Questions which refer to software RAID implementations.

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raid5 after changing disk, data disappeared in lost+found or?

I lost a drive so I stopped my array, changed the drive, reassembled the array. So far so good except that when I tried to mount the array I had an error about md0 file system (sorry I rebooted so ...
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15 views

mdadm --examine displays something different than --detail

Who should I trust to fill my /etc/mdadm/mdadm.conf ? mdadm --examine --scan returns /dev/md/0 while obviously it's /dev/md0 that is currently rebuilding What should I put in my /etc/mdadm/mdadm.conf ...
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20 views

Windows not loading after 1 RAID-5 disk failed

I left my PC turned off for just over a week while I was away. When I turned it back on it said my RAID-5 status was degraded and Windows did not want to load. I replaced the faulty disk and set it ...
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Updated CentOS kernel to 2.6.32, system won't boot because mdadm array can't be checked/isn't mounted

Just updated a FreePBX system, kernel is now at 2.6.32. Have two RAID 0 arrays that mdadm arranges in RAID 1. Worked fine up until this update, now I get fsck.ext4: No such file or directory while ...
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36 views

Growing an encrypted RAID5 array without causing alignment issues

Question Is there anyway to tell mdadm to make sure a certain logical sector on the RAID-device stays aligned to the beginning of a stripe when growing a RAID5 array? Problem My RAID5 is encrypted ...
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1answer
40 views

mdadm: Reactivating RAID6 array after improper shutdown

I have a seven-disk RAID6 array on a file server. The server experienced a crash and a hard reset was required, resulting in an improper shutdown. Note that I/O activity was likely occurring on the ...
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2answers
61 views

Removing a disk from an Ubuntu mdadm RAID marks the array as inactive, instead of degraded

I'm setting up a mdadm raid 1 array on Ubuntu 14.10 under VirtualBox. Everything works fine: The raid 1 is set up with /dev/sdc1 and /dev/sdd1: Personalities : [linear] [multipath] [raid0] [raid1] ...
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2answers
27 views

MDADM says can't assemble RAID5 because missing disks but all disks are there

To start this, I installed a SATA expansion card so I could get more Drives into the computer. I moved the RAID to the expansion card, after attempts failed to get the OS SSD onto them. There was a ...
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1answer
29 views

Would software RAID 1 be broken if I move both drives to a new PC? [duplicate]

Does a RAID 1 setup by software (win) break once you move both drives to another Win PC? Is there any way to bind the drives together so that the RAID setup stays, even after changing motherboard/cpu? ...
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Linux: How to confirm bad ATA device? [duplicate]

dmesg listing this error string 14 times consecutively: [ 799.496637] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 [ 799.496683] ata4.00: BMDMA stat 0x4 [ 799.496710] ata4.00: failed ...
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33 views

Raid0 Test For Multiple Partitions On A Single Drive Gave Better Sequential Write Speeds That Expected

Obviously running raid0 on partitions of a single drive will result in a performance decrease; data has to be written/read multiple times to/from the same drive, and because of how it's spread the ...
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1answer
100 views

Boot partition for Software RAID 1

According to this tutorial: http://edoceo.com/howto/mdadm-raid1 as well as the answer to this question, ...it is necessary to create a separate boot partition if you want to boot from a software ...
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1answer
25 views

Does RAID1 really protect me?

I have 2 drives mirroring each other. They are pluggable and occupying 2 SATA slots. Totally I have 5 SATA slots. Can I freely unplug RAID parts and then plug them back and have data intact? If not ...
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With a the built-in Windows software-RAID1 mirror, what procedure does Windows follow on an unreadable sector?

For modern retail hard drives, the Unrecoverable Read Error (URE) is around 1x10E14 bits. This translates into one bad sector for every 12 terabytes of data read. For enterprise class hard drives, its ...
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1answer
68 views

Cloning md partitions for recovery

I have a failed software RAID5 (3x500GB disks) that I'm trying to recover. I don't want to try some of the more risky steps on the actual disks, so I want to clone them to new partitions on a new 3TB ...
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36 views

Raid Configuration lost After For Installing Windows/Formatting Hard Drive on reboot

My boss recently got a tower fujitsu server, I dont know the model because it is written in Chinese. I installed windows server 2012, activated hyper-v and even installed ubuntu as a VM and ...
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1answer
245 views

Laptop offers RAID option - how does that work?

I am in the market for a new laptop. I'm looking at the Dell M6800 and HP ZBook 17. Both of these laptops can be configured with a RAID 0/1/5 option. Is this hardware RAID or software RAID? I have ...
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41 views

BTRFS multiple devices mix raid1 and raid0

Hi Consider the following use case: I have two disks same size (let's say 3TB each). Then create a btrfs filesystem using both devices. Now I want to have two subvolumes "idata" and "ndata". Where ...
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1answer
59 views

move mdadm raid to new system

Have a 4-drive Ubuntu mdadm raid in a system whose motherboard (ASUS N1996) failed permanently. I tried putting the 4 drives in another system with a different motherboard, but when it came up it ...
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1answer
32 views

Add space from 3TB unto 4TB using raid, how?

I would like to expand my 4 TB drive by adding on drive space from my 3 TB drive. I assume this is possible in a raid configuration by resizing the partion on the 3 TB to free space then using ...
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1answer
86 views

MDADM RAID-0 does not increased size after grow on AWS Linux with EBS

I wanted to grew a Raid0 from 2 disks to 3 (each 1TB EBS on Amazon AWS) but the size did not change thereafter. The RAID started with two disks sdc and sdd and the new one was sdf. Here is the ...
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509 views

Where is the software RAID information actually written?

Like title says, where is the actual information which specifies which disks are being used, what order, etc...? I noticed while installing a linux distro that it was detecting a RAID array without a ...
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19 views

Moving software RAID to Linux

I'm using a RAID 1 (mirrored pair) configuration in my Media Center/ NAS system. Currently it's running Windows 8 (yeah, big mistake I know) and I'm regretting it (did it for the games, not worth it). ...
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2answers
241 views

New mdadm RAID vanish after reboot

I have problems with mdadm after reboot, I can't reassemble /dev/md0 . I work on debian wheezy. I have done the following steps:: sudo mdadm --create --verbose /dev/md0 --level=6 --raid-devices=4 ...
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1answer
41 views

What is the best way to create RAID 1?

I'm looking for a way to create the RAID 1 array without losing my data on CentOS. Here's my situation: I've got a web server running on CentOS. There is one VG partition with few LV volumes. I bought ...
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1answer
77 views

Software RAID 0 under Window 7 on 2 HDD only (including system drive) - is it possible

I have two hard drives in my notebook. I cannot add third drive. Is there a possibility to somehow set up software RAID 0 (striped) under Windows 7? My notebook does not support hardware RAID 0. I ...
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1answer
77 views

Recover LVM with software raid

I have a Synology NAS using SHR mode, which is basically LVM and Raid 5. Somehow my LVM volume became corrupted and won't mount anymore. This volume houses over 20TB of data, and most of it is NOT ...
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107 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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73 views

windows server 2012 span multiple raid 5 arrays

I have some old hard disks that I want to get as much out of them as possible for space. Currently, I have: 2 x 200 GB HDD 2 x 500 GB HDD 2 x 1.0 TB HDD 1 x 1.5 TB HDD If I combine them as ...
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139 views

Ubuntu 14.04 RAID10

I got Ubuntu 14.04 (recently upgraded from version 12.04). Under this system I got a software RAID10 build with 4 drives (WDC WD20EFRX-68EUZNO) near=2 layout. After the upgrade to newest Ubuntu LTS ...
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65 views

Virtual Disk Service Error: The plex type is invalid

I have windows 7 ultimate x86 on an older Dell Precision 530. I had 3 80gb drives laying around. So I have them in diskpart in windows 7 setup via Shift+F10 and I see 3 74gb drives. I cleaned all of ...
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2answers
112 views

Restore RAID 0 storage volume after Windows 7 re-install?

I have a RAID 0 storage volume in Windows 7 with 3 disks and I want to re-install Windows to the OS drive. If I do this, will Windows recognize the previous RAID array and configure appropriately? ...
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1answer
141 views

Can I pass disks through Hyper-V to a Linux VM for md RAID on any hardware?

I toyed with the idea in the past few months of virtualizing a workstation machine (with ESXi/Xen/etc), basically having it run some very basic server stuff behind the scenes; this was more of an ...
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1answer
45 views

How to avoid rebuild of soft-RAID at boot-up

I have here a serious problem on my home server: I have a LVM on a RAID5 array. As memory ran short, I decided to enlarge the RAID array (and later the PV+VG+LVs). So far so good. I stopped the ...
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142 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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30 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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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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104 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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1answer
377 views

Synology disk group

For the moment i've 1 4TB HDD on my synology DS1513+. I'm transfering all my data on it but when this HDD will be full, i'll add a second 4TB HDD. How to have 1x8TB and not 2x4TB on my synology ...
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36 views

Build one logical drive from hdd and ssd drives (with a tweak!)

How is it possible to build one logical drive in linux from two physical drives, hdd + sdd with the below rules: All writes are replicated to both drives (Kind of RAID 1). All reads are only ...
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1answer
77 views

Software RAID 1 Configuration

I have created a software RAID 1 quite some while ago and it always seemed to work for me. However I am not completely sure that I have configured everything right and do not have the experience to ...
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91 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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75 views

How to set boot disk after disabling mdadm raid 1?

I had two disks in raid 1. The device contained the whole system. Disabled it from a rescue disk with: (there were three partitions) mdadm --stop /dev/md1 mdadm --stop /dev/md2 mdadm --stop /dev/md3 ...
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138 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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1answer
119 views

Can I move a RAID drive to another Sata port?

I currently have a Windows Server 2008 R2 machine with 4 x 1TB drives in software RAID5 controlled by WS 2K8. I am planning to upgrade to 4 x 3TB in the same software RAID5. Clearly 8 sata ports (9 ...
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218 views

Redundancy: LVM+mdadm or LVM internal RAID

The task is to create LVM storage for virtual machine images. So LVM will be used in any case. There are two ways LVM providing redundancy: block mirroring lvcreate -m 1 --mirrorlog mirrored -n ...
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28 views

Windows Software RAID recovery after non-RAID drive failure

This is a hypothetical question but first some context. I'm looking at setting up a simple RAID 1 (mirrored) for storing data. I was looking at using Windows Disk Management tools on a Windows 7 ...
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1answer
36 views

How to handle a Linux software RAID when one drive has a hardware failure?

I have a server that has two internal hard drives. What happens when one drive has a hardware failure exactly? Does it send an e-mail message to root to get your attention? When it has been ...
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1answer
74 views

Hardware RAID vs. Software RAID [duplicate]

What is the big difference between software RAID and hardware RAID at the low level? What is really going on that sets the two apart? As far as I know, the only difference is the RAID card can have ...
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771 views

Does windows 7 disk manager mirror disk or partitions?

My servers Raid 1 disappeared when I did a bios update, And now in order to get it back I have to format my 2 * 3tb hard drives. Which isnt really a solution for me. So I have desiced to try and make ...