RAID 1 is the official name for mirrored disks or volumes

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RAID 1 - Speed with diferent speed disks

I was wondering... I have a RAID 1 with an SDD and a HDD disk. Of course, the Write speed should be the same as the HDD disk. But the read speed? The SDD disk is called more times than de HDD? Or ...
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RAID1 Partitioning Scheme for a Linux Server

I'm having trouble setting up a RAID1 for my server where both drives are bootable. What I'm doing now is /biosboot and /boot partitions on both drives, then I have my LVM volume group with logical ...
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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 ...
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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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Adaptec 1220SA RAID 1 degraded - should I try to rebuild?

I've got an old Windows 8.1 PC with an old RAID 1 array and a very low-end Adaptec 1220SA RAID controller. Adaptec Storage Manager (screenshot #1 below) shows one drive failed, the other OK. There's ...
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How to Know the Progress of RAID1 Rebuild on Windows?

I have just installed Windows 10 on my RAID1 array which has 2 disks. And I'm now doing some tests. I unplugged one disk and booted into the OS, then replugged it back, and restarted. Now I see the ...
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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 ...
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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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1answer
655 views

SSD TRIM support on RAID-1 array through Intel RST

I'm making the jump from HDDs to SSDs on my home desktop, and I'd like to retain a basic level of redundancy (RAID-1) like what I have with my HDDs. Right now, I'm using Intel's RAID controller on my ...
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2 HDDs a constantly going out of sync in “safe” (RAID-1) mode

I have rather old LaCie 2Big model. I purchased it approximately 3 - 4 years ago equipped with 2 1 TB HDDs. Recently one of them got out of order and I decided to install 2 2 TB HDDs. Now I run into ...
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Linux mdadm does not assemble array, but recreation of array does it

Maybe i'm not very clear in the title. When i'm trying to assemble my raid1 array with mdadm: sudo mdadm --assemble /dev/md0 /dev/sdc /dev/sdd It tells me that mdadm: Cannot assemble mbr metadata ...
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1answer
25 views

What happens with my pc with RAID 1 just after a single hdd failure?

I just was wondering what would happen immediately after a hdd failure occurs in a hardware raid 1 array? Will the pc continue to work with only one hdd?
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Getting Event when RAID1 is failed

I have set up RAID1 using windows software RAID in windows 7. Is there anything registered in event viewer when RAID is failed?
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1answer
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managing zfs + mirroring

I've noticed that guides on zfs+redundancy+performance tend to emphasise mirroring as a good option, but zfs administration information tends to provide relatively little information on managing a ...
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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 ...
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47 views

SED shadow master boot record and linux md raid 1

I'm contemplating this setup: Two SSDs with SED (self encrypting drive), in a software raid mirror, linux (or grub?) to unlock the two disks with one pwd from the Shadow Master Boot Record I ...
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Use software RAID 1 drive as main disk and boot drive in windows 7?

Can I boot from a software RAID 1 (mirroring) drive in windows 7? Windows 7 would not let me install to a software RAID volume so I installed to the first disk and then added the second disk ...
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Directory based virtual RAID1

The problem: I have video files for a project that require editing. Those files are larger than usual, therefore disk speed became an important obstacle during my work. The Idea: I know I could ...
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Intel Raid1 \ “Fakeraid” Shows up as 2 Logical Drives in Windows server 2008 r2

As the title says. I have successfully raided 2x <250 gb drives in Bios as C:\ without any problem. However when i try to Raid the two WD RED 3TB they "show up correctly" in my bios and inside ...
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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 ( http://www.seagate.com/ww/v/index.jsp?name=st2000dl003-bcuda-green-sata-6gb-2tb-hd&...
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Does rsyncing a Linux boot disk require any caveats to run off the copy?

The new server to run CentOS7 is on order. It will have a 60 GB SSD for CentOS 7 and four internal hard drives. The internal hard drives will run in a software RAID1 for three disk mirroring plus the ...
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Two systems freezing up: probably a RAID/MB sata controller failure?

I have two systems with approximately the same age with similar trouble: First system: ASUS P8h67-m-le mother r3 version i7 2600 (3,4ghz) 8gb ram ddr 3 (2x4gb dual channel) RAID 1 via ...
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Does NASware 3.0 benefit a software RAID1 running Linux?

WD Red drives comes with NASware 3.0 (or older ones NASware 2.0). In running a CentOS Linux server in RAID1, does NASware offer any benefit? Or is NASware a Microsoft server thing?
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Migrate from Windows 7 single HDD system to new system with RAID 1

I have a Windows 7 system with a single drive. It is regularly backed up to a system image on a USB drive. I'm building a new system with two drives that are bigger than the old system's drive. I ...
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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 ...
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810 views

Large File Copy Freeze, Hardware Setup

My computer is home built with the following components: BIOSTAR A780G M2+ SE AM2+/AM2 AMD 780G Micro ATX AMD Motherboard AMD 64 X2 6000 Kingston HyperX 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (...
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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
102 views

RAMDisk + SSD = Raid 1? Boot OSX

Is it possible to create RAID 1 with RAMDisk and SSD in OSX? Something like: Boot Mac, OSX-Partition will be loaded from SSD in RAMDisk. Boot to RAMDisk and use it like any other system-drive. ...
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Multiple HDDs hanging constantly

I have an AMD Windows 7 system which has its OS on an SSD, and until previously had a single 4TB HDD as a data drive. I never had an issue with that drive until I installed a second 4TB drive and put ...
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How to replace drive in RAID1 with SAS 6 Util without losing existing data?

The machine in question is an older Dell Precision T7400 which had 2 1TB drives configured as RAID1. When a problem was suspected with a drive, I entered the BIOS-level config utility (v6.14.10.10) ...
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Is a RAID1 (mirror) with 2 x 4TB drives and ZFS (through freenas) okay?

I'm looking to create a freenas RAID1 using two 4TB drives. It's going to be my primary location for a generic backup location (use rsnapshot for local files and keeping computer dd'd images) and I'...
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29 views

Raid 0 with mixed drives

I have following 7 physical drives When trying to create RAID0 It shows the total capacity as 237.2 instead of 365.2 So is there any RAID configuration where I can have a single volume spanning ...
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1answer
24 views

MDADM two disks of different ages from same array

I have an mdadm mirror. One of the drives was failing, and through not concentrating, the a new drive was mirrored against the failing drive, which had been out of the array for a while, so is a ...
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755 views

Raid recovery in gigabyte GA-8I945 Pro

This was a working machine until a few days ago. Now it won't boot into the OS, during startup it makes clicking sounds (I think from one of the drives). Installed OS: Windows 2003 Web edition ...
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946 views

Raid-1 Western Digital Green AARS, cloning and WD Align Utility

My current setup runs on top of 2x Western Digital 2500KS drives on Raid-1, using the motherboard's 780G raid controller, on WinXP. Everything is fine, but the drives are a bit noisy. I am ...
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Rebuilding a raid 1+0 (10) system

We have a set of 8 disks that are raided together with RAID 10. Our software that rebuilds RAIDS do not allow a RAID 10 but does have a RAID 1 or a RAID 0. In theory, we wanted to drop the mirrored ...
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7k views

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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Trying to mount Western digital mybook duo raid 2 disks but fails

I connect both my linux system. I do a bash-4.2# mdadm --assemble --scan mdadm: /dev/md/MyBookLiveDuo:2 has been started with 2 drives. then i try mount /dev/ ash-4.2# mount /dev/md/MyBookLiveDuo:2 /...
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Which copy will be used when RAID1 loses a piece of data? [duplicate]

The case of complete drive failure is pretty clear for RAID1: the faulty drive simply does not work and data is being read from the good one. Now the other real situation: the drive works, but some ...
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btrfs RAID-1 size

I have a btrfs raid1 filesystem with a couple of disks 1TB 2TB 2TB 2TB 5TB which should result in a total of a 6TB RAID-1 array. The result of the http://carfax.org.uk/btrfs-usage/ Total space ...
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Win 7 won't recognize 850 Evo single disk with HDDs in RAID1

This has managed to drive me nuts: I used to have 1 SATA HDD as a single drive for OS's and 2 SATA HDDs set-up as RAID1 using the onboard AMD controller for storage, everything was fine. I bought this ...
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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 ...
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Is it possible to create RAID1 and JBOD with 2 hard drives?

I have a 2-Bay Synology NAS enclosure and ideally I want to achieve the following setup, unfortunately the GUI doesn't allows me. So my question is Is it possible to create the following setup? And if ...
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285 views

How do you increase harddrive space on an Intel hardware RAID 1 with larger disks?

I have an old RAID 1 volume from about 7 years ago. A while ago I replaced one out of two drives with a drive with 4x the size and then recently I replaced the second two out of two disks. Both of the ...
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Unable to tell if RAID 1 (or any RAID) is active

I recently installed Windows 10 on a new computer build, but wanted to install it with RAID. I haven't done RAID before, but I set it up in my BIOS. But once I do this, now it says that both drives ...
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106 views

Replacement drive for Lacie Network Space Max Raid 1

I have a faulty drive in my Lacie Network Space Max (Samsung HD103SI 1TB) I have to install a replacement, but the original drive type seems to be out of production. Can i replace it with this one? ...
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To know hard disk failing in RAID 1

I have set up RAID 1 in windows 7 using disk management console. But I don't know if one hard disk is failed. I would like to get alert or message when one hard disk is failed in RAID 1. How can I do ...
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282 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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changing RAID hard disks

There are four hard disks in my machine. I installed window 7 in disk 1. I set up RAID 1 in disk 2 and 3 in disk management console. It is working well. But I would like to change RAID hard disk. I ...
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3 mirrored volumne in window 7

Can I make 3 mirrored Hard disk in window 7? I would like to use backup system(mirrored volume) with RAID 1 in window7. But the problem is that I can make two volume mirrored. Is that possible?