Questions which refer to software RAID implementations.

learn more… | top users | synonyms

1
vote
0answers
139 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 ...
1
vote
0answers
56 views

Raid0 recovery - failed mobo

Short story: motherboard died, need to recover data from 2 working HDD's in RAID0 Long story: My mobo died on a Dell Studio XPS 7100, I basically upgraded all the components and my pc is now up and ...
1
vote
0answers
51 views

Is a btrfs RAID1 mountable if the added device isn't available/offline/failed/degraded?

Assume I created a RAID1 with btrfs's functions (btrfs device and btrfs balance subcommands instead of mdadm) like so: btrfs device add /dev/sdxZ /dev/sdxY btrfs balance start -dconvert=raid1 ...
1
vote
2answers
243 views

Cloning a Linux software RAID and LVM setup to another computer

I need to create a number of (almost) identical Linux machines (Debian Wheezy) with software RAID and LVM. I'm thinking of creating a base installation and cloning that one to all machines. I tried ...
1
vote
0answers
54 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, ...
1
vote
1answer
64 views

MDADM RAID5 recovery, refused to add replacement disk

I dealing with a faulty raid5 setup (3x2TB disks): Number Start End Size File system Name Flags 1 1049kB 1026MB 1024MB ext3 primary 2 1026MB 6146MB ...
1
vote
0answers
61 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 ...
1
vote
2answers
500 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 ...
1
vote
1answer
279 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 ...
1
vote
1answer
275 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 ...
1
vote
0answers
335 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 ...
1
vote
0answers
213 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 ...
1
vote
0answers
422 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 ...
1
vote
0answers
47 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 ...
1
vote
0answers
185 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 ...
1
vote
1answer
63 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 ...
1
vote
0answers
45 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 ...
1
vote
0answers
2k views

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 ...
1
vote
1answer
269 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 ...
1
vote
1answer
549 views

RAID 5 degraded performance

I'm currently rebuilding my fileserver, but because of SATA port limitations, I can only use 5 disks at a time. I've remove a drive from my original RAID, so I've been able to create a new degraded ...
1
vote
0answers
728 views

md0 RAID1 can't read superblock

i have a problem with my md0 array, which is an raid1 (2 mirrored USB-Sticks) Mount gives "Can't read superblock" cat /proc/mdstat: Personalities : unused devices: <none> fdisk -l ...
1
vote
0answers
50 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 ...
1
vote
1answer
268 views

Windows Software RAID: How can I view the Windows RAID parameters (disk signatures, etc.)?

The software RAID array in my Windows 7 x64 box failed. Drive tests report the drive itself as healthy. Two drives, RAID1 partition and one RAID0 partition. In Disk Manager, the failed drive shows up ...
1
vote
0answers
175 views

Is `dmsetup remove` safe with respect to contained data?

I have a "lost" SW RAID array as described in this question: http://askubuntu.com/questions/311024/raid1-array-lost-after-upgrade-from-ubuntu-11-10-to-13-04. I have now identified a way to mount one ...
1
vote
1answer
637 views

Documentation for mdadm bad block support

I've read a bit about that mdadm (and the kernel) now have bad block support but I am having a hard time finding any useful documentation on this subject. Is the bad block list for disk X duplicated ...
1
vote
0answers
320 views

Upon reboot, Linux software raid fails to include one device of a RAID1 array

One of my four Linux software raid arrays drops one of its two devices when I reboot my system. The other three arrays work fine. I am running RAID1 on kernel version 2.6.32-5-amd64 (Debian Squeeze). ...
1
vote
0answers
133 views

Difference in Storages Spaces feature between Windows 2012 Server & Windows 8

So here it goes, I have a test bed setup, a machine with three harddrives besides the OS drive and installed on this machine is Windows 2012 Server Standard. I have the following Storage Spaces ...
1
vote
1answer
481 views

Restart degraded RAID array after crash

I've had to (temporary) reduce my RAID5-Array, so that there are four out of five disks available. Things getting worse as my system crashed during write process. After reboot the system wants to ...
1
vote
1answer
185 views

Resume mdadm array build after power outage?

I was building a 2tb x 4 disks using mdadm. Originally mdstat said it was going to finish in 48 hours but unfortunately at 47 hours a power outage came into play :-) So I decided to zero out the ...
1
vote
0answers
62 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 : ...
1
vote
1answer
272 views

how to boot without assemblying raid arrays (or assembling them correctly)

I had one debian 6 system with two harddisks on raid1 set up via mdadm. built on simple partitions (/dev/sdb3, /dev/sdc3). at least on the old system, everything is tied up via UUIDs. then i inserted ...
1
vote
0answers
349 views

Windows 7 : soft RAID1 and dynamic volumes reliability

My setup is quite classic nowadays : 1 SSD for system/apps and 2 HDDs for data setup in a fake RAID1 array. I also have a backup scheduled every week for the data drive in case it fails because I ...
1
vote
1answer
1k views

Take one disk of external mdadm data raid 1 to travel

I have a mdadm software raid 1 on external disks with media data. For travel I want to take the data with me. I imagine to set the raid and the underlying filesystem in readonly mode and take just ...
1
vote
1answer
112 views

RAID 1 : one device reads while the other writes symmetrically. What is going on?

Take a look at the disk throughput of this two disk software RAID 1 array in a Linux 2.6.26-2-686 Debian system : As you can see, one device reads at a speed apparently close to its top throughput ...
1
vote
0answers
2k views

Linux - Repairing bad blocks on a RAID1 array with GPT

The tl;dr: how would I go about fixing a bad block on 1 disk in a RAID1 array? But please read this whole thing for what I've tried already and possible errors in my methods. I've tried to be as ...
1
vote
0answers
1k views

mdadm raid5 read error not correctable

I have a software raid5 setup existing of 4 disks. sda, sdb, sdc, sdd Since everything was up and running I wanted to test the array. To do this I pulled the plug on one of the disks (sdd). Everything ...
1
vote
1answer
1k views

degraded mdadm RAID5 array

My /dev/md0 array just died last night. I got this email This is an automatically generated mail message from mdadm running on A Fail event had been detected on md device /dev/md0. It ...
1
vote
1answer
772 views

CentOS - mdadm raid1 drive won't mount to default location

I'm running CentOS 5.5, the system, boot, swap, etc. is all on /dev/sda and I have two identical single-partition drives /dev/sdb1 /dev/sdc1 that are configured in RAID1 (using mdadm). It was working ...
1
vote
1answer
894 views

Recover Linux software RAID5 array after server upgrade

I recently upgraded a server from Fedora 6 to Fedora 14. In addition to the main hard drive where the OS is installed, I have 3 1TB hard drives configured for RAID5 (via software). After the upgrade, ...
1
vote
1answer
484 views

Adding disk to windows-7 RAID-5

If I have a 3-disk RAID 5, and I want to add a 4th disk to the RAID, can this be done without moving all the data out of the existing raid array and rebuilding it as a 4 disk raid-5 array?
1
vote
1answer
1k views

Can't boot system with raid1

I installed ubuntu server 10.04 on a PC with two HD drives 500 GB each. I used raid1 to provide data protection. After the installation has completed, the system did not boot properly. I got the ...
1
vote
0answers
585 views

proper procedure to repair RAID 1 volume in Windows Server 2008 R2

I'ave a windows server r2 with the following configuration 500mb SATA for OS 2 x 1TB SATA in Software Raid 1 (done through the operating system) One of the 1TB drives are bad. What will happen ...
1
vote
2answers
468 views

Re-Initialize RAID-0 in software after card failure

I'm working on a Friend's WD MyBook "1TB" HDD that is not mounting. When I got in to it, I discovered that it is really 2 500GB HDD's set up as RAID-0. It appears that the drives themselves are ...
1
vote
2answers
402 views

looking for a solution for a Software Raid on my XP computer

Recently, I purchase 2x1TB drives for my XP computer, I want to use RAID 1 for the redundancy, but the motherboard is little old and can't support that. Some articles introduce how to make it happen ...
1
vote
1answer
533 views

raid 1 + OS drive windows 7 ep45 ud3p

I have an existing drive with my OS and data on it, because of shortage of storage, I bought two Samsung 2TB drives to form a RAID 1 configuration. I understand that RAID 1 is a redundancy config. - I ...
0
votes
3answers
5k views

Software or Hardware RAID for Home Server?

Now I have searched Server Fault and Super User and have seen that some people recommend software and some people swear by hardware RAID, but I am looking to use it on a home server of mine to store ...
0
votes
2answers
2k 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 ...
0
votes
2answers
160 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 ...
0
votes
1answer
43 views

Old Raid pops up and destroys everything

I have a root server with a mdadm two-disk raid 0 on Ubuntu. One HDD failed and I continued to work on the second. The server hoster somehow repaired the defect HDD and after a server restart it was ...
0
votes
2answers
1k views

FreeNAS RAID5 Server - CPU Choice

What factors should you consider when choosing a CPU for a FreeNAS server? What are the implications and limitations based on CPU in this context? Currently I'm looking to build a FreeNAS server ...