RAID 1 is the official name for mirrored disks or volumes

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Windows Server 2012 Software RAID 1 with dynamic disks; mirror two drives to one larger [migrated]

Lets say I have 3 SSDs: 1.) 120 GB, 1 Partition 2.) 128 GB, 1 Partition 3.) 250 GB, Mirror Is it possible to mirror both the partition from SSD 1 and SSD 2 to the large third SSD? Such that the ...
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Unable to access newly created software RAID array in Ubuntu Desktop

please assist me with the following problem. I already have an Ubuntu Desktop 12.04 box into which I have added 2 500GB drives in the hopes of wring them up in a RAID-1 configuration for simple ...
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Windows Software RAID 1 - How can I “Offline” both disks at the same time?

I want to disable both drives in my Mirrored Volume setup so that I can mount them in a virtual machine (for testing, no important data is on the drives right now). Offlining them individually breaks ...
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re-assemble a raid1 system

Wed Jul 1 14:41:33 EDT 2015 /dev/sda is 1.5 T drive. /dev/sdb was 1.5 T drive running raid 1 I am having issues with /dev/sdb powered machine off and intalled new 2.0 T drive in place of /dev/sdb ...
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No extents were found for the plex, when setting up Soft RAID 1 with RAID 5 on Windows Server 2012

I did find a similar question on this, but it did not really answer my question or fix the problem, so i'm starting up a new questions on it. This is my setup now: You can see if i have RAID 5 ...
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Ubuntu RAID1 with HP server

I have a server HP ProLiant ML310e Gen8V2 with 2 disks, and I want to install ubuntu 12.04 with RAID1. However, I have read some posts that say "This model of HP didn't support RAID1 with Ubuntu or ...
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chunk, ext4 stride and strip-width size for RAID level 1?

the man page for mdadm says: "[chunk] is only meaningful for RAID0, RAID4, RAID5, RAID6, and RAID10." i.e. it does not apply for raid1. even if you pass the value, it will say "ignoring chunk size" ...
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Create Degraded RAID 1 in Windows 7

Question is simple. Can one create a degraded RAID 1 in Windows 7? In other words specific to a hypothetical situation, can I have a backup drive with backup data on it, then buy a second backup ...
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27 views

Keep linux software RAID 1 after OS change

Currently I've configured software RAID 1 on ubuntu machine. However I am planning to add SSD drive just for the OS and keep my main 2 HDD for the storage with RAID. The question is, can I put now ...
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174 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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USB Hardware Raid 1 useless with vendor lock-in? [closed]

Context: I'm looking for a USB hardware RAID 1 box. Every device I evaluated suffer the vendor lock-in issue and I was not able to connect a single disk to an other system to get the data without any ...
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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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Can't create LVM raid in Pidora

I'm experimenting with Pidora, trying to configure some reasonably redundant storage. [root@bravo ~]# lvcreate -d -v -m1 -L10G -n ${lv_name} ${vg_name} Executing: /usr/sbin/modprobe dm-raid ...
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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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How do I tell which OSX Raid partition needs fixing (and fix it)?

Investigating why my OSX Software RAID disks weren't all being used I discover my RAID-1 system (4 x 1.5TB in two mirrored 3TB slices) is running in degraded mode: airhead:kitematic sholden$ sudo ...
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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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40 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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2answers
172 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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54 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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143 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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121 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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125 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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266 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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188 views

Reboot causes DegradedArray event on Raspberry Pi

I tried to setup a RAID1 with two external SATA drives connected over USB to my Raspberry Pi (Model B+ running Raspbian Wheezy). The disks are both new Western Digital WD20EZRX drives with 2TB ...
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154 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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49 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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285 views

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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92 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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405 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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255 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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186 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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121 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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Can BIOSasissted RAID1 (with OS Linux) be rebuilded with a external HDD with windows?

I have created a RAID 1 BIOS assisted,booted from RAID 1 and installed Linux OS on it.I had a power outage and the RAID1 status now is Rebuild. My question is : can i rebuild this RAID1 with Intel ...
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33 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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859 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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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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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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With a the built-in Windows software-RAID1 mirror, what procedure does Windows follow on an unreadable sector?

For modern retail hard drives, the Unrecoverable Read Error (URE) is around 1x10E14 bits. This translates into one bad sector for every 12 terabytes of data read. For enterprise class hard drives, its ...
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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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50 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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how to use Intel RAID 1 on windows 7 boot drive

I have a motherboard with Intel RAID. and 2 new and empty 1T HDD. I want to use 2 HDD as RAID 1 (Mirror) to install Windows 7 pro (C: drive). What is the best or correct way to do it? I have ...
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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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How to read data from a Raid 1 drive

I have a Sharecenter NAS with two hard drives in it setup in a Raid 1. One of the drives has failed (making noise) and somehow so has the Sharecenter. I have a SATA-USB thing but my Win8 machine ...
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68 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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80 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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143 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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72 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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38 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. ...