RAID 1 is the official name for mirrored disks or volumes

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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 ...
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603 views

Super slow SDD write speeds with RAID 1

I have a very new computer system, configured in RAID 1, but was surprised that the write speeds were extremely slow! Here is a snapshot of my computer setup: Motherboard: Asus Z9PE-D8 WS ...
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681 views

Cloning Ubuntu mdadm RAID1

I would like to clone a pair of RAID1 drives created with mdadm. I've tried Clonezilla, but there's no native support for mdadm, so it resorts to using dd which is incredibly slow. I've looked for ...
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36 views

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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28 views

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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560 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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99 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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358 views

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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57 views

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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385 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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88 views

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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263 views

Server has Crashed, How to Recover My Data from Raid-1 Configured HDDs?

I was using HP ProLiant ML150 G6 with Windows Server 2008 as File Server. Server is configured with 4x250 GB RAID-1. All of a sudden electricity fluctuates and the server got crashed. Now it turns on, ...
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814 views

md0 RAID1 can't read superblock

i have a problem with my md0 array, which is an raid1 (2 mirrored USB-Sticks) Mount gives "Can't read superblock" cat /proc/mdstat: Personalities : unused devices: <none> fdisk -l ...
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189 views

Is `dmsetup remove` safe with respect to contained data?

I have a "lost" SW RAID array as described in this question: http://askubuntu.com/questions/311024/raid1-array-lost-after-upgrade-from-ubuntu-11-10-to-13-04. I have now identified a way to mount one ...
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336 views

Upon reboot, Linux software raid fails to include one device of a RAID1 array

One of my four Linux software raid arrays drops one of its two devices when I reboot my system. The other three arrays work fine. I am running RAID1 on kernel version 2.6.32-5-amd64 (Debian Squeeze). ...
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277 views

Cannot read NAS drives formatted for Linux

I have two hard drives (mirrored) in a QNAP TS-209 Pro II NAS box that won't mount properly. They are formatted for Linux (EXT3 file system) and the problem appears to be with the NAS, not the drives ...
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2k views

How to create a mirror (raid-1) of an already setup and running ubuntu 12.04 system?

I have a fully setup ubuntu 12.04 installed on a single drive and formatting it just to setup raid-1 is not an option Unlike other answers like this one: Ubuntu 12.04 - Add RAID 1 Array on existing ...
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62 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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771 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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570 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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102 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 UUID=...
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355 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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1k 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 /): ...
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248 views

Will Thermaltake Muse R-Duo Raid reset lose data?

I have a Thermaltake Muse R-Duo Raid chassis with two drives installed and DIP switches set to Raid-1. However, only the left lights are lighting up and I have data on the drive. I'm guessing it is ...
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187 views

Linux + convert RAID0 to RAID1 on Blade Server HS21

I have HS21 blade server My blade server configured as RAID0 – one disk ( disk with red-hat Linux OS ) My target is to configure the blade server to RAID1 – mirror with 2 disks ( I need to add second ...
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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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11 views

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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10 views

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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56 views

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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10 views

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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97 views

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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49 views

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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39 views

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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10 views

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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20 views

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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19 views

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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24 views

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?
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28 views

Raid 1 upgrade path?

I have a 3ware 7950-4i RAID controller configured as the boot drive for a Linux server running several virtual machines. It is populated with three 1 GB drives. u0 consists of p0 and p1 configured as ...
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44 views

recover data from single RAID 1 disk

I have a Lacie 2 Big NAS drive containing 2x1TB disks in RAID 1 mode. Since one of the disks was being reported to fail, I tried to backup the contents of the NAS to another external HDD. ...
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68 views

Software RAID 1 in centos 7

I created software raid 1 using Two 1 TB hard disk in centos 7 using standard partition. I did this for fault tolerance feature in RAID 1 But, here when 1 hard disk failed the server goes into ...
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21 views

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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25 views

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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261 views

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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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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252 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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91 views

Data loss warning rebuilding RAID1 logical drive

I have a Windows 7 Pro server running RAID1 and from the log, it appears that it 'lost' a drive for a few seconds and now thinks that the RAID1 has failed. I assume it needs rebuilding, which I ...
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321 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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940 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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908 views

dmraid -r" just returns No RAID disks

I have installed centOS 5 on our HP Proliant ML110 GH6 server and configured the Smart Array through BIOS Now, i would like to set up an e-mail notification with the RAID status (especially if it's ...
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749 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 ...