RAID stands for Redundant Array of Independent Disks, and is a technology which can provide increased reliability, performance, and/or redundancy by utilizing multiple hard drives simultaneously. RAID can be implemented in a computer via either a hardware or software controller.

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I want to delete a Raid 1+0 stripe array

Currently I have a raid card running two drives in an RAID 1+0 stripe. I want to know can I remove the raid card and have the computer operate on one drive. Without having to reload Windows. I suspect ...
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370 views

XFS: Mount overrides sunit and swidth options

I have a 9TB XFS partition consisting of four 3TB disks in a RAID-5 array with a chunk size of 256KB, using MDADM. When I created the partition, the optimal stripe unit and width values (64 and 192 ...
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217 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?
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610 views

Why URE fails raid rebuild and “renders RAID 5 unusable” [closed]

I'm sorry but I just can't comprehend from a theoretical point of view. Why is it that running into a single URE, the raid controller decides everything else are ruined and just dies? Stupid. A 40 TB ...
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2k views

WIndows server 2012 will not allow mirroring drives/partitions

I have a dell c1100 server and it gave me a hard time installing windows server 2012. Now installed, I want to setup mirroring inside windows (raid 1 effectively). In disk management, I right click ...
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117 views

How can I change super-minor number of a software raid array meta 1.2?

I had a double failure while I was away on the holidays of my array. As I was saving the data, I created a new array on a new drive has /dev/md1 and copied the info from my almost failed remaing HD ...
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14 views

I've 2 disk in StripedVolume (W7/64b) but sees two dynamic disks

I work with 2 disks, 1 TB in striped volume with W7/64b, for a total size of 1.8 TB. After a corruption of the OS, I've re-installed same W7/64b (with the 2 dynamic disks not connected), and after ...
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329 views

Booting Windows 8 off of a 4TB RAID0 drive?

Well, I have a problem and I have been working on fixing it for the past few days, but I am at a loss. So, I am trying to setup a 4TB RAID0 drive and have Windows 8 boot off of it. I know that a GPT ...
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29 views

Is it possible to operate two RAID-0s alternately?

I have a software RAID-0 (two hdds) on a WIN7 machine that holds all footage of a video project. If I remove and store these drives and install two new drives as RAID-0 for another project, will I be ...
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225 views

RAID1 drive failed; partition missing after reboot

I think I shot myself in the foot here, but let me quickly divulge what's happened: Intel Matrix Storage Manager started reporting that one of the two disks I had in a RAID1 array configuration had ...
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127 views

Dell Poweredge SC1435 Hard-Disk Failover…what is that?

I don't think this server has raid...or does it? In the bios you have an option for Hard Disk Failover...what does that do? Is that raid 1? Does anyone have any ideas on this one? There is no raid ...
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527 views

How to create a software RAID-1 array on Windows 7 not spanning whole disks

I have a brand new PC dual booting out of a single SSD drive (win7+debian). I added a couple of 2T hd I want to use from both Win & Linux. My target is to have two separate RAID-1 arrays on four ...
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97 views

RAID 1+0 on Windows 7 Professional after installation

I have an old PC running Windows 7 Professional unformatted since 2008 on a GA-Z77X-UD3H motherboard presently which according to the instructions has support for RAID 1+0. Unfortunately I haven't ...
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203 views

Consistent RAID 1 or equivalent solution across Windows, OS X, and Linux?

I just built a new computer containing a 256 GB SSD and two 1 TB Seagate hard drives. I'm trying to find a good solution for having the two 1 TB drives mirrored, and keeping this mirroring working ...
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88 views

What happens to a RAID 0 array if some of the constituent drives are unavailable?

If I have three drives in a RAID 0 array containing a file system, and I happen to disconnect two of the drives, then what would I see on the only connected drive? Would I see nothing? Would I get an ...
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205 views

mdadm: faulty Array, how to get recover as much as possible?

I have a RAID5 with 4 Disks in my PC. All of them were healthy (and the RAID itself) until before. I tried to install windows 8.1 which automatically creates this "SystemReserved"-Partition. The ...
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230 views

Would an Intel raid configuration benefit from Intel Smart Response feature?

My hard drive took a dive so I looking at getting some new drives. I was thinking of getting 3 WD Black Edition 1TB disks. My motherboard has the Intel Matrix Storage feature and I was going to hook ...
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1k views

Windows Dynamic Disks vs BIOS FakeRAID

I have two 3TB disks in a Windows 7 Dynamic Disk Mirror array (effectively, software RAID1). Apart from being tied to the O/S (I can't mount the array in Linux, for example) - is there any difference ...
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71 views

Dell Studio Slim 540s JBOD RAID

I'm working on a Dell Studio 540s that has dual 750GB drives in what appears to be a JBOD configuration. The computer reports "Missing operating system" at boot. The BIOS appeared to have been ...
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104 views

Alternative to RAID 10

With 6 drives in RAID 10 one will get 3 drives effective storage and 3 redundant drives, so in a best case scenario up to 3 drives can fail without loosing any data. But in a worst case scenario (now ...
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256 views

re-add to RAID1 is not possible

On Kubuntu 13.10 I have two hdd: sdb 1TB with two partitions - one in RAID1 and second is simple. Second hdd sda 500GB is whole in RAID1. Once I unpluged second hdd, put there some other hdd ...
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49 views

Safest, most flexible storage for multiple HDD's

I am building a NAS/fileserver based around the HP Proliant N54L Microserver. It is going to be used as a central repo for all media (movies, serials, music etc), possibly a dedicated torrent seedbox ...
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1k views

ESXi doesn't see hard drive(s)

Initially I tried to setup ESXi on RAID1, but it didn't see any Remote or Local hard drives during installation to choose from. Then I deleted the RAID1 configuration and removed one of the two hard ...
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157 views

Migrating raid array between different controllers

Recently my motherboard unexpectedly gave out, there are two disks attached in RAID 0. The controller in question for this motherboard is a ICH9R. Due to the sparse availability of hardware I am ...
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1k views

Can a failed Btrfs drive in RAID-1 be replaced live?

I am trying to decide on a filesystem and would like to know if it is possible to replace a failed drive in btrfs RAID without downtime. Suppose I create a new btrfs filesystem using the command ...
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87 views

Using external (RAID) HDD for new operation system

I have a question about using a RAID HDD setup on a laptop. My laptop is very nice (intel i7 Haswell, 20 GB 1600 MHz, 3 GB dedicated GPU) but my HDD are slow (2x1TB 5400 RPM) and even worse - they ...
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39 views

Setting up desktop RAID on some drives, but not all

I have a Windows 7 desktop with five SATA drives. I would like to make four of the drives into a RAID 5, but leave one (the OS drive) as is. From the reading I've done, I've found these options, but ...
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148 views

Why are consumer grade RAID controlers MORE expensive than complete external array solutions and are they compatible?

I'm looking at consumer grade ESATA DAS solutions for my home lab. I use vmware workstation with mucho VMs currently all stored on the same 1TB 7200 RPM SATA disc- performance is pretty terrible as ...
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19 views

How does RAID perform in the context of virtualization/private cloud

Imagine a scenario: you've got one machine, several drives (SSDs, of course). You want to have several virtual machines in that machine. These machines might be: An active directory node A SQL ...
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417 views

If I have “badblocks” write its output to a file, and that file is empty, does that mean that no bad blocks were found?

I recently ran badblocks on a large server hard drive to check for possible issues (SMART reported that everything was fine, but I needed to be sure). The command I used was: badblocks -c 1024 -b ...
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56 views

Can a failed disk in a RAID array be replaced by a disk with fewer total logical blocks?

Can a failed disk in a RAID array be replaced by a disk with slightly fewer total logical blocks? Specifically, Dell PERC 6 RAID controller; RAID5; Hitachi HUS153014VLS300 with 287140277 blocks; ...
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Intel RAID within the motherboard persistence information

I was wondering: where the Intel RAID (fakeraid) controller available on many mainstream motherboard persist the raid information? On the disks or in some solid memory on the motherboard? EDIT BTW I ...
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1k views

How can I achieve maximum sustained sequential disk write performance?

I need data write rates of ~1 GB/sec sustained for ~1 hour. Data is coming in over this PCIe x4 frame grabber. I need to stream its full bandwidth to disk. I don't have experience with RAID, but as ...
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151 views

Why is BIOS switching from IDE to RAID mode?

Acer Aspire M3203. BIOS will randomly default HDD interface to RAID mode and fail to boot Windows 7, claiming there is no RAID array defined and, subsequently, "no boot device." If I go into BIOS and ...
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124 views

How do I mark a disk as OK (Asus/Intel Software RAID)

I have an Asus P8Z77V_PRO mobo using Intel RAID (Windows 7 x64). A drive has an error, but after examining it with SMART tools, I'm satisfied the drive is fine. Unfortunately, I can't figure out how ...
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74 views

linux mdadm: recover overridden array

I had 2 3TB disks in a RAID1 array as /dev/md2. I tried to recover that array, by recreating it (which was probably stupid). I issued mdadm --create /dev/md2 --assume-clean --raid-devices=2 ...
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202 views

How to determine cause for failing RAID arrays

I have to investigate a recent increase in failing RAID-1 (Mirror) arrays we're encountering in our installed PC park (10K+ PC's). The problem is twofold: one part of being a pilot phase we started ...
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20 views

How to identify and recover RAID on 2 drives?

I have 2 drives from my older PC. They are a RAID setup, but I don't remember which type. One of the drives shows up in Windows as having a partition table, but the partitions themselves are not ...
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3k views

Can a RAID 1 be created without losing data?

Since my HDD possibly might give out soon and I don't want to have to go through the process of setting everything up again, I was thinking of getting a secondary HDD to mirror my data onto with a ...
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591 views

Adding third disk as a single disk in a server with an existing RAID1

I've got a ProLiant DL360 G5 server (Fedora 13) with two SAS disks in a hardware RAID 1, working fine. Now I hot plugged another SAS disk. I'd like to configure this new hard disk out of my RAID, as a ...
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198 views

Repair Windows software RAID 1

I have a Windows software RAID 1 array that has apparently broken without my knowledge (thanks, Windows!). How can I regain control of it? The way I see it, I have two options: Break the Array - ...
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1answer
60 views

Moving existing RAIDed drives to new DataTale enclosure

I have 4 2TB hard drives from a Mac Pro that were RAID 5'ed. I sold the Mac Pro but kept the hard drives. I just bought a DataTale 4-bay RAID enclosure that supports RAID 5 ...
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1answer
80 views

Intel RST accidentally selected wrong drive as system drive — how to fix?

Question / TL;DR If Intel RST has marked a drive other than my RAID set as the system drive, how can I get it so that the RAID set is now seen as the system drive, and catch it up to my drive now? ...
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1k views

RAID 0 partitioning for Linux installation

I have recently bought ASUS Zenbook UX32VD with 128Gb SSD, which seems to be RAID-0 made from two 64Gb SSD drives. It has Windows 8 preinstalled. I want to install Arch Linux on it, while keeping ...
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530 views

RAID degraded, partitions missing

We're having a very weird issue at work. Our Ubuntu server has 6 drives, set up with RAID1 as follows: /dev/md0, consisting of: /dev/sda1 /dev/sdb1 /dev/md1, consisting of: /dev/sda2 /dev/sdb2 ...
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783 views

FreeNAS planning - RAID controllers & expanding volumes

I'm considering building a FreeNAS box to replace a Synology DS1511 - mainly because I'd like it as a project with more flexibility. Couple questions: 1. Most people recommend a hardware RAID ...
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233 views

Test RAID array read write speeds from boot disk

I have a VMware ESXi server with a local RAID 5 datastore formatted with VMFS. The RAID controller is a DELL PERC H710 hardware controller and the server is an R620. I get abysmal write speeds, ...
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134 views

Raid5 reconstruction is extremely slow

Three days ago added another drive to my RAID5 array with 3 drives, each drive is 4TB. Since then than only 42% has been completed MegaCli64 -LDRecon ShowProg L0 -a0 ...
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921 views

How to enlarge RAID5 array with MegaRAID WebBIOS?

I'm a little confused with RAID5. I created a RAID5 array group from WebBIOS with 6 drives. Then created an XFS partition on this RAID5 drive. How can I enlarge the RAID5 without losing data? In ...
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421 views

WD MBWE II (White Strip Light) 2TB - unable to access data

I have a WD MBWE II (White Strip Light) 2TB - (WD20000H2NC-00) Was working fine until a few days ago. I guess there was a power failure and after that I am unable to access the 'Public' or the ...