RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

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Why does my RAID 1 NAS have to “synchronize”?

I have a new QNAP TS-451 NAS with two new 3TB drives, installed as a RAID 1 pair. As I copy data on to it, it seems to spend the next few hours "synchronizing" the RAID group. (The web console shows a ...
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276 views

installing Centos 7 and configure RAID 10

I had a system with 4x500GB HDD and a 16GB pendrive. I would like to build a homeserver with RAID 10. Currently i use nas4free. But i am planning to setup a local file server as well as a webserver. ...
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1k views

HP Microserver Gen8 (Intel Celeron G1610T) with Ubuntu Server 14.04?

I'm looking for a small home server working with Ubuntu Server 14.04. I want to install SAMBA and a UPNP streaming server on it. I found this small HP Proliant Microserver with an Intel Celeron G1610T ...
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57 views

Pegasus R6 Thunderbolt raid with CentOS 6.5

We have ourselves a rather expensive Mac Pegasus R6 external thunderbolt raid and a CentOS box that we would love to use it. On a Mac it's plug and play, however on our CentOS box it's not recognized ...
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102 views

An existing mdadm RAID5 is not mounting, Either a problem drive or Superblock

I have 4 x 3TB NAS setup as RAID5 which has been working great for almost a year. After a recent abrupt shutdown (had to hit the power button) the RAID will no longer mount on boot up. I've run: ...
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2answers
51 views

Are RAID formats compatible across distributions?

I'm planning a NAS/home media server build, probably with a HP Proliant Microserver. It will probably have two HDDs in RAID 1, while the OS while run from a USB drive. Question is: once I've set up ...
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64 views

Backup and restore of raid1 device, after OS upgrade

We have a physical RedHat server with two 60GB local disks, and two RAID 1 devices on them. There are also a few multipathed SAN luns. Disk /dev/sda: 60.0 GB, 60022480896 bytes Device Boot ...
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60 views

BTRFS - Raid incomplete after balancing

I have two 3TB drive that are formated as btrfs and mounted on /media/andy/btrfs as one drive. I run btrfs balance start -dconvert=raid1 -mconvert=raid1 /media/andy/btrfs/ which takes forever. It ...
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1answer
536 views

RAID-1 doesn't Assemble, elements listed as SPARE, how to recover?

I recently moved my Kubuntu 12.04 workstation to a new location. It was shutdown normally but when I rebooted it in its new home the RAID-1 array /dev/md0 was GONE! The Elements of the array are ...
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2answers
83 views

Raid 5 not starting

I had a raid 5 with 3 disks in my old computer, but the motherboard died. I put all the disks in a New computer, but the raid doesn't want the start anymore. When booting the pc, i can see all ...
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1answer
656 views

mdadm RAID 5 and parted unrecognized disk label

I have three 3 TB drives that I am attempting to put together into a RAID 5 setup with mdadm, but I am running into some issues. (Actually, I have four 3 TB drives I will be using, but one of them ...
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39 views

Mdadm not adding all disks to raid

A couple of years ago, I installed a raid 5 with mdadm on a fedora box. The old hardware died recently, and I have put the boot disk in a newer desktop pc, and added the thee raid disks via usb. So ...
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1answer
214 views

vPrevent Debian from auto-assembling raid at boot

I set up a Debian wheezy (7.6), installed openmediavault, and created a software raid 5 with that. It is listed at /dev/md127. Now I want to move that to a virtual XEN VM. To do so, I have to stop ...
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3answers
93 views

Software RAID10 setup writes small files extremely slowly, is this normal?

I have a software RAID-10 setup on Linux 3.16.6-203.fc20.x86_64, with 1.2 metadata and the default chunk size (512K): $ cat /proc/mdstat md0 : active raid10 sdc1[4] sdb1[0] sdd1[2] sde1[3] ...
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1answer
2k views

Grub fails to install - Debian Wheezy with mdadm RAID1 and GPT partition table

I've been trying all day to get my new Wheezy install completed but it fail to install Grub every time. I'm using x64 netinstall iso. Here is my partition table: Model: ATA ST3000DM001-1CH1 (scsi) ...
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1answer
53 views

mdadm - What's the difference between --detail --scan and --examine --scan?

From man mdadm: -E, --examine Print contents of the metadata stored on the named device(s). Note the contrast between --examine and --detail. --examine applies to devices which are ...
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282 views

btrfs balance fails due to enospc error

[taken over from stackoverflow since I figured that was probably the wrong place] I am currently testing btrfs as a possible replacement for my NAS running ZFS. I created 4 devices, 20GB each, and ...
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26 views

Files and Directories Dissappearing from Software Raid on Power Failure

I have a home samba file "server" (a raspberry pi) with two hard drives in a software raid 1, which have proven less reliable than any of my non-raid disks. I know there is a chance for data ...
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2answers
166 views

Spanning RAID over SSD and Mechanical HD

Currently I have my root (/) directory on my ssd, and my home directory on my mechanical drive. Wanting to utilize more of the ssd and hopefully get a speed benefit, I was considering spanning across ...
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1answer
58 views

File transfer between SSD and RAID array uber-slow

It's really simple: this server has an SSD for the main drive, and a RAID array (mdadm) for storage. Intermittently, it has a problem writing to the array: the write speeds slow down to the point ...
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2answers
44 views

Whose responsibility is to divide data into PEs or chunks?

When we create LVMs or the RAID partitions, the data we save in the parition is divided into PEs or the chunks respectively instead of the conventional blocks of ext3 or ext4. My doubt is whose ...
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1answer
343 views

A SparesMissing event had been detected on md device /dev/md0

I'm getting the following mail every day on a server: This is an automatically generated mail message from mdadm running on <host> A SparesMissing event had been detected on md device ...
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58 views

server can't read newly installed centos 6.1

I have a server that has 12TB and I used RAID 1+0(RAID 10) so my logical drive in the server is now 6TB + (6TB Mirror) when I install the CentOS v.6.1 in the server, the installation has no problem at ...
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52 views

Linux SW RAID and physical volumes

In each guide about software RAID in Linux, I could find online I see that people usually create/assemble RAID devices using partitions, like: mdadm --create --verbose /dev/md0 --level=5 ...
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824 views

How to combine multiple HDDs into one big HDD in Linux?

I'm very new to Linux, being mainly a Windows 7 user, so I may not understand Linux-specific commands without explanation. I've decided to build a NAS running some form of Linux (probably FreeBSD or ...
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1answer
2k views

How to install Debian Jessie properly onto multiple devices with BTRFS in mode RAID 1?

As a short introduction I'm going to tell you, what kind of setup I have and what I want to achieve. After that I try to explain my problem. Since this is my first question on U&L I have to ...
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665 views

How to make Intel fake RAID 0 volume appear on boot with Ubuntu 14.04 in a multi-boot environment?

I have a computer with a Gigabyte GA-Z97N-Gaming 5 mainboard, a 256 GB drive for booting and two 3 TB drives meant to use in a RAID 0 setup with both ext4 and NTFS partitions. We are planning running ...
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1answer
36 views

Is there anyway to get the hardware information on a hardware RAID 1 while inside of the OS?

Is there any way to see the information on a hardware raid while still being in the OS? Things to note: I am remotely connected to this machine (so I cannot physically see the information of both ...
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1answer
151 views

If MBR is broken, how to fix on RAID + LUKS encryption?

Problem: After HDD failure in a Software-Raid Mirror Debian does not boot. Only black screen with blinking _ Debian Setup: Within the raid I have a complete system encryption with luks. I am not ...
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1answer
158 views

Raid 5 rebuild with wrong stripe size & no failed disks - is data lost?

I'm curious if there are hidden complexities to RAID5 and RAID5 rebuilds. My understanding is that (in a 3 disk array) a rebuild would just directly compute the parity of disks 1 & 2 and write ...
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433 views

What are the steps needed to get Redhat/Centos 7 to boot from an mdadm RAID?

I've spent a day on this. Figured it was time to ask. In the end I couldn't get around "Bad magic number in super-block ..." On an average install, my sda exits setup as an EFI. I'm cool with that ...
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1answer
125 views

XFS on Volume Group or Mdadm Raid 0

Im starting to use XFS because I want to create a highly parallel disk array and experimenting on just 2 drives for now. I had thought that if I used a logical volume group to join two physical ...
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1answer
376 views

Why is so much of my new ext4 filesystem already marked as used?

I have just created a new raid 5 array using 3 4TB drives (aiming for 8TB of space) on an ubuntu system. While I had a few issues getting started, I believe I have set it up correctly and I have ...
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286 views

How to write to RAID 1 disks on Raspberry PI

I'm using Arch Linux on my Raspberry Pi, though I'm not sure that's relevant. I followed this tutorial to set up a RAID 1 array with 2 USB HDs. I then mounted the array (md0) in /media. What I ...
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1answer
70 views

Moving software RAID 1 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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1answer
147 views

chroot into system

Update : Following the advies of slm, I could destroy the RST raid 0 and create a new raid0 using mdadm using the webpage he gave me. I could start the installation but at the step where grub is ...
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2answers
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RAIDing with LVM vs MDRAID - pros and cons?

In his answer to the question "mixed raid types", HBruijn suggests using LVM to implement RAID vs the more standard MDRAID. After a little investigation, it seems LVM also supports RAID ...
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41 views

Discovering possible RAID configuration of a bunch of disks

I have a stack of 8 disks which were at one point all inside of one host. That host no longer exists, but it's been requested that I retrieve data from these disks. No one can tell me anything about ...
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1answer
92 views

Clone installed system by using the hardware RAID 0+1 synchronization

Alright, following setup: 2 identical machines (DELL Power Edge T320) with a hardware raid. one machine is running for a while now, one machine hasn't even been set up at all The running machine ...
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1answer
62 views

RAID Level 5 versus Level 1

Is it slower to write one block in RAID Level 5 with 5 disks than RAID 1 with two disks (mirroring only)? I think No since with Level 5 you are writing the data and the parity (two writes). With Level ...
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1answer
180 views

Recover data from raid 1 when both drives are faulty

I had a RAID 1 on my server, and apparently both of hard drives have failed at the same time. Server support did a quick check to confirm that HDDTEST-W1F21M6K ERROR Finished (Selftest, Device: ...
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2answers
224 views

mdadm metadata: should i take precautions to prevent superblock overwrite?

Situation: I'm creating a new RAID1 array using mdadm. I won't be using additional layers, such as LVM or dm-crypt. I've noticed that metadata version 1.2 is now the default. I understand it's the ...
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2answers
9k views

mdadm raid doesn't mount

I have a raid array defined in /etc/mdadm.conf like this: ARRAY /dev/md0 devices=/dev/sdb6,/dev/sdc6 ARRAY /dev/md1 devices=/dev/sdb7,/dev/sdc7 but when I try to mount them, I get this: # mount ...
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1answer
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Recovering a (not yet created) RAID5 with URE (Unrecoverable read errors)

I wan't to create a RAID5 array at home, the OS is Linux (Kernel 3.15.7) and the array will be created with mdadm. I wan't to create the array with eigth or ten 1TB discs. Let's assume a single drive ...
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4answers
518 views

Reassemble mdadm-raid5

A friend of mine has a mdadm-raid5 with 9 disks which does not reassemble anymore. After having a look at the syslog I found that the disk sdi was kicked from the array: Jul 6 08:43:25 nasty ...
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1answer
178 views

RAID-1 mirror has become a single hard disk

I have an HP N40L microserver, with 2 identical drives, I used the system to hardware-RAID them as a mirror. I then installed mint on the system about a year ago. This has been running perfectly, ...
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141 views

how to reverse the effect of sgdisk -R=/dev/sdb /dev/sda?

I accidentally used sgdisk -R=/dev/sdb /dev/sda instead of sgdisk -R=/dev/sda /dev/sdb after replacing a broken drive in a raid. Can I recover from this or is all data lost now?
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23 views

Is it reliable to assemble md from two machines at the same time

Say we have the same disks accessible from two machines. I want to do assembling md from two machines. Is it possible/reliable ? The disks are connected through SAS. All I need to have is reliable ...
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89 views

Moved Raid from NAS box to PC running Ubuntu hdparm shows drives frozen

So I had a RAID5 setup in a Partriot S4 Javelin (a NAS box). I'm now migrating it to a proper server running Ubuntu 14.04. NOTE: There are 4 drives. All the drives show up in Ubuntu. Two show ...
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How to increase an FS using a LiveCD - that has SW RAID+LVM

If we have an older OS and can only increase the FS if we umount the FS because it is the ex.: /usr - then we have to use a LiveCD. The /usr is in the rootvg (LVM) that is on a SW raid Q: What are ...