RAID 1 is the official name for mirrored disks or volumes

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19
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8answers
22k views

Simple mdadm RAID 1 not activating spare

I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin. The command sudo mdadm --detail /dev/md0 used to ...
17
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2answers
6k views

combining SSD and hard disk in software RAID1?

Does it make sense to build a Linux software RAID-1 (mirroring) using an SSD and a normal hard disk? I want to combine the advantages of SSD (fast transfer rates, fast access times) with the ...
14
votes
2answers
11k views

Does software RAID 1 in Windows 7 improve read speeds?

Does software RAID 1 (mirroring) in Windows 7 improve read speeds? I'd like to set up RAID 1 to help protect my important documents (yes, yes, I know it's not a backup), but performance is also ...
11
votes
11answers
56k views

What's the difference between RAID 1 software mirroring and Fake RAID?

I've just ordered two new hard drives for my main desktop and a copy of Windows 7 Professional 64-bit. I'd like to do a clean install of Windows 7 onto the new drives (leaving my old Windows XP ...
8
votes
5answers
51k views

How to install RAID drivers on already installed Windows 7?

64-bit Windows 7 Ultimate 6GB RAM Intel i7 920 Intel X25-M SSD 80GB 2,5" Club 3D Radeon HD5750 GA-EX58-UD4P Motherboard I've been running fine with Windows 7 installed on the SSD. I wanted to ...
7
votes
3answers
5k views

What advantages and disadvantages have Hybrid SSD/HDD RAIDs

I just read about Hybrid RAID arrays consisting of SSDs and common HDDs which are supported by Adaptec's RAID controllers. Does such a RAID configuration provide real advantage? Isn't write ...
7
votes
4answers
23k views

Can a mirrored (RAID-1) disk be plugged into another system to be read?

If I have disks in a RAID-1 array, can I take one of them out and plug it into a different system to be read? This means, on the target system, treating the disk from the RAID array just like an ...
6
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3answers
4k views

Practical RAID Performance?

I've always thought the following to be a general rule of thumb for RAID: RAID 0: Best performance for READ and WRITE from stripping, greatest risk RAID 1: Redundant, decent for READ (I believe it ...
6
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3answers
4k views

In Ubuntu, how to get email notifications about (software) RAID problems?

I know getting email notifications should be possible, and perhaps even enabled by default... But how to make sure alerts are properly configured, and if, for any reason, they arent't, how to set them ...
6
votes
3answers
7k views

Can I take my ReadyNAS drive in Raid1 and plug it straight into new different machine?

I would assume that I can just take my HDD out of my NAS (in raid1 mirror) and plug it into another enclosure and have it work off the bat but I'd like to make sure... Any ideas? Edit: My current ...
6
votes
1answer
2k views

A ZFS or LVM or MD redundant heterogeneous storage proposal

I have the same problem most people have: how to create a reliable personal storage solution with the fact that: Hard drives fail with alarming regularity. Losing files is unacceptable. I will buy ...
5
votes
4answers
5k views

Does RAID1 increase performance with Linux mdadm?

I have a cheap 2-bay NAS with a 2TB HDD. To be robust against disk failure, I'm thinking of buying a second 2TB HDD and putting it in RAID1 with Linux mdadm. The file system is ext4. Will this ...
5
votes
2answers
2k views

How does one enable --write-mostly with Linux RAID?

Unfortunately the mdadm and mdadm.conf man pages are not quite up to par. I would like to enable the --write-mostly flag for my RAID, but neither the man pages nor the internet will tell me how. I am ...
5
votes
5answers
1k views

RAID 1 not performing as expected

I recently bought a new 320Gb hard drive for my computer to set up RAID 1 on it for some added security. Installation went as smooth as could possibly be (plug in power, plug in data cable, start up ...
5
votes
2answers
299 views

Do newer Mobo's do RAID in a way that allows the disks to be viewed as a normal non-RAID HDD if transferred to another computer?

I built a new PC this weekend, and one of the joys I had was to transfer my RAID 1 array to the new system with a different mobo. The disks were not recognized at all, by either the mobo (no ...
4
votes
4answers
5k views

Does RAID 1 protect against corruption?

Does Raid 1 protect against data corruption? For example, let's say that I am keeping all of my important files on a NAS that uses 2 disks in a RAID 1. If one hard drive has some kind of internal ...
4
votes
2answers
906 views

Is RAID 1 on a home PC useful? [closed]

Is RAID 1 on a home PC useful?
4
votes
2answers
7k views

Can RAID 1 have more than two drives?

Recently I had a discussion with a teacher of mine. He was claiming that you could set up RAID 1 with five drives and that the data would be mirrored over all of these drives. I told him a RAID 1 ...
4
votes
4answers
9k 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 ...
4
votes
4answers
11k views

RAID vs AHCI on Windows7 x64 ASUS

I have an ASUS p5ke-wifi/ap which has built-in RAID controller. From the BIOS, I can choose between 3 controller types: IDE RAID AHCI In that order. This setting was set to AHCI when I installed ...
4
votes
2answers
86 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 ...
4
votes
1answer
5k views

What exactly does a RAID 1 resync do?

I just have a quick question about RAID 1 resyncs. When a RAID 1 array performs a resync is it actually copying all the data from one disk to another or is it just analyzing the data on the disks and ...
4
votes
1answer
676 views

SSD in RAID 1 Questions

I want use SSD drives in RAID 1 setup. Although performance is important, reliability comes first, so I'm going with Intel drives (either the 320 or 510 series). This will be installed in a Dell ...
4
votes
0answers
599 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 ...
4
votes
1answer
623 views

Is TRIM disabled even with Windows Soft RAID 1 (Windows Dynamic Disks)

I am looking to build a Windows 2008 Server and wanted to use a RAID SSD array, either via SATAIII or PCIe. Everything I've seen that RAID does not allow TRIM commands to be passed to the SSD, ...
4
votes
1answer
2k views

Is it possible to use software raid in Windows 7 on the boot partition?

I want to use RAID 1 on my workstation configuration at work, and I've been looking at using the build in mirror functionality in Windows 7. When you click on the add mirror option it presents you ...
3
votes
2answers
2k views

How does RAID 1 determine whether a disk is corrupted?

I've built a RAID 1 array of 2 disks, A and B. That means that every bit on A is equal to a bit on B. If one disk fails, I can safely retrieve my data from the other disk. But then I started ...
3
votes
2answers
10k views

Upgrading disks in a RAID1 Synology 2-bay drive

I have a Synology 2-bay 211j NAS with 2x1TB HDD installed as single RAID 1 volume. I'm running out of space, so I'd like to upgrade my NAS with 2x3TB HDDs. Is there any easy way to copy all data from ...
3
votes
3answers
2k views

RAID1 Setup - Are Empty/Blank/New hard drives a requirement

I need to setup RAID1 (software/hardware). I have a 1TB (no space left), can I buy a new 1TB and setup RAID1 successfully without a remote chance of loosing anything on the existing 1TB, as I got it ...
3
votes
3answers
645 views

RAID 0 + 1 with 3HDD 2x1TB + 1x2TB

Is it possible to make RAID 0 + 1 with 3 Hard Drives I have currently setup raid 0 with 2x~1TB HDD (1.8TB approx) Now i got 2TB HDD (1.9TB approx) which i want to be as a mirror drive. Is is ...
3
votes
1answer
1k views

Malfunctioning TS-239 Pro II+, how do I recover my data?

I'm in a real bind here. About a week ago I bought a QNAP TS-239 Pro II+ and transferred all my important data across to it. It's a 2 TB RAID 1 array, because I really don't want to lose this stuff. ...
3
votes
1answer
10k views

RAID 1 - “Add Mirror” greyed out

I am trying to RAID 1, two hard drives in Windows Server 2008. They are the exact same make and size. One has data on it the other is blank and formatted. They are both set as dynamic disks. ...
3
votes
1answer
749 views

Ubuntu 12.04 boot degraded RAID

I've installed Ubuntu 12.04.1 in a new server and set up the 4 hard drives with 3 RAID 1 devices, the configuration is such that the first two drives have md0 (swap space) and md1 (/) with the third ...
3
votes
1answer
194 views

RAID-1 causes far more noise than non-RAID?

After moving two 2 WD 1TB Black drives to a hardware RAID-1 system on my GA-Z87X-UD3H Gigabyte motherboard they started making a lot of noise and rattle. I've tested both of them separately in a ...
3
votes
1answer
246 views

I'm trying to mirror drives of the same model, but one appears to be slightly larger

I'm trying to mirror a drive using Disk Management in Windows Home Server 2011. The target drive (Disk 1) is the exact same model as the source drive (Disk 0), but the target drive appears to be 1MB ...
3
votes
1answer
2k views

Resize a RAID 1 volume on OS X Snow Leopard - how? (Note: software raid)

I've scoured the Internet in search of an answer to this question, and as usual with OSX-related topics, I often don't find any deep-dive technical explanations sufficient enough to feel confident ...
3
votes
0answers
200 views

Use Intel Rapid Storage Technology with a secondary PCIe RAID card

I have Intel's RST on motherboard using RAID1 (2x2TB) and a boot drive. Trying to add another RAID1 (2x3TB) has failed since RST is limited to 2.2TB for RAID1. Now I've bought another RAID card in ...
3
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0answers
2k views

Why does an Intel RST RAID 1 array write faster with write-back cache disabled?

I have two HDDs (5900 RPM) in RAID 1 (mirror). I know, I know, it's painfully slow. I'm currently in the process of replacing them with faster drives, hence this question while I'm testing things. ...
3
votes
1answer
11k views

How can I mount a single RAID 1 disk/partition as ext3?

I need to copy data from a single HD, which used to be part of a Linux RAID 1. I've googled around, but can't find any clue how to mount partitions from this single HD. Background: The HD comes from ...
2
votes
3answers
10k views

Motherboard RAID support or Hardware RAID controller?

About a year ago when I was researching how to set up some drives using RAID on a PC I was planning to build, everyone said I would need to purchase a hardware RAID controller, the decent one was ...
2
votes
2answers
762 views

In Wikipedia, it says RAID 1 has a space efficiency of 1/n. Can that be correct?

right now on Wikipedia, it says RAID 1 (Mirroring) has a space efficiency of 1/n, and Space efficiency is given as the amount of storage space available in an array of n disks, in multiples of ...
2
votes
3answers
2k views

RAID-1 - hardware or software?

I've been looking to set up a pair of RAID-1 (mirrored) drives for data archiving. My first reaction was to just go out and get an enclosure with 2 drive bays and a built-in RAID-1 controller. After a ...
2
votes
3answers
6k views

How to fix missing RAID1 drive

I had to do some fiddling about with my cables inside thebox and now I am getting a "Critical Error" about the RAID disks during startup. I have a gigabyte GA-MA770T-UD3 motherboard. Aparently the ...
2
votes
1answer
426 views

Can I mix a 15K drive with a SSD drive in a hardware RAID1?

I've got a hardware RAID1 of two Hitachi 15K drives here, forming the array with an Adaptec controller. Let's assume one disk dies and I'd like adopt SSDs. I would then replace the dead drive with a ...
2
votes
3answers
5k views

How do I create a complete disk mirror in Windows Server 2008?

I'm trying to mirror a full Disk in Windows Server 2008, however I don't see any options to mirror a full Disk, only Volumes. Both disks are the same brand, size and are configured as Dynamic Disks, ...
2
votes
3answers
6k views

How can I move RAID 1 hard drives from one enclosure to another or retrieve the data another way?

I have a Fantom G-Force Mega Disk MDN 1000 dual drive hard drive enclosure with two 500 MB hard drives setup in RAID 1 mirroring mode. Unfortunately, the enclosure/controller has failed, for the ...
2
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1answer
208 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?
2
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2answers
3k views

Are there any good software-based RAID 1 mirroring alternatives to Windows 7 Computer Management?

I only have Windows 7 Home Premium, not Professional, so the mirroring option isn't available in Computer Management. Are there any good alternatives? It's possible RAID 1 is overkill for what I'm ...
2
votes
2answers
696 views

Converting software RAID1 to hardware RAID1 without losing data

I have a home server running Ubuntu Jaunty and housing a 2 x 2TB RAID1 array. It is a software RAID but I'm looking to pull out those drives and put them in a external RAID enclosure to save space. My ...
2
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1answer
287 views

Recoverable RAID configuration for Windows 7

I'm getting Windows-7 in the next couple days to install on a home-built 2-disk system. The motherboard supports fake-raid, so I'll be setting up some RAID0 and RAID1 volumes. My hope is to make the ...