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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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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20 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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53 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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167 views

Is Btrfs vulnerable to RAID write hole effect?

If not, does it mean that Btrfs in RAID mode is fully resistant to power failure?
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53 views

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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1answer
141 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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54 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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36 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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35 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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2answers
162 views

RAID1 drive failed; partition missing after reboot

I think I shot myself in the foot here, but let me quickly divulge what's happened: Intel Matrix Storage Manager started reporting that one of the two disks I had in a RAID1 array configuration had ...
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4k views

2nd HDD not showing up in “My Computer”. Using SSD as main drive

I just set up my new computer. Built it from scratch. This is my second machine I built so it's not a hobby I'm very proficient at yet. I have a 60gb SSD and a 1.5 TB HD In bios I set up my SSD ...
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48 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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15 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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606 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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1answer
26 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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1answer
52 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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23 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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66 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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15 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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49 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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87 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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50 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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28 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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14 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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1answer
120 views

recover a raid disk which apparently has no errors

For several years now we run a software RAID1 on a old Gentoo box with a custom Linux 2.6.31. The RAID consists of 2 harddisk with 4 partitions each. In the last years it happend about 3-4 times that ...
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148 views

Adaptec Raid Controller 6405E slower than onboard raid?

Running on Windows 8.1 x64. Raid is 0 on two Samsung Evo SSD. Both read and write cache is enabled. Here's result from onboard raid (ASUS-P9X79-E-WS): And here's from the dedicated raid controller ...
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1answer
102 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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40 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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1k 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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1answer
53 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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How to fix missing RAID1 drive

I had to do some fiddling about with my cables inside thebox and now I am getting a "Critical Error" about the RAID disks during startup. I have a gigabyte GA-MA770T-UD3 motherboard. Aparently the ...
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63 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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30 views

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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112 views

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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28 views

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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15 views

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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1answer
25 views

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
24 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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43 views

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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58 views

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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86 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 'logical ...
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24 views

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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1answer
65 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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1answer
54 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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1answer
71 views

Running OS image from Dell Laptop (set to RAID mode) in VirtualBox [duplicate]

I have two SSD images from two different modern Dell laptops that use the new BIOS that allows you to set your boot mode to "legacy" and then set your SATA mode to AHCI or "Raid mode" (Intel Rapid ...
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81 views

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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93 views

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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1answer
62 views

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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68 views

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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44 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) ...