID1 has not handled disk failure

I have a Dell Vostro running Windows 7 with 2 x 1TB hard drives in a Raid1 array. It uses Intel Rapid Storage Technology (IRST) to manage the Raid1 array. This is how I purchased the machine. Last ...
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1answer
668 views

Deleting RAID 1 array with OS on it and switching to AHCI mode? Without losing data?

I am trying to break my RAID 1 array (using onboard intel raid controller) that has Windows 8.1 installed on it. I then want to switch my bios to AHCI mode and boot from one of those drives. Is it as ...
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1answer
653 views

Beginner Backing up ZFS Storage Pools

I'm considering moving my personal home data to ZFS on a Debian PC to take advantage of ZFS features such as data integrity and checksums, deduplication, and snapshots. The box has to be more than ...
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384 views

Mounting HFS+ (hfsplus) RAID 1 under Linux 3.13

I'm using a Linux Mint liveCD to rescue data off a Hackintosh which had its boot drive fail. I also have an HFS+ RAID 1 (created with Disk Utility in OS X) on separate drives in the system. ...
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1answer
245 views

How to link a linux system to an existing RAID1 on 2 external hard drives?

I installed Debian Linux (Wheezy) on a small HDD, added two identical large (2TB) HDDs, and built a RAID1 (without using lvm), using mdadm. I have stored a large quantity of files on the RAID. I run ...
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35 views

Bootable RAID1 instead of extra SATA drive

Here's the deal as a web developer I am total rookie in the hardware stuff, but since we make more money now and tried to experiment some stuff. I got this Raid1 (4 SAS Drives) and extra 3TB Sata ...
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1answer
2k 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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689 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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145 views

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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1answer
55 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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314 views

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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92 views

P8P67LE Motherboard - SATA MODE RAID; Create RAID 1

As it seems my ASUS P8P67LE motherboard has built-in RAID capability. My OS is previously installed in normal mode and in BIOS setting SATA MODE is set to AHCI (Advance host controller interface) ...
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127 views

RAID 1 scalability [closed]

Assuming I'm in a home environment and I want to keep my data secure, how would I build an expandable custom NAS? I can't afford a real SATA/SAS controller. I'm thinking of a scalable array of RAID 1 ...
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1answer
156 views

Usability of solid state drives after long term storage without without power

So, I was recently hired on to a company that has shipped out several 24/7 always on servers with solid state drives. I understand that SSD longevity has been improved upon, however to my knowledge ...
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118 views

Multiple disk controller cards and RAID1

I'm creating a btrfs RAID1 array, and I have two SATA3 controllers - one on the motherboard and another in a PCIe slot. For simplicty's sake, let's say I only have two drivers, sda and sdb. Would I ...
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RAID array failure. False positive?

Background: I have 3 storage units in my PC: an SSD that contains my operating systems a 1TB hard-drive that is about 5 - 6 years old a 1TB hard-drive that is only a few months old The 2 big ...
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45 views

Best RAID Solution for dual boot?

I've seen this topic talked about before on this site but with other users using 2 drives for the active partition (booting from the same HDD thats got RAID) however my situation is a bit different. ...
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91 views

Data loss warning rebuilding RAID1 logical drive

I have a Windows 7 Pro server running RAID1 and from the log, it appears that it 'lost' a drive for a few seconds and now thinks that the RAID1 has failed. I assume it needs rebuilding, which I ...
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Server has Crashed, How to Recover My Data from Raid-1 Configured HDDs?

I was using HP ProLiant ML150 G6 with Windows Server 2008 as File Server. Server is configured with 4x250 GB RAID-1. All of a sudden electricity fluctuates and the server got crashed. Now it turns on, ...
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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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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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398 views

RAID 1 without cache protection - ZMCP/backup battery

I'm running RAID 1 on an Adaptec 6405. I'm trying to decide if I need to install the ZMCP on the card to provide Cache protection. Adaptec's ZMCP is the equivalent of a BBU - battery backup for the ...
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1answer
2k views

Understanding /proc/mdstat [U_] VS [_U]

My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 (...
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1answer
4k views

How do I recover data from only a single drive in RAID 1 setup on Synology DS214+ NAS?

I'm doing this so I know how to recover my data in case the NAS itself dies out and I'm only left with just a single drive from the 2nd bay (or from the 1st bay). Setup Synology DS214+ NAS 2x 4TB ...
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1answer
211 views

btrfs does not show drive as missing

I am trying out btrfs and I noticed some funny behaviour: I have two drives in a raid 1 configuration. sudo btrfs fi show Label: none uuid: 52b9c6f6-ce5c-4727-861e-e2fd012e475f Total devices 2 ...
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561 views

Is Btrfs vulnerable to RAID write hole effect?

If not, does it mean that Btrfs in RAID mode is fully resistant to power failure?
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457 views

RAID1 drive failed; partition missing after reboot

I think I shot myself in the foot here, but let me quickly divulge what's happened: Intel Matrix Storage Manager started reporting that one of the two disks I had in a RAID1 array configuration had ...
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1answer
753 views

How to create a software RAID-1 array on Windows 7 not spanning whole disks

I have a brand new PC dual booting out of a single SSD drive (win7+debian). I added a couple of 2T hd I want to use from both Win & Linux. My target is to have two separate RAID-1 arrays on four ...
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1answer
373 views

How to limit bandwidth (file sync) to a specific windows file share (smb - raid1 backup device)?

So I decided that I needed a Raid1 backup device for the home. Mostly to backup documents and media. There will be about 3-4 Windows systems in the household that would sync files to this device. I ...
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2answers
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re-add to RAID1 is not possible

On Kubuntu 13.10 I have two hdd: sdb 1TB with two partitions - one in RAID1 and second is simple. Second hdd sda 500GB is whole in RAID1. Once I unpluged second hdd, put there some other hdd instead,...
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337 views

Repair partition table for disks in a RAID1 array

Here's my problem. I have several arrays. RAID1. I've scanned each drive that's part of an array with gdisk and it reports problems. One array (2 drives) has a damaged GPT partition table and a ...
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What are the risks of running a software RAID 1 array in degraded mode?

I'm replacing my workstation's system drive and would like to in the future be able to easily add a second drive to form a proper (although software) RAID 1 mirror. For the time being, however, I'm ...
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Super slow SDD write speeds with RAID 1

I have a very new computer system, configured in RAID 1, but was surprised that the write speeds were extremely slow! Here is a snapshot of my computer setup: Motherboard: Asus Z9PE-D8 WS ...
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145 views

Intel RST accidentally selected wrong drive as system drive — how to fix?

Question / TL;DR If Intel RST has marked a drive other than my RAID set as the system drive, how can I get it so that the RAID set is now seen as the system drive, and catch it up to my drive now? ...
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219 views

Debian/3ware 9500 - RAID Failure?

I swapped the hard disks from my home server into a new case last night (new mobo/CPU/RAM) and transferred its 3ware 9500 PCI-X SATA RAID card with it. The machine has 4 disks configured in 2 RAID1s - ...
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Have two partitions in RAID1

The answers are unclear wherever I look. I have two 2TB drives for a RAID1 and I want to mirror them while having two partitions on the drives. One partition will be 100GB and contain programs, the ...
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81 views

Is linux LVM a good choice for 2 disks ? [closed]

I am installing ubuntu server 13.04 on a machine. I have 2 devices (hard disks) on it: 2 x 500GB on RAID 1 1 x 1TB I was thinking about setup LVM, but I have no idea about how it works or if it's ...
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RAID1 w/Intel RST — can I replace failed drive with bigger drive?

The Setup I have 2 x 1TB drives in a RAID1 configuration. One of the hard drives has failed and so my RAID situation is degraded. All data is backed up via Backblaze as well so I'm not worried about ...