RAID 1 is the official name for mirrored disks or volumes

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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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1answer
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. ...
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3answers
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How to set up 2 RAID 1 HDDs? [closed]

I have a home-server (or I want to set one up) with one SSD as system disk and two HDD's for the data. Now the HDD's are new so they don't have any partition. What would be the best way to partiton it ...
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1answer
143 views

Add new partition under raid-1 array

I have small /tmp partition, and I want to create new partition with size 10 GB than current one, I have two hard disk on raid-1 array # mdadm --query --detail /dev/md0 /dev/md0: Version : ...
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57 views

Software RAID 1 resync's on SATA cable switch?

I made a mistake when I opened up my desktop removed a 2 disk RAID 1 and reconnected them, but with the SATA cables switched, such that sda became sdb and viceversa. On boot, the RAID array started ...
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How to create a Software RAID1 in Windows 7 Home Premium? [duplicate]

Possible Duplicate: Which software raid modes does each version of Windows 7 support? Using the built in DISKPART program, or Disk Management, or anything else native to Windows 7, is there ...
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1answer
31 views

Hard drive raid compadibility

Given that I have a RAID 1 array of two 2TB hard disks 3Gb/s @ 5400rpm could one of the drives be switched out for a 2TB 6Gb/s @ 7200 rpm? How do you know if two drives will be compatible in a RAID ...
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4answers
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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 ...
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0answers
579 views

Data recovery from a single RAID1 disk

I extracted the disk from a Mybook World 2 (White Led). The device has only this 1TB SATA disk, and it is using RAID1. Yes, it is bizzarre, but WD enabled RAID even for a 1-disk configurations. This ...
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299 views

Data recovery from a RAID1 disk

I extracted the disk from a Mybook World 2 (White Led). The device has only this 1TB SATA disk, and it seems it is using RAID1 This is a report from disktype: francesco@blackhole:~$ sudo disktype ...
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3answers
309 views

Does Firmware RAID negatively affect non-RAID devices?

I am running Windows 8 on a Z77 Chipset mobo, and it's all running swimmingly, but I want to put my documents/music/etc. on two HHDs running under RAID 1. On my motherboard I have four SATA 3GB/s ...
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1answer
707 views

SSD lifetime in software RAID 1 [closed]

We're looking at use two SSD in a software RAID 1 raid on CentOS. We have tested performances and it is the same as a SSD alone. But we fear that because of mdadm, lifetime of the SSD will shorten. ...
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1answer
1k views

Software RAID 1 broken, how do I fix this?

I'm running CentOS 6 x86_64. There is a software RAID 1 being used on the two internal 80GB drives. I got the following e-mail sent to me: A DegradedArray event had been detected on md device ...
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0answers
469 views

How to move a software RAID 1 to a new pair of larger drives?

I'm running CentOS 6 on a server that has two 80 GB internal drives, in a software RAID 1. I want to replace this two internal drives with 750 GB internal drives I have available. How do I do this ...
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0answers
101 views

How to add new partition to RAID-1 array on Redhat FC10?

I have a RH FC10 system with RAID 1 partitions, here is mdadm.conf: # mdadm.conf written out by anaconda DEVICE partitions MAILADDR root ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90 ...
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2answers
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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 ...
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1answer
774 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, ...
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1answer
75 views

Is it okay to mix HDD models of the same size and manufacturer in a home server RAID 1 array?

I've got a WD Caviar Green drive I'd like to put in a hardware RAID 1 array for a home server (for storing music, photos, etc). Problem is, the specific model I have isn't shipping any more. Will I be ...
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2answers
11k 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 ...
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1answer
795 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 ...
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1answer
230 views

Booting Ubuntu with a RAID-1 Boot Failure

I'm planning on picking up 2 SSD cards for my file server and installing Ubuntu on them using softRAID-1. I will not be keeping a hot spare, so I want to make sure that, if one drive fails, I can ...
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2answers
420 views

FakeRAID array is failing, why?

We have a Windows XP system with an AMD mainboard (GA-890GPA-UD3H) and we are using the onboard RAID capability. The system is configured in RAID 1 (using the tool AMD RAIDXpert). It consists of two ...
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1answer
184 views

Hardware RAID 1 With ERC/TLER/CCTL

I am aware of the problem when using standard consumer-grade drives with RAID levels 5 and 6; if a drive takes too long trying to read and/or repair a bad sector, it will be dropped by a hardware RAID ...
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2answers
318 views

My existing external RAID 1 will not show on my new motherboard

I had two identical (external) WD 1Tb HDD that I set up in RAID 1 NOT through BIOS. I forgot how I did it (just followed some instructions online how to do it through Disk Management). But the RAID ...
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336 views

Windows 7 : soft RAID1 and dynamic volumes reliability

My setup is quite classic nowadays : 1 SSD for system/apps and 2 HDDs for data setup in a fake RAID1 array. I also have a backup scheduled every week for the data drive in case it fails because I ...
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3answers
1k views

Recovering data from RAID1 drive

I have recently received one of the two 1TB drives I had on a dedicated server. The drives were mirrored and the server was running CentOS 5.6. I've installed it in an USB enclosure and tried ...
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1answer
361 views

How to check consistency of an external RAID1 array in Windows?

I have a Western Digital MyBook Studio II configured into RAID1 (2×1TB) and connected to a Windows 7 machine via USB 2.0. RAID is done through a controller in the enclosure - I've never seen each of ...
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1answer
1k views

Is Intel Rapid Storage Necessary for a RAID 0 on a P6T-SE?

My question is indeed quite simple but I didn't find a clear definite answer by the usual method (aka Google), so I turn to this great community I have an asus P6T-SE motherboard which includes an ...
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1answer
1k views

RAID 1 Mirror Error with Two Western Digital 500GB Drives

I have Windows 7 Ultimate 64 bit installed on a Western Digital 500GB drive (WD5000BEVT-22ZAT0) that was partitioned automatically by Windows as 100MB System Reserved and 465.66GB drive C. There is ...
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3answers
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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 ...
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1answer
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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 ...
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1answer
211 views

Raid-0 (2xSSD) + Raid-1 (1xHDD) possible?

Is it possible to have the following setup? 2 x SSD (2x128gb) in RAID-0 (for performance) + 1 x HDD (1x500gb but using 128gb) in RAID-1 (for redudancy) If so, does the HDD mirror give a decrease ...
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1answer
457 views

How to convert existing disk to raid1 in debian

I have 1Tb drive with LVM on it. Now I've installed another 1Tb hard drive. And I want to make RAID1 without losing data on the first disk. Is there any way to do that without backing up data and then ...
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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 ...
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2answers
582 views

What triggers a RAID 1 mirror rebuild on a Lacie 2 Big USB3?

I have a RAID 1 mirror on a Lacie 2 Big USB3. When I break the mirror by pulling out one drive, keep making changes on the remaining drive and finally put the first one back in, the drives stay ...
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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 ...
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2answers
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How to set up software RAID 1 on Ubuntu 12.04?

My primary partition is sdb. I add new disk (sda) and formatted it as shown below: fdisk -l Disk /dev/sdb: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488397168 ...
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Ubuntu 12.04 - Add RAID 1 Array on existing device?

I read How can I add a RAID 1 array in Ubuntu 10.04 and Installing Raid 1 on Existing Ubuntu Server. However, I only have the following 2 hard drives: dev/sdb1 where Ubuntu 12.04 is currently ...
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1answer
246 views

Ubuntu - inconsistent performance with software raid-1

I'm installing a new system using soft-raid 1 with two physical disks. While running a few tests (after waiting for the initial sync to complete) I found the harddrive speed was highly inconsistent. ...
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2answers
1k views

How do I break a failed software RAID1(mirror) in Windows 7 without wiping data on the mirror HDD?

In Windows 7 I have created a software RAID1 array that has failed(failed redundancy) due to some weak sectors on one of the HDDs. I want to be able to reactivate the mirror HDD as a separate ...
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2answers
535 views

“error: no such device” at boot in Ubuntu Server 11.10 with Raid1

I have a configuration of 4 HDD's as RAID1 2 pairs of 2 HDD's. The first RAID1 pair is for the system, so I just made an 40GB space for swap, and the rest of it for the root. The second pair of ...
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0answers
831 views

Windows 7 won't boot from raid-1 disks until secondary non-bootable disks are removed

I have an ASUS X58 motherboard with a Intel ICH10R southbridge raid controller. Bootable raid-1 SATA disks are on channels 4, 5. Secondary raid-1 SATA disks are on channels 0,1. Everything was ...
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1answer
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RAID 1 - What happens if I disconnect both disks?

I'm trying to install windows on a new SSD, and I'm having problems getting it to work correctly. I've read that it's good to disconnect all other drives and do a format and clean install. Only ...
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1answer
415 views

How to move a windows machine properly from RAID 1 to raid 10?

Goal I would like to add two more hard drives to my current RAID 1 setup and create a RAID 0 setup on top of the two RAID 1 setups (which I believe is referred to as "RAID 10"). Components Involved ...
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4answers
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Restore data from a single RAID1 disk

I have one half of a RAID 1 array (from a LaCie 2big Network NAS), from which I'm trying to recover the data. I've connected the disk to my desktop PC (Ubuntu 11.04) using a Sitecom SATA/USB adapter, ...
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1answer
3k views

Can I pull one HDD from RAID1 and still use 2-bay QNAP NAS?

I have a QNAP TS-239 Pro II+ with 2 x 2 TB HDDs in RAID1. I'm running 3.6.0 Build0210 firmware. I access the NAS from my iMac (OS X 10.7.x). The NAS HDDs are formatted as ext4. I'm sitting at about ...
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1answer
1k views

Windows 7 mirrored volume fails during testing of fail-over mode

I have two hard-drives mirrored (i.e. RAID-1)to be my D: volume (non-boot drive) in Windows 7. Click to enlarge. This is the first time I have tried mirroring in Windows 7, but I've had (sometimes ...
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mdadm: hot remove failed

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
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2answers
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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 ...
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1answer
1k 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 ...