RAID 1 is the official name for mirrored disks or volumes

learn more… | top users | synonyms (1)

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
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 ...
2
votes
1answer
215 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 ...
0
votes
2answers
393 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 ...
1
vote
1answer
155 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 ...
1
vote
2answers
304 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 ...
1
vote
0answers
320 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 ...
1
vote
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 ...
0
votes
1answer
319 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 ...
0
votes
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 ...
1
vote
1answer
2k 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 ...
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 ...
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 ...
1
vote
1answer
201 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 ...
0
votes
1answer
430 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 ...
19
votes
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 ...
0
votes
0answers
468 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 ...
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 ...
2
votes
2answers
1k views

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 ...
1
vote
2answers
8k views

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 ...
0
votes
1answer
242 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. ...
0
votes
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 ...
0
votes
2answers
517 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 ...
0
votes
0answers
769 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 ...
0
votes
1answer
1k views

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 ...
1
vote
1answer
406 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 ...
2
votes
4answers
5k views

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, ...
0
votes
1answer
2k 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 ...
1
vote
1answer
998 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 ...
1
vote
0answers
949 views

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 /): ...
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 ...
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 ...
0
votes
1answer
127 views

How to identify raid1 disks

I would like to know how mdadm identifies physical disks of raid1 . I think it is managed by uuids not device file like /dev/sdc2 /dev/sdd2. But I can`t confirm such information of raid1.
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 ...
1
vote
3answers
141 views

What is the impact of using a Desktop edition disk in a RAID 1 setup?

I am setting up an onsite backup server in RAID 1 (soft) with low usage. I prefer quietness and reliability over performance: so I selected one of these "green" disk. Some NAS brand recommand these ...
0
votes
2answers
890 views

What are the theoretical performance differences between a single disk and a RAID-10 array?

Not taking hardware RAID cards into account, what kind of theoretical performance improvements should I see when using 4 disks in a RAID-10 array vs 1 disk by itself? For example, on RAID-0, I would ...
1
vote
2answers
205 views

Juggling HDDs and SSDs between home server and laptop

I just built a home server a few months ago with four 2tb drives for storage of media. It was booting from a 120gb Vertex3 SSD. That drive failed, now I'm realizing I don't need a SSD for the boot ...
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 ...
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 ...
1
vote
4answers
4k views

How do I mount a software RAID1 (mirror) created by windows in Linux using mdadm?

I'm switching my Windows server to Ubuntu and am trying to get my software RAID1 (mirror) that I created in Windows to show up in Ubuntu. I have read that this is possible here using mdadm, but I'm ...
1
vote
2answers
1k views

RAID1 External HD not working - shows up in Disk Utility but not usable. - MAC OSX 10.6.8 - What do I do?

I bought a dual bay enclosure from NewEgg I'm guessing 2 years ago to set up a RAID1. It's now a discontinued model but it is from Sans Digital. I put two Western Digital 1tb drives in it. It's been ...
2
votes
1answer
6k views

Install Linux mint with Raid

My MB supports fake raid (Intel DH67CL motherboard). But I was using the system in 'software raid' as I could not correctly set up fake raid in Debian. Now, I decide to use Linux Mint 12. During the ...
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, ...
0
votes
1answer
524 views

Windows will not load - Conflict between Windows repair and Raid 1 array/driver?

I have a friend whose computer hangs when it tries to load Windows XP. It has worked fine until a couple weeks ago. *Dell Dimension (don't have model number right now) *Pentium 4 *1 GB RAM *2 ...
1
vote
1answer
703 views

CentOS - mdadm raid1 drive won't mount to default location

I'm running CentOS 5.5, the system, boot, swap, etc. is all on /dev/sda and I have two identical single-partition drives /dev/sdb1 /dev/sdc1 that are configured in RAID1 (using mdadm). It was working ...
0
votes
1answer
839 views

How to remove swap partitions from RAID 1 Array on Ubuntu?

Can anyone point in the right direction on how to remove SWAP out of a RAID1 configuration on Ubuntu 10.04 server? According to the Ubuntu Advanced installation guide, here, it said to add swap to the ...
1
vote
2answers
1k views

Seagate Barracuda Green & Intel RST RAID 1 - slow drive wake up / clicking

I've got an interesting problem that I can't quite figure out. I'm using dual Seagate Barracuda Green 2TB drives ( ...
0
votes
1answer
249 views

Windows 7 Mirroring Drive Failure

I had a few questions when a drive fails that is setup with software RAID 1 in Windows 7, e.g. Dynamic disk mirroring: Will it still boot using the good drive (assuming boot drive is RAID 1), or ...
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 ...
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 ...