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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mdadm: Win7-install created a boot partition on one of my RAID6 drives. How to rebuild?

My problem happened when I attempted to install Windows 7 on it's own SSD. The Linux OS I used which has knowledge of the software RAID system is on a SSD that I disconnected prior to the install. ...
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562 views

Windows 8 keeps deleting files from RAID drive

I have an ASRock Z77 Extreme4 motherboard with Windows 8 (not Pro). Brand-new computer, built from new parts. I use a 600GB drive (10,000RPM) as boot drive (let's call it HD1) and 2 3TB drives in a ...
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194 views

Use Intel Rapid Storage Technology with a secondary PCIe RAID card

I have Intel's RST on motherboard using RAID1 (2x2TB) and a boot drive. Trying to add another RAID1 (2x3TB) has failed since RST is limited to 2.2TB for RAID1. Now I've bought another RAID card in ...
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1k views

Does TRIM avoid the performance impact of mdadm RAID 1 on SSD?

It has already been mentioned in other questions that Red Hat recommends against using mdadm RAID 1 on SSD. Red Hat also warns that software RAID levels 1, 4, 5, and 6 are not recommended for use ...
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26 views

Dual boot, 4 disks, raid0

I have windows 8.1, and ubuntu 14.04 on the Disk 0. On ubuntu the four disks are merged. on windows i want to merge disks 1,2,3 (the windows half). but when i click to new striped volume, it says ...
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115 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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59 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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332 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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1k views

Very slow volume expand on Synology ds2413+

I've posted this elsewhere on the internet aswell, and will obviously reply in both places if a proper solution is found. I am attempting to expand SHR volumne (2x4TB, 1x2TB) with additional 4TB ...
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89 views

btrfs does not show drive as missing

I am trying out btrfs and I noticed some funny behaviour: I have two drives in a raid 1 configuration. sudo btrfs fi show Label: none uuid: 52b9c6f6-ce5c-4727-861e-e2fd012e475f Total devices 2 ...
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68 views

For raid1, does btrfs check which partitions are on the same device?

I have btrfs on two partitions using btrfs's raid1 mode: /dev/sda3 /dev/sdb3 Now I plan to run btrfs device add /dev/sda2 /dev/sdb2, so I'll have four partitions: /dev/sda2 /dev/sda3 /dev/sdb2 ...
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285 views

Trying to rescue data from WD My Book Studio II, raid 0

For a friend I'm trying to recover data from a Western Digital My Book Studio II external disk drive enclosure in raid 0 mode. At first I tried to rescue the data under OSX, the OS used by the ...
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97 views

SSD cache to minimise disk uptime

I am planning to build a small server for personal use, utilising a relatively large RAID-5/-6 (or RAID-Z/-Z2) array as main storage. The vast majority of workloads I envision for this would have ...
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191 views

How to create RAID array using Disks app in Ubuntu 12.10?

Ubuntu 12.10 has an app called Disks that used to be called "Disk Utility" and "palimpsest". This tool used to be able to create RAID arrays, but on a clean install of Ubuntu 12.10, the app no longer ...
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425 views

Cloning Ubuntu mdadm RAID1

I would like to clone a pair of RAID1 drives created with mdadm. I've tried Clonezilla, but there's no native support for mdadm, so it resorts to using dd which is incredibly slow. I've looked for ...
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491 views

Booting Windows7 kernel from an initrd/wim image file

I'm wondering if it's possibile to have Win7 kernel and relative drivers (especially storage drivers) to boot from an initrd-like image file (maybe .wim?) and later then mount the windows root ...
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276 views

Reading or writing with a 4 WD5000AADS drive RAID 5 array drops to 0 speed

Edit, 10/31: Crash-- complete system lockup. Booted computer, had strange lag for visiting ANY webpage in Chrome.. Figured that either a network problem existed, or Chrome could not write to disk ...
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651 views

Windows Server 2008 RAID 1 failed. How do I fix it?

I have two 1.5TB drives, set up via a 4-bay external HDD case. It connects via eSATA and USB 2.0. I had it configured as a mirrored RAID 1 in Windows Server 2008. I transferred some data to it and ...
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6 views

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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39 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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78 views

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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18 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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93 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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87 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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30 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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56 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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95 views

Do SSDs have to have AHCI to maximize performance?

After my last post concerning my motherboard's RAID, I'm considering purchasing an additional dedicated RAID controller, but I have a few concerns about what to buy, because I'm facing yet another ...
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80 views

gdisk doesn't recognize RAID0 disk as size of whole array?

I put in two Samsung 840s at 256GB and RAID-ed them together and installed Windows 8. I'm having trouble using gdisk to get ready to install Linux. gdisk sees the array, /dev/sda0, as a whole ...
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106 views

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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106 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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124 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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18 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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305 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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410 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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30 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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150 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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316 views

How to install Dell T3500 RAID Drivers via unattend.xml?

I work for a medium sized company and, due to the recent XP phaseout, we're rolling out Windows 7 on newer machines throughout the company. Unfortunately, we've had problems doing so as the computers ...
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188 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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67 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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13 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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171 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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170 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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32 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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218 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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111 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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184 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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41 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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34 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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100 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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295 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 ...