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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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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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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Raid 0 of 4 ssds with same size and the fifth HD as backup drive

I want to ask if it is possible if i have 4 SSDs (128GB each) with similar size to be raid 0 (to quadruple the reading and writing speed) and use another HD almost quadruple the size(500GB or do i ...
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Benchmarking RAID array with gnome-disk-utility

I want to run a quick benchmark to see if there is any performance advantage of my RAID 1 array. Array is the system disk, and while I can run benchmarks on each single disk, I can't find how to do it ...
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197 views

Ubuntu Server Install with RAID 5 on GPT partitions

Does anyone know of a good step-by-step tutorial for doing this. I've trying for ages to install Ubuntu Server with RAID 5 on GPT partitions, but even when it installs successfully, I am unable to ...
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43 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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636 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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97 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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755 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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55 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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37 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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123 views

Mac mini and USB3 5-bay RAID box issues

I run a entry level Mac mini (the 2012 model but bought recently) with OS X Mavericks and Server installed. I have connected a SSI 5-bay external USB3 RAID cabinet to the Mac mini with 5 750GB drives ...
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62 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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207 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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38 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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605 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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56 views

Recover Truecrypt-encrypted software-RAID5 (maybe overwritten superblock)

I updated some parts of my fileserver and installed the latest Debian version. It detected the mdadm raid, but marked the array as 3 active devices and 1 spare device. I thought this was wrong and I ...
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90 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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84 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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60 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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119 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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19 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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919 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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109 views

XEN Storage Repository (xe se-create) on Encrypted Raid 5 with LVM fails/resync

I am messing around with an ubuntu 13.04 installation. What I have: XEN Software Raid 5 LVM on top What I want: A storage repository for XEN as a logical volume The issue: "sr" does not work ...
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79 views

Configure raid in a HP SleekBook 14

I´m trying to reinstall in my machine Windows 8, i deleted in bios option the raid partition. But I want to reconfigure, I set the size of raid partition but it didn´t come bigger thant 60 gb. ...
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425 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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139 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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49 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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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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708 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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277 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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279 views

FreeNAS pool configuration - RAID1 + other drives

Simple questions, really. I found this answer with a similar setup, but not sure it answers my question. If it does, I'm curious why since the answer seems a bit unsure: ZFS Hard Drive Configuration ...
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485 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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RAID and rebulding

I have the following setup: Raid 5: 1 TB Drive 2 TB Drive 2 TB Drive 3 TB Drive Which give me a total of 3TB. I just set this up tonight and I was testing to see what happens when I ...
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146 views

NFS high CPU usage

Hello, I have a very strange issue. I have next server: Intel(R) Xeon(TM) MP CPU 3.16GHz cat /proc/cpuinfo | grep proce | wc -l 8 free -m total used free shared ...
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186 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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92 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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146 views

Intel Rapid Storage Technology service always crashes

I'm running Windows 7 x64 on a system based on an Asus Z87-Deluxe motherboard; the storage is configured for RAID mode; there is a single SSD drive for the O.S. and two 4-TB disks in a RAID 1 setup ...
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348 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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294 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 ...
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57 views

How can I get my SATA DVDs working again?

My hard drive crashed (WinXPpro), so I took a C drive from a broken PC. The new C drive is Win7pro. Motherboard is MSI K8N Neo4 Platinum, with 4 hard drives installed on SATA 1-4 (nForce4 Ultra); ...
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114 views

Troubleshooting major performance issue: Is culprit Intel RST, Hard drive, or something else?

The Setup I have the following components that come into play in this situation: ASUS P8Z68 V/PRO motherboard a RAID1 configuration (1x 1TB drive, 1 x 2TB drive -- I explain below), accelerated ...
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487 views

Faster SSD performance as cache drive or regular boot drive?

I have the choice of setting up a system: with two SSD Drives in RAID 1 mode as my boot drive for Windows 7 64-bit, with the Program Files and User folders moved to a second regular hard drive, also ...
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356 views

Ubuntu failed to detect MegaRaid lsi

Ubuntu(12.04) doesn't see HDS connected to MegaRaid. I have tried upgrading the framework, installed the driver, verified it was installed, rebooted the system and still don't see the drives connected ...
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790 views

Home ZFS based NAS…What processor/chipset to use? [closed]

So, I'm building a home/personal NAS. My plan is to expose both SMB fileshares for sharing files/media between hosts, but also to carve an iSCSI target LUN out of it for use by VMWare as a datastore. ...
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35 views

Three disk (possibly RAID) data recovery

I have on my desk three 160 GB disks that were once part of an HP Proliant Windows 2003 Server. They may have been part of a RAID configuration of some sort. They may or may not be damaged in some ...
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23 views

Non Raid - Symbolic links

I have 3x 3TB drives and 2x 1TB drives. I want to use all drives without RAID, but to be shown as a single volume. So that if a drive fails only the information on that failed drive will be lost. ...
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How do I import Outlook 2007 accounts and rules and IE usernames and stored passwords from old HD?

I had an older PC running Win7 and the motherboard died on me. I've since updated my PC to another Win7 machine running a RAID 0 along with my old HDD installed as an extra drive. The problem is, I ...