Questions which refer to software RAID implementations.

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262 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
160 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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175 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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138 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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187 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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107 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
222 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
247 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
59 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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232 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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34 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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21 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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129 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
643 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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38 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
84 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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127 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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82 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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0answers
195 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
196 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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277 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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32 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
38 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
100 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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1answer
1k 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 ...
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147 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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1answer
188 views

CentOS Gnome only showing 1TB on 6TB Server?

I just bought a new server and want to use it to store files, It has 2x 3TB hard drives. I Set them up in raid 0 as i don't need any redundancy. I don't know much about servers and command-lines ive ...
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2answers
634 views

Is it safe to use Truecrypt to encrypt a raid 5 array?

I have a raid 5 array(software in windows server 2008). I have encrypted it using truecrypt, and it seams to be working fine, however, I am worried what will happen when i lose a drive. Will truecrypt ...
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1answer
118 views

Setting up a RAID 5 Array

I am currently trying to convert my drives from just a bunch of external disks, each one individually shared from my (CentOS) server into a RAID array (ideally, RAID 5). At current, my drives are: ...
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202 views

Hybrid Raid-1 HDD + SSD — Write Intent Bitmap

I am currently running a laptop with 1 HDD and 1SSD. I currently am using mdadm to put some partitions in a raid 1 configuration with --perfer-write set on the HDD. I have this working correctly ...
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1answer
47 views

Move two X-RAIDed disks to ubuntu

I have an old NAS (Netgear ReadyNAS Duo) that are X-RAID (Expandable RAID) that I need to move on to a new Ubuntu 12.04 Server. Assuming that this is software raided, does anyone know where I can ...
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1answer
1k views

Understanding /proc/mdstat [U_] VS [_U]

My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 ...
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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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1answer
81 views

LVM while mdadm is creating a RAID6

So earlier today I was setting up a new server and creating a RAID6 array with mdadm. I then decided to create a physical and logical volume with LVM while it was running and throw on ext4. So before ...
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66 views

Is it possible to create software Raid array with operating system partition included?

I know that software raid array can be created in the OS it self. But my question is, Is it possible to create a software raid array including partition which is having Operating System installed ? Or ...
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1answer
274 views

Recover software RAID

I built a RAID-1 with two hard drives using mdadm. Command used was: mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc it went fine, I create partition table and partitions in ...
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1answer
146 views

Linux software RAID 10 on mixed drives - alignment

I have 4 2.5" 7.2k drives lying about and I'd like to build some RAID arrays for a bit of VM storage on my KVM lab box. There are 2x 320GB drives and 2x 500GB drives. I'm looking to create a RAID 10 ...
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1answer
308 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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144 views

How can I change super-minor number of a software raid array meta 1.2?

I had a double failure while I was away on the holidays of my array. As I was saving the data, I created a new array on a new drive has /dev/md1 and copied the info from my almost failed remaing HD ...
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1answer
29 views

Is it possible to operate two RAID-0s alternately?

I have a software RAID-0 (two hdds) on a WIN7 machine that holds all footage of a video project. If I remove and store these drives and install two new drives as RAID-0 for another project, will I be ...
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1answer
585 views

How to create a software RAID-1 array on Windows 7 not spanning whole disks

I have a brand new PC dual booting out of a single SSD drive (win7+debian). I added a couple of 2T hd I want to use from both Win & Linux. My target is to have two separate RAID-1 arrays on four ...
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1answer
2k views

Windows Dynamic Disks vs BIOS FakeRAID

I have two 3TB disks in a Windows 7 Dynamic Disk Mirror array (effectively, software RAID1). Apart from being tied to the O/S (I can't mount the array in Linux, for example) - is there any difference ...
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1answer
233 views

Repair partition table for disks in a RAID1 array

Here's my problem. I have several arrays. RAID1. I've scanned each drive that's part of an array with gdisk and it reports problems. One array (2 drives) has a damaged GPT partition table and a ...
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75 views

linux mdadm: recover overridden array

I had 2 3TB disks in a RAID1 array as /dev/md2. I tried to recover that array, by recreating it (which was probably stupid). I issued mdadm --create /dev/md2 --assume-clean --raid-devices=2 ...
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SDcard /dev/sdb2 is apparently in use by the system; will not make a filesystem here

I divided my sdcard into 2 partitions, but It got an error and couldn't create a new partition. Error: /dev/sdb2 is apparently in use by the system; will not make a filesystem here! My ...
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35 views

Linux software raid [duplicate]

I want to know if I used software raid on Linux for a non system disks (raid 5 as example),then I lost the system for any reason ! can I restore the data on the raid after a fresh installation ??
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2answers
137 views

Use the speed of an SSD + two HDD in RAID 1

Is it possible to gain a speed benefit of an SSD if you create a software raid with a big SSD + two smal HDDs? At the moment I have a system with only two 320GB HDD. And I thought about inserting a ...
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321 views

Power loss during mdadm RAID level change

As per the title, my mdadm RAID was in the process of migrating from level 6 to 5 when the power cut out momentarily. Unfortunately I am no longer able to reassemble the array - the assemble command ...
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1answer
218 views

Trying to Narrow Down a Disk Error

I've been experiencing some weird errors from some hard drives, and I'm having trouble narrowing down the problem. It's part of a RAID array (Linux software RAID, budget hardware), so when it dropped ...
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1answer
201 views

Adding sda1 vs. sda to a linux software raid

I'm running a Linux md software RAID 6 on several USB hard-drives. Each drive is partitioned to contain one partition of type fd (linux raid). My RAID is built on these partitions, i.e. it uses sda1, ...