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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Does the RAID 5 parity drive have to be same size as the rest of the array?

In the most basic RAID 5 array, does the parity drive have to be the same size as the other 2 drives? Standard Array: 1x4TB Drive (Storage) 1x4TB Drive (Storage) 1x1TB Parity Drive Or will the size ...
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Is it possible to configure a multiplatter hard drive as separate drives?

I am looking to set up a RAID mass storage array, and have been reading about how large disk sizes are jeopardising rebuild because of the time required to execute a full rebuild and the chance of ...
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122 views

Delete RAID Array via PERC BIOS?

I have a an older PowerEdge 800 with a PERC 4/DC controller and RAID 1 array. Its running Windows Server 2008, and it serves as my file server (among a few other roles). I've swapped out all the ...
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Why does UEFI BIOS only identify a 2TB drive on a 25TB virtual drive?

I configure a RAID6 using 16 2TB disks, and finally get a 25TB virtual drive as shown in LSI MegaRAID BIOS. And then I boot via a USB stick and try to install 64bit Ubuntu 14.04 on it. At the ...
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38 views

software raid mirror verification

I am created the raid 1 mirror , I have made two partitions in in single hard drive they are sdc1 and sdc2, my question is how to verify that data is being written in both drives and how can I know ...
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426 views

Is it safe to stop a RAID 5 expansion?

I'm having some issues expanding a RAID 5 array on a Synology DS413. The drive has gone from 3 x 3TB WD Green drives to 4 x 3TB. I started an expansion operation and it's been stuck at about 60% and ...
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179 views

SSD RAID in Haswell NUC with Ubuntu: Does TRIM work?

I want a low-power, small, silent x86_64 Ubuntu computer with storage that's resilient against hardware failure of a drive. I'm thinking of buying D54250WYKH or D34010WYKH, one mSATA SSD and one 2.5" ...
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107 views

NAS - failed hard drive - unable to mount externally

I had two 2TB hard drives in my Dlink DNS-320 NAS, RAID 1 mirrored, working fine up unti. a few days ago, I heard some clicking from my NAS (which points to HD failure), and then I could no longer ...
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52 views

Can I reuse an overheated HDD after formatting in a ZFS RAID1?

I have a WD50EFRX which overheated according to SMART data (95 degrees celsius) and damaged some blocks (raw value of Raw Read Error Rate ~ 22000). There're no other values besides the Raw Read Error ...
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140 views

LaCie 2big, use existing disks (not formatted by the device)

About the LaCie 2big Quadra: I have 2 x 1T disks that have been formatted and used on Linux (not on LaCie). It happens that both disks have the exact same partitioning, while the content data is ...
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29 views

RAID: Switched from W2K12 Hyper-V to Ubuntu

Until yesterday I was using Windows Server 2012 Hyper-V. I had two RAID sets: one 600GB (2 disks) and one 3TB (2 disks). The first was connected to Windows Server. The second was passed through to an ...
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46 views

3ware RAID controller kicked out two drives from unit after replacing another degraded drive

One of our servers had a degraded drive and after replacing it, two other drives were shown as "NOT PRESENT" in the web interface. The whole RAID unit is now inoperable and I'm not sure how to re-add ...
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1answer
129 views

How to Create Virtual Block Devices

I want to create multiple virtual block devices like /dev/sda and then use them to create an md device for test purpose. I have mounted my root filesystem on /dev/sda1 and don't have extra space to ...
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120 views

Linux access to Windows 7 dynamic volumes (striped or mirrored)

I'm considering setting up a dual-boot system for the first time for many years. My plan for the system is to set it up as follows: SSD for both system partitions 2 identical hard disks, split ...
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1answer
95 views

Is it possible to use RAM in a RAID-1 configuration?

If I have two or more memory modules, can I get a system to use them in RAID-1 ("RAIM"?) as a poor-man's ECC?
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1answer
57 views

Is it possible to config RAID 1 ( RAID 0 (500GB + 500GB) + RAID 0 (1000GB) )?

We have a server with 2 500GB hard drives which are currently mirrored (RAID 1), but we're running out of space now. So, we have one more bay available, so my question is: if we buy 1 TB hard drive ...
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1answer
3k views

Shrink RAID by removing a disk?

I have a Synology NAS with 12 bays. Initially, we decided to allocate all 12 disks for a single RAID-6 volume, but now we would like to shrink the volume to use only 10 disks and assign two HDDs as ...
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59 views

Would software RAID 1 be broken if I move both drives to a new PC? [duplicate]

Does a RAID 1 setup by software (win) break once you move both drives to another Win PC? Is there any way to bind the drives together so that the RAID setup stays, even after changing motherboard/cpu? ...
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1answer
197 views

AMD RAID controller sees drives & RAID 1; Windows & RAIDXpert don't

I've got two SSDs I'm trying to work in RAID 1 on a Gigabyte GA-990FXA-UD5. Here is the weird combination of all the different variables with a fairly ideal testing scenario (plenty of spare ...
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50 views

How to setup RAID for data and AHCI for OS

I just bought 4 hard drives containing 4 TB each which I hope to set up in a RAID 10 setup, giving an apparent continuous 8 TB hard drive that is backed up. I also have a 256 GB SSD and a 1TB Hard ...
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621 views

Add 2 HDD connected via USB to Synology DS211j using Raid 1

I have a Synology DS211j and 2 old 2TB S-ATA HDD. What I plan to do is to buy two cases for these two hard disk drives that allow for connecting the hard disks to my Synology using the USB port. I ...
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907 views

4-bay NAS write performance RAID 5 + SSD vs RAID 10

I am planning on buying a new NAS (QNAP TS-453 Pro) for my Home Office. The NAS has 4 HDD bays and supports SSD Caching. Hence, I was wondering which setup would probably be faster in terms of write ...
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68 views

Is it possible to clone previous boot disk to new imsm raid array?

A PC with a hard drive 750GB. The hard drive has one partition with Vista and several partitions with Ubuntu 14.04. I mainly work with Ubuntu but occasionaly I boot Vista. Recently, the drive's smart ...
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61 views

Recovering software raid

I have a 3-disk software raid 5. Two disk appear to have failed at the same time; their number of Events is the same, while other third disk's is higher. I have copied all three disks into new ...
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34 views

Bootable RAID1 instead of extra SATA drive

Here's the deal as a web developer I am total rookie in the hardware stuff, but since we make more money now and tried to experiment some stuff. I got this Raid1 (4 SAS Drives) and extra 3TB Sata ...
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2answers
722 views

Seagate st3000dm001-9yn1 smart attribute [b8] [closed]

Seagate st3000dm001-9yn1 smart attribute [b8] The status of this smart attribute is showing: failed b8 Unknown Attribute 99 30 30 FAILED Where can I find more info about the 'unknown' [b8] ...
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1answer
187 views

Mirror / backup laptop btrfs drive to sometimes connected external USB disk

I have a laptop with an internal drive using Btrfs. There are several subvolumes and snapshots on here. I want a copy of this drive to be made periodically to an external USB disk of approximately the ...
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70 views

Can't boot from mirrored disk (software raid 1)

I make mirrored disk (software raid 1) on windows 7 and shut down my computer normally, but rebuild process not finished. And after that my computer can't start up, it hangs at "Verifying DMI pool ...
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120 views

Procedure for repairing degraded array with 3ware

I have a machine with a RAID-6 array made of 8 drives. The 3ware monitoring utility, tw_cli reports that one drive is degraded. So, I need to replace it. Online, I find these instructions on how to ...
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32 views

RAID 5 setup across SATA II/III

I have an ASUS P8Z77-V LK mobo with 4 SATA 3Gb/s and 2 SATA 6Gb/s. I'm considering purchasing 3 WD7500AZEX HDD's and putting them in a RAID 5 configuration. My question is, if I put the two ...
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46 views

Thunderbolt or USB 3 for a RAID? (drive speeds)

I am about to purchase a 4-disk enclosure to house a RAID10 volume. My question is, do I really need Thunderbolt, given that it's so much more expensive than USB3? This is my thinking, please let me ...
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Safe to blank MBR of a disk after adding it to an RAID1 array with mdadm?

I created a RAID1 array of two disks, /dev/sda and /dev/sdb, using mdadm. After several booting problems related to the BIOS and SATA/RAID controller of the board, I accidently created some new ...
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Which has faster read/write speeds an external hdd raid or external single ssd [closed]

I want to move data to an external hard drive AS FAST AS POSSIBLE and I was wondering whether it would be better to have 2 HDD (7200 rpm or higher 500GB each) in an enclosure running RAID 0 or a ...
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570 views

How do I resize software RAID partitions in GParted live?

I have a Linux RAID partition that I want to extend into empty space nondestructively. In GParted it has a lock symbol and right-clicking the partition brings up greyed out options. But on the GParted ...
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324 views

How do I fix my RAID array after NVIDIA GeForce Experience mangled it?

Alright, so I decided to try upgrading my graphics card driver today. I believe my previous version was 331.40 for my NVIDIA GeForce 580. I also have a GeForce 9800 for PhysX. So I started about an ...
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How can I re-establish my RAID5 Array (Intel Rapid Storage)?

I had a RAID 5 array, but two of the drives dropped from the array. (While troubleshooting another issue ASUS suggested I update my MoBo BIOS, but neglected to tell me this would corrupt my RAID ...
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1answer
302 views

How to recover RAID0 lost after a upgrade to Windows 8.1

How can I recover software RAID 0 after formatting my primary OS drive? I had the same issue as this post : I was previously running Windows 7 on a machine that had 4 physical drives and 1 SSD for ...
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117 views

Repair windows 7 software RAID

Sorry that some of this is vague, I wasn't onsite when it happened and am preparing to go in tomorrow and try to fix things. We had a Windows 7 PC that had 2 disks in a software RAID configuration. ...
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1answer
984 views

Boot partition for Software RAID 1

According to this tutorial: http://edoceo.com/howto/mdadm-raid1 as well as the answer to this question, ...it is necessary to create a separate boot partition if you want to boot from a software ...
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744 views

Cloning HDDs from a hardware RAID array?

Is it possible to clone the individual disks of a hardware RAID to get a copy of the contained array? I have an Adaptec RAID controller. I put it offline, attached the RAID member HDDs to a regular ...
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78 views

How to proceed after creating software RAID 1 array on Linux

So, I've created a RAID 1 array using two 500 GB hard drives. I used a Linux Mint Boot Disk, and then used mdadm to create the RAID 1 array using 2 hard drives, each which has a single primary ...
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420 views

Intel RAID verification and repair

Intel has a web page that describes how its Rapid Storage Technology verifies and repairs RAID volumes. For RAID 1 and RAID 10, it does the following: Data on the mirror is compared to data on ...
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110 views

Setting up software RAID 1 on Linux

So I'm trying for the first time to create a software RAID 1 array and install Linux (Mint) on it. I've physically installed 2 500 GB SATA Seagate drives, and now I want to create a RAID 1 array. ...
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388 views

HDDs occasionally “click” and dump this error

Every once in a while, my HDDs (6 1TB drives in a Linux md RAID-6 array) make a brief "click" sound, and I get this from dmesg. I don't really have any clue how to start diagnose this, or even how ...
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275 views

Why RAID1 is resynching so long?

I have created RAID1 array of two identical empty partitions. Now it is saying: $ tail -f /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : ...
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28 views

Does RAID1 really protect me?

I have 2 drives mirroring each other. They are pluggable and occupying 2 SATA slots. Totally I have 5 SATA slots. Can I freely unplug RAID parts and then plug them back and have data intact? If not ...
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230 views

Intel Rapid Storage Technology RAID - what can you schedule?

I am about to get a new laptop and I am considering using the Intel firmware RAID to set up RAID-1. I am researching what features it has. I found the following screenshot of the Intel Rapid Storage ...
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76 views

How do I know if one of my RAID 1 drives died?

Lets say I have a few HDDs in a RAID 1 array. From where will I know that one of my HDDs is dead? Is there some kind of automatic alert system or do I have to check it manually? If I have to check it ...
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131 views

How to enter RAID config on ASUS P7P55-M motherboard?

This motherboard is said to support Intel Matrix Storage Technology Support RAID 0,1,0+1,5,10 https://www.asus.com/Motherboards/P7P55M/specifications/ I am not familiar with this technology. ...
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173 views

BTRFS or LVM heterogeneous RAID

I'm entertaining creating a largish (3.5TB+) backup server for my family. I already own enough hardware, and I don't want to buy any more right now. The config I envision look like this: Two 1TB ...