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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RAID5 vs RAID4 purpose of floating parity

I still did not get why is RAID5 better than RAID4. I understand both computes parity bits that are used for recovering if some failure occurs, the only difference is in storing those parity bits. I ...
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20 views

How to determine which drive in a firmware RAID is failing

I have two drives in an Intel ICH10 RAID 1. They are not enterprise-level drives; just regular WD Caviar Black drives. Recently, reading/writing to the mirrored volume has become extremely slow and ...
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34 views

How can I restore RAID 0 on my DELL laptop?

I have been formating my dell laptop for quite a while, I bought it back in 2012, with one year warranty, it ended last august, but I think since the moment I formatted it to windows 8.1 I probably ...
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15 views

HP ProLiant ML350e Gen8 - Ubuntu 14.04 LTS [on hold]

I was researching about new Ubuntu Server 14.04 LTS and the Proliant ML350e Gen8 with B120i RAID controller and I found that HP certified Ubuntu without RAID engine on 12.04 server version, but now I ...
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8 views

gdisk doesn't recognize RAID0 disk as size of whole array?

I put in two Samsung 840s at 256GB and RAID-ed them together and installed Windows 8. I'm having trouble using gdisk to get ready to install Linux. gdisk sees the array, /dev/sda0, as a whole ...
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9 views

setting up a Linux based cluster [on hold]

I would like to set up a cluster that has the ability to compute in parallel. (Think Hadoop using AND simulating a CentOS or Ubuntu server). I would like to get the traditional experience of setting ...
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17 views

How does performance scale in a single column 2-way mirrored storage space as more disks are added?

In Windows 8.1 Storage Spaces, there seems to be pretty solid evidence that 2-way mirrored storage spaces have performance that improves significantly as more disks are added to the pool as long as ...
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13 views

linux - centos won't boot after rebuilding raid

I have a dedicated server with OVH. Yesterday they had to replace one of the HDD because it was about to fail. After replacing the disk, we had to rebuild the RAID and now the server won't boot ...
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27 views

Is it possible to build RAID0 or RAID1 using 2 disk when one disk is not cleen?

I'm using win 7.Is it possible to build RAID0 or RAID1 using 2 disk when one is not cleen? I have 2 same hdd disks, one of them cleen and one with data. I want to build RAID0 or RAID1 (on the fly) ...
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22 views

MDADM RAID 5 disk missing after reboot

I have a server with 6 disks (4x2TB + 2x4TB). I put the 2TB disks in 2 RAID 0 and the resulting 2 4TB RAIDs with the 2 4TB disks in a RAID 5 array. The RAID works fine until I reboot the server. After ...
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19 views

Fedora 20 stopped booting after migrating to RAID array

I have decided to migrate my working Fedora 20 installation onto RAID-1 software array. After this operation, I have a problem with booting my system. Background My machine is MacBook Pro (Early ...
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25 views

Do single bit errors during raid 5 rebuild currpt the entire array?

Does a single bit error during a raid 5 rebuild break the entire array? if so, why? If a single block of data was corrupted/misread during the rebuild, would that not simply result in one block of ...
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14 views

Reset Windows Server password [duplicate]

I'm trying to reset a password for local administrator for a server running 2008 R2 in raid. I tried using spotmau(doesn't see operating system at all), hiren's boot cd(sees administrator, made ...
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1answer
20 views

CentOS Gnome only showing 1TB on 6TB Server?

I just bought a new server and want to use it to store files, It has 2x 3TB hard drives. I Set them up in raid 0 as i don't need any redundancy. I don't know much about servers and command-lines ive ...
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27 views

Dell Precision T3500 Intel Rapid Storange Technology shows no Acceleration option?

I have a Dell Precision T3500 with a 2TB HDD with my OS installed and a brand new 128GB SSD which is not formatted. The SATA mode is set to RAID in BIOS and the latest version of the Intel Rapid ...
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1answer
31 views

Is there a chance to lose data if I switch RAID to AHCI

I have Windows 7. The boot drive is NON-raid SSD. I also have 2xHDD RAID1 (just data). RAID is Intel Matrix (or whatever the latest name for it). I installed Windows in RAID mode What might happen ...
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3answers
66 views

Is hardware RAID worth it? [closed]

I am planning to build a home NAS server, and have managed to get my hands on the following- Core i3 3220 Ivy Bridge CPU 4 GB Kingston RAM Basic motherboard with dual gigabit LAN port 4x WD 3TB HDDS ...
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10 views

Is it possible to change a Dual SATA RAID enclosure to a NON-RAID enclosure?

just wanna know if it possible to change a Dual SATA RAID enclosure with a normal USB2.0/3.0 enclosure, like change it to single HDD drive. will it have any problem like cannot detect on PC? Cos I ...
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3answers
1k views

Detecting when a server is running on UPS battery

I have a home server (HP Proliant ML310 G4) that I bought from my employer a month or so ago. The server runs Debian Linux and I use it for just about everything. I can get away with doing this ...
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1answer
26 views

Booting EFI disks in BIOS system

I have a Debian-based system with three drives in it. All three drives have the following partition layout: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 4001GB Sector size (logical/physical): ...
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20 views

Synology DS1010+ shows degraded under status

As the title says I've got an error on my friend's NAS this evening. Even when I check that disk, it said that it's "abnormal" under smart test but the status shows "Not initialized". Under the ...
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31 views

Calculate MTTDL

i have problem, how to calculate MTTDL for array RAID 10. I need it to understand for test. So if you could help me, I'll be happy :) . I have 4x4TB discs in RAID 10. Average data transfer rate = ...
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8 views

What is “2LUN” mode in connection with RAID?

I've came across RAID products that also list JBOD (just a bunch of disks) mode and 2LUN mode. What the heck is 2LUN mode? I could not find a description; the closest thing seems to be LUN but I ...
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30 views

Why do you lose a drive when configuring RAID 5?

RAID 5 requires a minimum of three disks in order to work. Say each disk is 2 TB, and you have four disks, for a total of 8 TB. In RAID 5, your total capacity drops to 6 TB. Why? If the "spare disk" ...
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60 views

Very slow volume expand on Synology ds2413+

I've posted this elsewhere on the internet aswell, and will obviously reply in both places if a proper solution is found. I am attempting to expand SHR volumne (2x4TB, 1x2TB) with additional 4TB ...
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32 views

How to configure raid on Gigabyte GA-970A-UD3

I am trying to setup RAID 0 in the BIOS of my motherboard: Gigabyte GA-970A-UD3. I have enabled RAID in the BIOS SATA mode, and I get the option to hit Ctrl+F to enter RAID option ROM utility. When I ...
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1answer
22 views

Do i need a motherboard that supports raid to use a raid controller?

I want to setup a raid 0 to run windows on. Because windows will not run on a dynamic disk, I want to use a pci express raid controller to be able to install the os on it... But i have a few ...
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21 views

Why is windows server 2008 resyncing new raid 5 array?

I have setup a software raid 5 in windows server 2008 standard, immediatly after creating it now says resyncing. What is it resyncing when there is no data on the volume? Is it safe to write data to ...
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1answer
27 views

RAID1 for storage only without reinstalling Windows

I have a Z87-A motherboard. My main (Windows/Program) drive is Samsung Evo 840 256GB SSD and my storage drive is a 2TB Seagate Barracuda HDD (ST2000DM001). I bought another one of the Seagate HDDs for ...
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How to enable Samsung EVO 840 mSATA SSD Self Encrypting Drive with Intel RST RAID 0

I have an MSI GT60-2OD (Haswell MB, UEFI enabled w/o CSM) with 3 Samsung EVO 840 mSATA SSD drives in RAID 0 mode (Intel RST AHCI RAID Controller Miniport aka Intel(R) Mobile Express Chipset SATA RAID ...
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11 views

How to set up parity for spanned volumes

I am looking for a way to make parity backups of my data that i store on a large spaned volume... Ideally i would use raid 5, but i have drives of many different sizes, and would like to use all. What ...
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17 views

Skip initial resync on a new Windows software RAID 5 build?

I just added 8x4TB and created a software RAID5 volume. Server 2008R2. Based on progress so far, it's going to take 8 days to complete the resync. I'm not a busy man, but that's asking a lot. ...
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1answer
18 views

Setting up a RAID 5 Array

I am currently trying to convert my drives from just a bunch of external disks, each one individually shared from my (CentOS) server into a RAID array (ideally, RAID 5). At current, my drives are: ...
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8 views

Ubuntu boot through failed RAID

I have a large media partition as a separate RAID5 on my Ubuntu server. The server is not easily accessible, so I need it to continue the boot process in all but the most dire circumstances. Right ...
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45 views

Intel Rapid Storage Technology RAID Setup always shows on system startup

Is there a way of getting the Press <CTRL - I> screen to not show on startup? Or is it permanently there as long as I have RAID?
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24 views

Raid 5 for more than one failing disk [closed]

RAID 5 works the following: Disk1 | Disk2 | Disk3 A | B | A xor B A xor B is called the parity and it can be on a different disk for different blocks. Now, whenever one disk fails, one can ...
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35 views

How to configure RAID 1 on Intel Rapid Storage, and partitioning design

I would like guidance on setting up a RAID 1 system from BIOS with Intel Rapid Storage. System details: I have Click BIOS II running on a MSI motherboard (Z77A-G43). I also have 2 x 2TB hard drives. ...
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19 views

SAS and SATA together in a RAID

I have to build a new server with SAS drives for RAID 10. However, I have 2TBs of storage on 2x1TB SATA drives. Would it be possible to still plugin 2 SATA drives even if I run a hardware raid 10 ...
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26 views

Hybrid Raid-1 HDD + SSD — Write Intent Bitmap

I am currently running a laptop with 1 HDD and 1SSD. I currently am using mdadm to put some partitions in a raid 1 configuration with --perfer-write set on the HDD. I have this working correctly ...
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2answers
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How to replace hard drive in RAID 5 Array and keep data intact?

How would I go about replacing a defective hard drive in a RAID 5 array while keeping the data intact? I have a Highpoint Rocketraid 2720SGL RAID card.
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29 views

Protect HDD File access from Live CD

How can we protect our files from copying through another PC or Live CD (Physical Security)? Is it possible to use RAID and secure our data? My os is Linux. Can recover Raid FS from other OS?
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37 views

New Install, Win 8.1 Access over 2 TB

new install, Z87 pro MB, Win 8.1 64 bit, UEFI based. I have 2 TB drives, configured in a RAID 1+0 config, so end result is approx 4TB useable, and windows shows this. The problem is that while I can ...
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9 views

Power on/off MD-Raid disks on command

I recently set up a mdadm ext4 RAID 1 array for storing my pictures. I don't need to access them very frequently (maybe once ever week or two), so I was looking to poweroff my drives when I'm not ...
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24 views

How do I accelerate more than one hard drive using Intel Rapid Storage Technology

I have a Biostar T77B, a 3570K, a Seagate 3TB 7200 RPM HDD, and an OCZ Agility 3 60GB SSD as the core of my system. I just bought a second Seagate 3TB 7200 RPM drive and a Kensington SSDNow V300 60GB ...
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84 views

Cheaper alternative to ZFS Storage for a home NAS

I'm looking to build a NAS for home use with 8-10*(2-4TB) drives, out of which 2-3 drives would be used for parity via software RAID. In the past years and up to date, ZFS seems to have become the ...
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30 views

Linux raid questions: How to boot if one drive fails?

I am setting up a linux server with two drives in an mdadm created raid 1. All the online help I fine says to create your partitions and then create an md0 raid volume using something like sda1 and ...
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38 views

Understanding /proc/mdstat [U_] VS [_U]

My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 ...
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19 views

Is there a safe way to move a partition beneath a linux software RAID5 using mdadm?

Suppose, for example, that you have a RAID5 across multiple disks and you would like to retire the oldest of the disks and replace it with something from this decade. I know I can fail the partition ...
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F17 dracut boot fail error, RAID array involved

I have problem booting up my colleague's desktop machine. The problem is that, on boot the machine throwing the following error. dracut Warning: Unable to process initqueue dracut Warning: ...
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Is there a way to show RAID details in a similar way to MDADM?

I find mdadm --detail <device> very useful when I need to know what is going on with the device (/proc/mdadm too). Example: /dev/md0: Version : 1.2 Creation Time : Mon Mar 4 ...