5
votes
1answer
419 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 ...
0
votes
0answers
14 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). ...
0
votes
0answers
25 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 ...
0
votes
0answers
31 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 ...
0
votes
1answer
30 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 ...
0
votes
0answers
19 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 ...
0
votes
0answers
14 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 >> ...
0
votes
0answers
79 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: ...
0
votes
0answers
28 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 ...
0
votes
1answer
64 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 ...
0
votes
0answers
41 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: ...
0
votes
0answers
48 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 ...
3
votes
0answers
60 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. ...
1
vote
0answers
46 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 ...
0
votes
1answer
25 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 ...
1
vote
0answers
88 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 ...
0
votes
1answer
70 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 ...
0
votes
0answers
14 views

Ubuntu boot through failed RAID

I have a large media partition as a separate RAID5 on my Ubuntu server. The server is not easily accessible, so I need it to continue the boot process in all but the most dire circumstances. Right ...
0
votes
0answers
108 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 ...
1
vote
0answers
26 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 ...
0
votes
1answer
47 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 ...
0
votes
1answer
38 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 ...
0
votes
1answer
79 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 ...
0
votes
1answer
94 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 ...
0
votes
1answer
81 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 ...
1
vote
1answer
356 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 ...
0
votes
0answers
60 views

Recover Truecrypt-encrypted software-RAID5 (maybe overwritten superblock)

I updated some parts of my fileserver and installed the latest Debian version. It detected the mdadm raid, but marked the array as 3 active devices and 1 spare device. I thought this was wrong and I ...
0
votes
0answers
64 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 ...
1
vote
0answers
850 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 ...
0
votes
1answer
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 ??
0
votes
0answers
183 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 ...
1
vote
1answer
158 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 ...
0
votes
1answer
124 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, ...
1
vote
1answer
283 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
1answer
467 views

Assembling an mdadm array with “possibly out of date” disks

I've recently moved house and have had some power problems after switching on my file server that's using a mdadm RAID5 set up. The file system I'm using is ext4. It seems that at some point two (of ...
1
vote
0answers
340 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
2answers
189 views

RAID on partitions or devices

I plan to create a software-only Linux MD RAID10 array from two identical 1TB discs (using mdadm). Should I create it directly on the two disc devices (/dev/sda and /dev/sdb) or create a partition in ...
1
vote
0answers
112 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
222 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
179 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). ...
0
votes
2answers
68 views

Writing to a specific drive with software RAID4 on Linux

Edited to reflect conclusions from comments: I want to construct a software RAID-like array with 2 storage devices plus one parity device, where the parity device maintains the XOR of the two other ...
1
vote
1answer
268 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 ...
3
votes
2answers
12k views

How do I reactivate my MDADM RAID5 array?

I've just moved house which involved dismantling my server and re-connecting it. Since doing so, one of my MDADM RAID5 arrays is appearing as inactive: root@mserver:/tmp# cat /proc/mdstat ...
1
vote
1answer
113 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 ...
2
votes
0answers
499 views

mdadm RAID monitoring no DegradedArray email

So, I have a couple of MDADM RAID arrays and I want to set up monitoring with email notifications for drive failures through sSMTP but I can't seem to get it working. The system in question is a ...
2
votes
1answer
89 views

Why make a partition at all for mdadm/raid?

i have 4 disks, sd[a,b,f,g] of various sizes that I want to 'merge' together. I am using mdadm to achieve this. my question is, what's the difference between -- mdadm --create /dev/md0 ...
1
vote
0answers
55 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 : ...
2
votes
2answers
53 views

Is it possible to migrate a software RAID5 array to RAID0?

So last year I helped my father in France set up his Office machine with a RAID5 array of 3 identical 1TB drives (for a combined space of 2TB). Last week one of the drives died, he's using the machine ...
1
vote
0answers
455 views

Unable to reassemble md raid on drives pulled from ReadyNas Duo v1

I'm toying with a ReadyNAS device that I've recently acquired. It is a SPARC-based box, and it runs linux. As device is pretty slow, I've pulled one drive out of array, hoping to populate it with ...
2
votes
1answer
13k views

How? Mount, Find & Recover DATA in HDD outside of Synology Box

How? Mount, Find & Recover DATA in HDD outside of Synology Box I had originally posted this question here on Synology Forums and no real solution was suggested except a Linux / RAID based ...