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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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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133 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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158 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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21 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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498 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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663 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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37 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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201 views

ZFS and FreeNAS: Mirror using half a drive

I'm planning to set up a FreeNAS server with two of my spare drives: 1x 1TB drive 1x 2TB drive Both drives are identical besides their capacity and neither has any data on it. Is it possible to ...
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278 views

mdadm: faulty Array, how to get recover as much as possible?

I have a RAID5 with 4 Disks in my PC. All of them were healthy (and the RAID itself) until before. I tried to install windows 8.1 which automatically creates this "SystemReserved"-Partition. The ...
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83 views

Dell Studio Slim 540s JBOD RAID

I'm working on a Dell Studio 540s that has dual 750GB drives in what appears to be a JBOD configuration. The computer reports "Missing operating system" at boot. The BIOS appeared to have been ...
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15 views

Intel RAID within the motherboard persistence information

I was wondering: where the Intel RAID (fakeraid) controller available on many mainstream motherboard persist the raid information? On the disks or in some solid memory on the motherboard? EDIT BTW I ...
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261 views

How to determine cause for failing RAID arrays

I have to investigate a recent increase in failing RAID-1 (Mirror) arrays we're encountering in our installed PC park (10K+ PC's). The problem is twofold: one part of being a pilot phase we started ...
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297 views

Repair Windows software RAID 1

I have a Windows software RAID 1 array that has apparently broken without my knowledge (thanks, Windows!). How can I regain control of it? The way I see it, I have two options: Break the Array - ...
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39 views

A few questions about windows 7 snapshots

I have been googling a while, but I am a bit confused about Microsoft VSS technology. Currently I am running Windows 7 Enterprise 64bit - everything patched to the latest versions. My system has one ...
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307 views

Rebuilding a RAID 1 without data loss, recover from unallocated partition data

Mobo: ASUS P8Z77-M/Pro Gen 3 RAM: 32GB (4 x 8GB) Power Supply: corsair HX850 HDDs:Configuration before the problem: 1 x 128GB SSD for Windows 7 professional 64-bit 2 x 3TB drives in RAID 1 on the ...
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146 views

SATA-II SSD Raid 0 slow on Windows-7

I have 2 SSDs and made a RAID 0 with the on-board controller of my mainboard. But i only get 130 megabyte/second average read/write speed which seems to be pretty slow for me even for SATA 2 which ...
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251 views

Create a mdadm raid mirror of an existing lvm

Hello I'm trying to figure out how I can create a pretty strange mdadm mirror of my lvm. I have 4 disks, (sda,b,c,d). Each disk has 2 partitions: 1Gb - physical volume 500mb - Swap My system lvm ...
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46 views

erased md0, md1 and can't recreate them

I previously had a working RAID 1 array. I think as a result of running grub-install /dev/sdb and grub-install /dev/sdc I somehow wiped my computer of md0 and md1. I need to set them up again. When ...
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42 views

Progressive upgrade of a RAID array

Our group has a 16 disk backup RAID6 array. Currently, those 16 disks have the following specs; 500 GB 16 and 64MB cache 3 Gb/s SATA I would like to begin upgrading these disks if possible, ...
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125 views

How to add extra sata drives to desktop server

I have an ubuntu 12.04 machine with a raid using mdadm. The motherboard has 8 sata ports which are all being used, and I would like to add more hard drives to it. What's the easiest/best way to add a ...
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369 views

blkid not returning the correct UUID/label for drive

I have 7 drives in my server (running Debian Wheezy as dom0 for a Xen hypervisor): An 80GB system drive, 3 x 2TB drives, a 1TB drive and 2x 500GB drives. The 2TB drives are all part of an mdadm RAID ...
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138 views

Linux kernel 3.9 new storage features howto?

Linux kernel 3.9 has been released, which brings new features for storage cache devices (dm-cache), as well as BTRFS RAID 5/6. These features are undoubtedly sexy, but are all but completely ...
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60 views

Software RAID failed to mount after apt-get upgrade

I have a software RAID 10 (jfs) on an ubuntu 12.10 and require some assistance repairing the RAID after it failed to mount after a routine apt-get upgrade followed by a reboot. /dev/md0: Version : ...
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396 views

Broken mdadm RAID after hard drive firmware update

I updated the firmware on the two hard drives in my raid array, and now the raid array does not seem to work. I'm running Kubuntu 12.10. Here is the output of some things I tried: sudo mdadm ...
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225 views

Troubleshooting XFS performance (number of cylinders reported by

I have two servers with identical hardware, both running CentOS 5.8. They both have 40 TB external RAID arrays attached (via eSATA) to LSI MegaRAID SAS 9280 cards. The array has a GUID partition ...
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251 views

Intel Matrix Storage controller black screen after reformatting the disk

I have a Dell T3400 PC with an Intel Matrix Storage controller and two disks which were in a RAID-1 configuration. I took out one of the disks and installed Linux on the other disk, breaking the RAID ...
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142 views

Raid 0 (OS) + SSD Cache, what are performances like compared to pure SSD (OS)

I'm considering a RAID 0 setup with an SSD cache drive. Will I see a noticeable difference in speed with the SSD cache drive, will this even work? No I will not install the OS on the SSD. I'd prefer ...
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226 views

RAID-0 bottlenecking when reading and writing simultaneously?

I have 4 Samsung 840 Pro SSDs running in hardware RAID on an Intel RS2BL080 LSI RAID card. My read and write times are incredible: $ dd bs=1M count=10000 if=/dev/zero of=test.img conv=fdatasync ...
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271 views

TRIM support on Intel RS2BL080 Hardware RAID card?

I've got an Intel RS2BL080 hardware RAID card and I'd like to know if it supports TRIM on my RAID-0 array of SSDs. I've heard that the Intel 7 series integrated RAID solutions that ship with ...
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334 views

Asus Sabertooth 990FX RAID - Drives disappear

Just got a 990fx 2.0. I'd like to setup two Seagate 1TB drives in a RAID 1 config and same thing: Detected under AHCI but as soon as the SATA ports are config'd to RAID, they aren't detected. I don't ...
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59 views

Test my RAID 0 with a cache ssd attached using checksums?

I was hoping to use a ram drive to store a randomly generated file that is written to the raid 0 array, and then read, and checksum is verified against what's on the ram drive. Lather, rinse, repeat. ...
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109 views

Problems with Fujitsu SAS hard drive on Intel server

I have a Intel S5000VSA server with two Fujitsu 250 GB SAS hard drives. My Windows installation was damaged and I couldn't boot my server with Live Windows. Now I want boot them with RAID card on my ...
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58 views

Software RAID 1 resync's on SATA cable switch?

I made a mistake when I opened up my desktop removed a 2 disk RAID 1 and reconnected them, but with the SATA cables switched, such that sda became sdb and viceversa. On boot, the RAID array started ...
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269 views

Intel DX79SI won't work with RAID-1

I built a brand new system, that has an Intel DX79SI mainboard, 16 GB DDR3 (four fours), nvidia geforce gtx 470 (from older system), coolermaster 700w psu from older system, intel core i7 3820, latest ...
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53 views

Why does it say that Raid 10 recovery is not supported?

I have a QNAP with a 8X2TB Raid 5, that I am going to replace to a 6X2TB Raid 10 + 2 hot spares RTFM on my hardware, I noticed something, which I don't understand, and hoped someone can enlighten me: ...
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256 views

Windows XP 64-bit hangs

I have a Windows XP x64 box showing a couple of odd behaviors. First, the system is hanging after it has been up for about ten minutes. All applications stop responding, Ctrl + Alt + Del does nothing, ...
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123 views

windows 7 fails to install to raid 0

I recently purchased 2 120gb ocz ssd's and my goal is to install windows 7 64 bit to them in a raid 0 array. What I've ended up with is 2 computers torn apart, my tv disabled, a bleeding thumb and no ...
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220 views

Why wont my computer boot from the logical raid volume while installing Windows 7

I have new computer I built the motherboard is an ASUS Sabertooth 990FX. The motherboard has UEFI instead of normal BIOS. The problem I have is when I try to install Windows 7 with my motherboards ...
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156 views

How to boot from an IDE Drive on a new Mobo

I currently have a desktop with a mobo that has no IDE slots and i'm trying to boot from an old IDE 32Gb HDD. So i bought myself a PCI Express card that allows the interface and i was able to access ...
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1k views

CentOS - Add additional hard drive raid arrays on Dell Perc 5/i card

We have a Dell Poweredge 2900 system with Dell Perc 5/i card and 4 SAS hard drives attached, with NTFS partitions on them. We installed CentOS on one raid array on this controller with a different ...
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707 views

Ubuntu raid configuration lost after reboot

I have a JMicron raid controller on the motherboard, and I have a menu in which I can set RAID arrays when the system boots. I've set it to RAID-1 and added my two identical 2TB disks (the OS disk is ...
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2k views

Computer Slows to crawl after Event Id 3, some issue with Raid Port 0

Recently my computer randomly hangs, crashes and slows down at night, when I click on something when I wake up the computer just doesn't respond and shows the loading thing for my cursor. Today, I ...
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1k views

mdadm: hot remove failed

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
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350 views

How is WHS 2011 handling backups of a mirrored drive (RAID-1)?

I have Windows Home Server 2011 automatically backing up my PC. The relevant specifications are that my 500GB system drive is a software mirror and my PC is running Windows 7 Ultimate SP1. I expected ...
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70 views

Maintaining peak IO potential with DD / CP

I wanted to copy a file (40 gig dataset) from a single drive to a dual disk raid-0 drive. I tried with CP and it sustained read - 4mb and write - 11 mb (doesn't make sense I know (must be the stripe ...
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250 views

What caused my RAID 5 array to become corrupt?

My machine has an Intel ICH9R RAID controller built in to the motherboard and an additional SIL3124 controller. I had two 1Tb hard disks in a RAID0 array on the Intel controller and 3 1Tb disks in a ...
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520 views

hdparm: 500, 200 and 20MB/s as results, within seconds?

No, nothing is running on the server. [root@~]# hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 1672 MB in 3.00 seconds = 557.18 MB/sec [root@~]# hdparm -t /dev/sdb /dev/sdb: Timing ...
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109 views

Rosewill RAID Enclosure - Adding a Second Card

I have a couple of Rosewill RSV-S5 RAID enclosures. Each one comes with a PCI express card to act as the RAID host. However, on my host system (Slackware 13.1.0 running Linux 2.6.33.4) I'm just ...
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794 views

Windows 7 Will not boot from SSD when other Controller has raid enabled

I have recently put together a new high-end gaming / work PC. The relevant hardware items for this problem are as follows: 1 x ASUS Maximus IV Extreme-Z Intel Motherboard 2 x Western Digital Caviar ...
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320 views

RAID 5 volume fail with only one bad disk

My motherboard is an MSI Big bang xpower with a RAID 5 running Windows 7. The ICH10R on the motherboard controls the RAID. Recently a power interruption occurred and the RAID was not able to ...