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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Installing CentOS 6 on Asus M3N78-EM using CentOS software raid / LVM

I have an Asus M3N78-EM motherboard with 3 WD 250GB drives connected to SATA ports 1-3. The BIOS currently is setup to see the drives as AHCI instead of raid due to the controller driver not being ...
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Dynamic/Static striping across BTRFS raid groups

I'm looking to set up a new storage server and would like to use BTRFS to protect against bit rot. Ideally, I would like a setup as a theoretical (btrfs) raid6 (both data and metadata) for every group ...
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Raid 5 Degraded

I have a dell PowerEdge T110 with a raid 5 array that says it is degraded. This uses a perc s100 controller. I am using 4 74gb raptor drives for the array. The computer tries to boot but it hangs on ...
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22 views

Mounting disk(s) from RAID 1 array for data recovery

I'm having some problems with a Debian 7.5 stable (Wheezy) server. It is currently running at Rescue Mode. It has a 2 x 2000 GB HDD running in a RAID 1 array. My immediate priority is to be able to ...
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Is it possible to convert a btrfs RAID5 to a RAID6 with the same disks without losing data?

How would I convert an existing RAID5 (single parity) btrfs setup to a dual parity RAID6 configuration given enough free available disk space, using the same disks, without swapping out data ? ...
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mdraid 512/4096 sector confusion

I created a new mdraid array on 3TB disks, connected via USB (because the internal SATA ports were used for the old array). $ fdisk -l /dev/sdb Note: sector size is 4096 (not 512) Disk /dev/sdb: ...
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27 views

RAID 1 scalability

Assuming I'm in a home environment and I want to keep my data secure, how would I build an expandable custom NAS? I can't afford a real SATA/SAS controller. I'm thinking of a scalable array of RAID 1 ...
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24 views

How can I install Windows through an ASUS P5Q's orange and white SATA ports?

I have an ASUS P5Q motherboard, which apparently has two SATA controllers - the standard Intel one (red ports), and a Marvell controller (orange and white ports). I need the Intel controller to be in ...
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13 views

Attach SSD next to the RAID

I have an IBMX3200M3 with a 4 HDD in RAID1 and now I trying to attach an extra SSD just to a SATA port on motherboard... After system fails to boot up from the RAID and anything and i finish up to ...
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I'm thinking of purchasing a Supermicro 6017R-TDF 1U 4 Bay for a Domain Controller is this a sufficent solution for a small business [closed]

I'm thinking of purchasing a Supermicro 6017R-TDF 1U with 2 Xeon 6 core 2.6GHz, 15mb, and 4 SATA's in a RAID 1 config for a Domain Controller. The server HDD will only be used for OS. The Raid ...
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Configuring Grub2 on a second raid 1 hard drive on Fedora

Im trying to reconfigure grub to install on both /dev/sda and /dev/sdb, but the only command I have been able to find is dpkg-reconfigure grub-pc, which isnt really helpful since I am using rpm. Is ...
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15 views

Having trouble setting up RAID 1 on Fedora

I have been working for a while to setup RAID 1 on my fedora server. I have one installed with Fedora, 1 blank but partitioned. The one with fedora is /dev/sda and the blank one is /dev/sdb. I tried ...
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4 views

mdadm on Debian 7 forgetting about a disk

I have a degraded RAID1 array running on Debian 7. I am trying to add another disk to the degraded array, but mdadm forgets the existence of the other disk at reboot. The array devices are /dev/sda1 ...
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22 views

Improve slow NAS Ethernet transfer speeds: On-The-Fly Ethernet Compression with SAMBA?

Hardware: Pogoplug E02 (ARMv5te, Marvell Kirkwood 1.2GHz, 256m RAM) Software: ArchLinux, MDADM RAID 5 array, Ext4, SAMBA server This setup delivers file transfers to my Windows clients at ~21MB/s ...
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10 views

debian boot procedure stops while starting RAID5 array

imagine the following situation: debian wheezy 7.4 on arm system created a RAID5 with 3 disks /dev/md0 created ext4 file system wrote entry to mdadm.conf via "mdadm --detail --scan >> ...
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33 views

Raid Setup, 2 Hard drives - one shows in explorer

I got a new pc delivered to me and I go to start up the PC using a raid configuration. I then go to are you happy with these settingsand I select yes. Later on, I then notice that one of the hard ...
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Win 8.1 new installation - existing raid mirrors failed to load

I have just installed windows 8.1 on my tower PC, from previously having Win 7. This was a fresh installation with the OS partition formatted prior to installing Win 8.1. My spec is: X58A-UD3R mobo ...
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46 views

Linux RAID Re-Shape Stopped, unmountable

I added another drive to my RAID 5 and migrated it to a RAID 6. Everything went fine, but now the process seems to be stuck at 63.2% and md2_raid6 takes 99.9 of the CPU. RAID Details: /dev/md/2: ...
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16 views

Calculate storage capacity of RAID 2 / 3 / 4?

Given n drives and capacity s of each drive, how would I calculate storage capacity for RAID 2 / 3 / 4? For example, I know RAID 5's storage capacity can be calculated with the following formula: ...
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8 views

How to find how many HDDs are present in a NAS?

I'm logged into the web interface of a NAS made by LG Electronics. It is obviously running some Linux version : Linux LG-NAS-N1T1 2.6.30-nt1 #130 Sun Nov 28 15/31/54 KST 2010 armv5tel GNU/Linux ...
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Switch HDD mode from RAID to IDE [closed]

I made an ghost of 2 drives that were installed as raid 0 I made a ghost to one big drive. Now in the bios, the big drive can only run in raid0 modus. Is there a easy way so I can run this drive as ...
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32 views

Converting ASUS Zenbook from Win8 to Win7.. do i need raid drivers?

I've got an ASUS ZEnBook Prime, ASUS Zenbook UX301LA-XH72T 13.3" Touch Ultrabook and it runs 500GB SDD on RAID 0 configuration. This notebook is running Windows 8, and i desperately need to convert ...
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26 views

Recommended RAID5 stripe size?

I have a RAID5 array built from 4 1TB drives. I initially set the stripe size to 1M since I will be storing large files (much larger than 1MB). The NTFS cluster size is 64KB (largest possible). ...
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21 views

Configuring RAID on Intel DX58SO CTRL+I does not enter RAID Config Utility

I have two 3TB HDD plugged into SATA 0 and SATA 1. I configured the drives for RAID in the BIOS and now when I boot I see the RAID config screen. The screen lists all my drives as it should and says ...
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27 views

Usability of solid state drives after long term storage without without power

So, I was recently hired on to a company that has shipped out several 24/7 always on servers.. With solid state drives. I understand that SSD longevity has been improved upon, however to my knowledge ...
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Changing default cache policy online on LSI Megaraid

I am having a RAID 10 with 6 Harddiscs in my server. I had set the default cache policy to write through. After setting up the OS, i came to know the I/O rates are too slow. I read in some forums that ...
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125 views

Can I setup two RAID arrays on a single intel z97 controller?

Let me preface this by saying that I have never setup a RAID array myself, other than by using software RAID 0 in Windows for a set of storage drives. I purchased a new ASUS Maximus VII Hero ...
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21 views

What's the difference between a RAID enclosure, and a JBOD enclosure connected to a RAID controller

I've currently got an Areca ARC-1222 raid controller card connected to an iStorage Pro JBOD enclosure via miniSAS, on a mac, used for video editing. I'm speccing out a PC to replace it and have become ...
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32 views

RAID 0 or btrfs on two SSDs?

I have two 500 GB SSD's, and I would like to combine the two in some way to have 1 250 GB NTFS partition, and 1 750 GB btrfs or ext4 partition. As far as I see, I have two options: the Intel Rapid ...
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Linux RAID on top of LVM

I have LVM configured on top of RAID, but I was wondering how one would do RAID on top of LVM. Here's the scenario: I have a RAID 6 array with 4 X 3TB drives. 1 drive failed, badblocks reported 73 ...
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How to delete a disk from RAID 5 on QNAP?

I have a QNAP TS-639 with 3 x 1Tb disk configured in RAID5. Now I got hold of 5 x 2Tb disks and want to replace the 1Tb disks. I plugged in 3 x 2Tb disk in the empty slots and reshaped the RAID to ...
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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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Is RAID1 or similar needed for btrfs/ZFS to protect against bit rot?

I'm running a file server using Linux software raid, set up as raid6. As filesystem I've chosen btrfs. However, I'm not using btrfs own raid6 implementation as it's not very stable yet. So basically, ...
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DiskPart not listing HDD in Windows 8.1

I have two WD 2.0TB drives that I wanted to set up in a RAID 1 array. When I installed Windows 8.1 it saw both drives and I installed it on drive 0. However now that I want to use storage spaces to ...
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Windows Server RAID 1 Rebuild

I had software RAID 1 and both the drives in the server are faulty.The server was booted from secondary plex. So I removed the mirror of one faulty drive and asked the data center for a drive ...
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Can't get all drives to show up in windows (invalid dynamic disk)

I unplugged my hard drives a couple days ago as i wanted to re-wire the PC and tidy up some cables, However now i've plugged them back in i can only get one raid to show at a time. I have the ...
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Difficulty removing corrupt directory

I have two disks in raid 0. I ran fsck on them and long story short, didn't fix it completely. I found it is all in a single directory. I dont mind losing this dir completely so i tried to rm it. I ...
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Using Small RAID5's to prevent data loss

I'm currently using 3 RAID5 controllers in each of several media systems. This is being done in an attempt to preempt future data loss. I store large amounts of scanned, video and audio historical ...
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1answer
18 views

Format system and preserve RAID

I have a system on an SSD, and beside that, a set of 4 disks are connected over software RAID 5. I have a problem with that system now and I'd like to format that system and install a new one. If I ...
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Install Ubuntu on Hardware Raid 1 server , message partition disk

The installer has detected that the following disks have mounted partitions: /dev/sda/ Do you want the installer to try and unmount the partitions on these disks before continuing? If you leave ...
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mdadm raid 6 stuck on rebuilding

I have a raid 6 running consisting of 9 1TB drives. Some time in the last couple of days, one of them became faulty and the raid startet rebuilding. But apparently it is stuck ... This is the raid: ...
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Moving an existing windows8 installation onto raid

I've tried moving my current windows installation onto a raid0 array and I've run into issues I'm guessing have to do with drivers for the raid not being installed. I used gParted and dd to: backup ...
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58 views

What is the difference between “RAID10” and “RAID1 (With more than 2 disks)”?

What is the difference between "RAID10" and "RAID1 (With more than 2 disks)" ?
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Do I need to be worried about these SMART drive temperatures?

I have 5 hard drives in a machine sitting in a cupboard. /dev/sda is a 500GB Seagate drive, and is the boot disk. /dev/sd{b,c,d,e} are 2TB drives in a raid6 configuration. smartctl is showing ...
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Why does my linux box randomly reboot?

I recently had a raid5 array fail (two of four drives failed) on a headless machine I have sitting in a cupboard acting as a file server. I didn't have adequate monitoring in place, so missed the ...
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50 views

Windows recovery can't find Windows install

I'm trying to repair my boot loader for Windows after a Ubuntu install killed it. I'm trying to use the Windows Repair CD (actually USB stick), but Windows recovery can't find my Windows install. I ...
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Will hard disks go bad if not used? (Not connected)

I have a Seagate hard drive that I purchased in 2011, but not even taken out of its original packaging. This one was to be used as a spare disk, in case one of two similar drives in my RAID enclosure ...
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Linux partitioning scheme for Dell PowerEdge Server with 2x 2GB internal SD Card (RAID 1) and 10T SAS Raid 5

'm in the course of ordering a new Dell PowerEdge server to run XEN for virtualisation purposes on top of either Ubuntu or CentOS server. I'd like to put the OS on a flash drive to boot as fast as ...
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21 views

Best RAID Solution for dual boot?

I've seen this topic talked about before on this site but with other users using 2 drives for the active partition (booting from the same HDD thats got RAID) however my situation is a bit different. ...
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How to reconnect Raid drives

I'm running Windows 7 and had two 2T drives connected in a Mirrored Raid which showed as Drive E. Last week I noticed I have a new Drive G as well and on inspection, realized it was the mirrored E ...