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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Linux MD software raid stripe cache size

From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory. By increasing this value you can get a ...
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Is there a way to restore previous file tree structure?

I lost a large portion of files on an ext partition, that is in mirrored RAID. It looks like half of data is wiped out. The files are missing and space is reported as free. The contents of lost+found ...
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115 views

LSI MegaRAID X99 / Haswell-E

Does anyone know if LSI MegaRAID cards will work with the new X99 chipset? I've seen some reports of people using CPUs / Chipsets not on LSI's compatibility matrix, but that information is hard to ...
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49 views

Importance of TLER in Windows 8 RAID0 application?

I am looking to buy two drives to RAID. (Edit: I understand that RAID0 doesn't fit the Redundant part of the acronym, but it is listed as a standard RAID level on Wikipedia.) I'd like to create a ...
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52 views

Drives Disappear when Turning off Raid

I have a Dell Workstation T7610 with a 256 gig SSD and a 2 TB HDD. When I try to disable the raid controller the drives disappear in the boot order. How can I keep the drives active without having ...
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26 views

How to read data from a Raid 1 drive

I have a Sharecenter NAS with two hard drives in it setup in a Raid 1. One of the drives has failed (making noise) and somehow so has the Sharecenter. I have a SATA-USB thing but my Win8 machine ...
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Is a home NAS reliable to keep your data on (no other backups)?

The question came up while I was thinking to move some data (e.g.) pictures, old but important other data solely to the NAS (private use, no business level). My NAS is a simple 2 disk RAID system. I ...
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132 views

Debian shutdown takes a long time (RAID/crypt related)

I'm running Debian Jessie and recently my shutdown has been taking a long time. When I sudo shutdown -h now I'm sent to a blank screen except for a blinking cursor which sits for ~1 minute. It then ...
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198 views

How to monitor BTRFS filesystem raid for errors?

I saw some documentation on a daemon that can execute a program/script for various BTRFS events, but I cannot find it anymore. How can I have a script/program be executed on a drive failure for a ...
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29 views

How do I remove a partition inside linux software raid?

I have this SSD disk as sdg which is in software raid (with sdh, it's corrupted but it doesn't matter now) I need to remove partition vg00-data (dm-2) /data What command can I use to do that? OS ...
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27 views

Is it possible to configure a Sata RAID Controller without RAID

I have a 6 port SATA RAID card (taken out of an HP ML150 G2 server). What i want to do is connect the Sata Hard Drives that i have to this card without formatting or loosing any data on the hard ...
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40 views

P8P67LE Motherboard - SATA MODE RAID; Create RAID 1

As it seems my ASUS P8P67LE motherboard has built-in RAID capability. My OS is previously installed in normal mode and in BIOS setting SATA MODE is set to AHCI (Advance host controller interface) ...
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153 views

How does one enter RAID configuration on ultrabook devices, such as Asus Zenbook UX301-LA?

This laptop has two SSDs which come configured from the factory in a RAID-0 configuration. At the time I was running VMs and other similar workloads on this machine, so I forced the machine to expose ...
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31 views

Non-RAID Disk showing as RAID

The disk in question is attached to a single ESATA port on the back of my computer. The other ESATA port has nothing attached. In the BIOS, the controller for that port is turned on, and set to SATA ...
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34 views

OCZ Vertex 4 64 GB timeouts on Areca 1880IX-16-4G

I use 3x OCZ Vertex 4 64 GB in RAID5. If they work then it's all ok, but suddenly random drives are dropped from array with timeout errors. Sometimes even two of them which causes filesystem errors. ...
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41 views

Hooking up Raid0 drives to Dell XPS

I recently dug up a pare of WD Raptor 74GB hard drives that I had once upon a time in an older custom built computer they were RAID0. I now have a Dell Studio XPS 8000 desktop that I'd like to see ...
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27 views

Can I recover data from a partially RAID 1 system?

I recently bought two 1TB HDDs because I wanted to build a RAID 1 system. I didn't want to lose 1TB of space so using the Windows 7 disk management I mirrored 700GB and kept the rest as a simple ...
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65 views

RAID-0 setup, 1 broken drive, still 1 partition seems unharmed. Why?

It is not my setup and I do not know a lot about RAID, so I have trouble analysing what is going on here: What I observed: Two 1 TB HDDs are in a RAID-0 Array GParted sees 2 (1 TB) partitions ...
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266 views

Windows 8 wrongly detects my Raid1 HDD as Solid state disk

I have upgraded my machine from Windows 7 to Windows 8 and then Windows 8.1 (this is the only available upgrade path to keep my files, settings AND applications). My system is setup as follows: 2 x ...
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20 views

Finding reported drive errors in Windows RAID

This machine has been through a number of RAID configurations. Most recently, it had a single drive (Disk 1) installed without mirroring, and without error. A second drive (Disk 0) was added as a ...
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43 views

Invalid system disk message, but no data loss

I built my own computer a about 7 months ago and everything was fine until I was playing game and it blue screened. After it blue screened and I restarted my computer I got a message, "Invalid system ...
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92 views

Replaced a RAID 10 drive on my Debian server - what do I do next?

I have 4 x 3TB drives in a RAID 10 array. One failed, so is now removed. /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : active ...
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32 views

Secure copy one folder to multiple destinations in OS X

Sorry for asking what looks like a question that's been asked a few times. I'm very far from being a super user, which makes it very difficult for me to be able to expand on a relatively complex ...
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74 views

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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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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491 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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94 views

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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74 views

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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46 views

RAID 1 scalability [closed]

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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70 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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16 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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60 views

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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92 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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27 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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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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19 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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64 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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75 views

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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100 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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40 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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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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150 views

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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461 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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743 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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129 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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66 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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840 views

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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2k 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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70 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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86 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 ...