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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Rebuilding FakeRAID RAID 5 with new disk, no partitions show up, invalid PMBR

I have a RAID 5 array with 4 2TB disks on a HP Z800. One disk failed and was swapped out for a new one. I went into BIOS Intel Storage Matrix Utility and set the Array to rebuild with the new disk. ...
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172 views

SSD RAID in Haswell NUC with Ubuntu: Does TRIM work?

I want a low-power, small, silent x86_64 Ubuntu computer with storage that's resilient against hardware failure of a drive. I'm thinking of buying D54250WYKH or D34010WYKH, one mSATA SSD and one 2.5" ...
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214 views

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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109 views

Linux access to Windows 7 dynamic volumes (striped or mirrored)

I'm considering setting up a dual-boot system for the first time for many years. My plan for the system is to set it up as follows: SSD for both system partitions 2 identical hard disks, split ...
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253 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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152 views

how to trim the SSD disk of an hybrid Linux soft RAID?

We are considering implementing an Hybrid Linux Raid with SSD+HD by using the "writemostly" flag that supposedly makes the raid write further to the HD than to SSD while maintaining the benefits of ...
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61 views

Courting Disaster with fakeRAID10 (Dual Boot Win7,Ubuntu14.10)

Over the past several weeks (!), I have been trying to set up a dual boot with Windows 7 Enterprise and Ubuntu Desktop 14.10. The motherboard is a Sabertooth x79, and I wanted to install everything ...
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45 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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217 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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78 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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933 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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168 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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137 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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96 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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389 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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111 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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2k views

Trouble Mounting (Intel) RAID in Debian

I am switching to Debian from Ubuntu and so far all is good, however, I can't get Debian to read one RIAD drives. I have three physical drives setup, using Intel Matrix Manager, for a RAID5 volume ...
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194 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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528 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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983 views

grub refuses to install to raid array

I have a software raid 0 setup with dual booting Windows 7 and Ubuntu 12.04. The GRUB bootloader that is already on the hard drive seems to work fine. However, since the latest package update for ...
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610 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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303 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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701 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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51 views

Fail device in md RAID when ATA stops responding

I had created five 1TB HDD partitions (/dev/sda1, /dev/sdb1, /dev/sdc1, /dev/sde1, and /dev/sdf1) in a RAID 6 array called /dev/md0 using mdadm on Ubuntu 14.04 LTS Trusty Tahr. The command sudo mdadm ...
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25 views

Optimal load balancing between two hard disks. Does RAID 1 do the trick?

I am looking for a linux disk system for streaming media purposes that would do smart load balancing and minimize hard disk wear. To illustrate my points, lets take a physical hard disk device and ...
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15 views

btrfs not distributing data to smaller disks in 4-disk RAID1 array

I have a btrfs filesystem composed of four disks of sizes 3TB, 3TB, 1TB, and 1TB, configured in a RAID1 (data and metadata). I've noticed that btrfs doesn't seem to want to use the smaller disks at ...
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68 views

Alignment with RAID-6 (mdadm) + LUKS + XFS

What I want: I have a 4x4TB RAID-6 array with mdadm. I want the storage to be encrypted and plan on using LUKS. I will most probably use XFS as filesystem. I will add more disks to the array as ...
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29 views

Degraded RAID 5 array, can't add replacement drive

So I've had two drives that have been marked as faulty spares in my RAID, I've removed them then I tried to --force assemble the RAID but this came up - mdadm: /dev/md0 assembled from 2 drives and 1 ...
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51 views

how to mount a XFS filesystem in LVM volume with RAID0 having a bad disk?

I have a small NAS with two 500GB disks in a RAID0 (JBOD) setup. (I know, I know, big mistake... as you will see...) Now, one of the disks started to fail (Murphy is always right, isn't he...) I ...
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49 views

Bad Magic Number in Superblock or Not a Block Device

I'm having some real problems getting a drive to have any working partitions on it at all. The drive is a 2Tb one from a NAS that I'm trying to repair. I've written zeros to the first 77Gb of the ...
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16 views

Intel RST turned a disk off

I have an Asus ROG laptop and I got a BSOD while I was working and then after the restart, one of my partitions disappeared. This used to show two disks but it only shows 1 disk and the cd drive. ...
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61 views

SSD's or HDD's in a LANcache?

I am building a LANcache for a lanparty that I'm organizing. We have about 80 visitors (pretty small LAN), but our uplink is limited to 100mb/s due to reasons and it's constantly saturated with game ...
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61 views

SSD cache, SRT, Raid 0 : speeding up my C drive

I have a Z97 rig and I'm interested in speeding up my disk drives. This is my current setup: 1) 240GB SSD for main disk 2) 500GB hard drive for User Files 3) 120GB for photo editing (I move files ...
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48 views

RAID5 active device failed during reconstruction

I have this Linux RAID5 array with 4 2TB harddisks, with 3 active device and one spare, giving me a total disk size of around 6TB. Recently one drive (sdd) is starting to give me some SMART errors, ...
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96 views

Intel RAID controller failing to diagnose faulty disk

On my system (running Windows 7 x64) I have an Asus Z87 Deluxe motherboard, with a built-in Intel RAID controller; my config includes a Kingston 240-GB SSD disk for the OS and two Western Digital 4-TB ...
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21 views

RAID configurations are resetted after reboot-Ubuntu Server

I have configured software RAID 1 in Ubuntu Server. I have created RAID 1 and now one of the Disk fails so I removed it. I had attached a new disk. Created partitions as same like /sda from fdisk. ...
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77 views

Does the RAID 5 parity drive have to be same size as the rest of the array?

In the most basic RAID 5 array, does the parity drive have to be the same size as the other 2 drives? Standard Array: 1x4TB Drive (Storage) 1x4TB Drive (Storage) 1x1TB Parity Drive Or will the size ...
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33 views

Can I reuse an overheated HDD after formatting in a ZFS RAID0?

I have a WD50EFRX which overheated according to SMART data (95 degrees celsius) and damaged some blocks (raw value of Raw Read Error Rate ~ 22000). There're no other values besides the Raw Read Error ...
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27 views

RAID: Switched from W2K12 Hyper-V to Ubuntu

Until yesterday I was using Windows Server 2012 Hyper-V. I had two RAID sets: one 600GB (2 disks) and one 3TB (2 disks). The first was connected to Windows Server. The second was passed through to an ...
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39 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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62 views

How can I re-establish my RAID5 Array (Intel Rapid Storage)?

I had a RAID 5 array, but two of the drives dropped from the array. (While troubleshooting another issue ASUS suggested I update my MoBo BIOS, but neglected to tell me this would corrupt my RAID ...
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103 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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208 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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27 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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275 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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211 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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179 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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57 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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123 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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258 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 ...