Questions which refer to software RAID implementations.

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Running mdadm raid 6 with bcache layer on top. The raid had 6 drives in it and then an ssd for bcache

Output of /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : inactive sdd1[1] sde1[2] sdi1[5] sdb1[0] sdc1[6] sdh1[4] sdg1[3] 13673677416 blocks super 1.2 unused devices: This raid ...
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2answers
49 views

Mounting raid5 disks without one of raid's member

I have to read data from disks, which are raid5 members. I'm wondering if there is posibility to read data from those disks somehow, but one of those disks is just broken. I was trying to mount some ...
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Clonezilla and software RAID array theory

I don't have enough hardware to try this out myself, but since Clonezilla doesn't support backing up software RAIDs, I've been trying to think of ways to backup my RAID0. Since all of the information ...
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22 views

Need some more MDADM details

Short version: I am using a RAID1 with hotspare and I want to have a nightly DD ran to create a nightly image on a standby drive. All the drives are the same size/manufacture and local. I am getting a ...
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2answers
51 views

Expand a Linux MD RAID 10 array to use larger disks

From what I understand this is possible, but I can't find a straight answer anywhere about how exactly to go about it, and I don't want to risk losing data experimenting with it myself so I'm asking ...
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20 views

how do i shrink or reduce my raid array size

i have raid array md0 which is close to 5TB. i need to shrink this size so as to overcome the rebuild times when i test fail the drives. is there a tool/command that can help me to reduce the array ...
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12 views

RAID 6 Resync after system crash

I am running a home NAS server for data storage using linux (ubuntu) and RAID 6 configuration (using MDADM), however, occasionally the server crashes/hangs or experience a power-outage/interruption of ...
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10 views

Getting Event when RAID1 is failed

I have set up RAID1 using windows software RAID in windows 7. Is there anything registered in event viewer when RAID is failed?
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1answer
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Linux software Raid5 DegradedArray with mdadm

So I changed my case and I don't know why but one my SATA port does not work anymore. So only 5 of my 6 RAID5 disks were recognized. The volume was automounted anyway and I already wrote new files on ...
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15 views

mounting a RAID array on a machine with conflicting device name

I have a machine with the following RAID arrays connected: xxxx@xxxx:~$ sudo /sbin/mdadm --examine --scan ARRAY /dev/md/0 metadata=1.2 UUID=6c2e2072:4db41563:d93a9ae5:dfb29ffd name=xxxx:0 ARRAY /dev/...
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How I calculate XFS parameters for mdraid10,far/offset*?

I want to make a test by creating a bunch of partitions across some spinning hard drives, unite them with mdraid, and use XFS on that. But all guides I found assume you will use standard raid, or at ...
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md-raid1 with three mirrors became raid0 after removing one mirror while power off. how to fix it?

I create md-raid1 with three devices: mdadm --create \ /dev/md22 \ --level=1 \ --raid-devices=3 \ /dev/sd[a-c]2 and got nice raid mdadm -D /dev/md22: /dev/md22: Version : 1.2 ...
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1answer
20 views

Debian pvmove of root lv into raid10 device resulted in unbootable system

I was in the process of moving logical volume extents onto an raid 10 array assembled with mdadmin. One of the logical volumes moved was the root directory (debian testing system) which was previously ...
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1answer
12 views

Does rsyncing a Linux boot disk require any caveats to run off the copy?

The new server to run CentOS7 is on order. It will have a 60 GB SSD for CentOS 7 and four internal hard drives. The internal hard drives will run in a software RAID1 for three disk mirroring plus the ...
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1answer
19 views

Unable to assemble mdadm array due to lack of errors

My virtual machine host system is running Debian 8.4. I had to restart the system yesterday and did not yet manage to get my mdadm array up and running again. I can boot up normally, but no array (or ...
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131 views

Why does Dell PowerEdge T330 force hardware RAID for 8 drive configuration?

I'm considering the Dell PowerEdge T330 server tower to run CentOS Linux. The chassis configurations that can be ordered are either 4 3.5" hard drive slots or 8. We need to run a software RAID (that's ...
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1answer
59 views

Which RAID is easier to do recovery from, a software RAID or a hardware RAID?

I'm shopping for a new server and have been using software RAIDs. But I wondered about doing recovery on a hardware RAID vs a software one. I know with a software RAID you have to enter a series of ...
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57 views

Migrate from Windows 7 single HDD system to new system with RAID 1

I have a Windows 7 system with a single drive. It is regularly backed up to a system image on a USB drive. I'm building a new system with two drives that are bigger than the old system's drive. I ...
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2answers
42 views

How to make a three disk software RAID by adding the third disk?

The server is running CentOS and it has been successfully running a two disk software RAID. I wish to add a third disk to this for redundancy, so when one disk fails, the system still has two disks ...
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23 views

Debian Jessie, raid5 and encryption issues

I installed Debian 8 today. During installation, I made the following settings: /dev/sda1 -> 1GB /boot /dev/sda2 -> about 80GB encrypted device /dev/sda2_crypt -> lvm with VolumeGroup vg0 ...
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1answer
24 views

Is mixing software RAID disks across SATA and eSATA going to have any issues?

I have two eSATA drives running successfully in a software RAID on CentOS. I would like to make this a three disk mirror RAID by adding the third drive from the internal SATA drive. Are there any ...
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38 views

Will `tune2fs -E stride=X` have the same effect as `mkfs.ext4 -E stride=X`

The man tune2fs and man mkfs.ext4 state: stride=stride-size ... This mostly affects placement of filesystem metadata like bit‐maps at mke2fs(2) time to avoid placing them on a single ...
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1answer
46 views

Debian RAID drive size smaller than should be

Background So I am new to setting up a RAID, so bear with me. I have tried to set up a RAID 10 with 4 hard drives. I am using mdadm to achieve this. I have successfully made my raid as /dev/md0. I ...
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51 views

Are there any byte-level RAID standards, and if not why?

If you want data durability, you make backups. You might also want to use RAID to improve uptime, and to prevent online data loss. One can use software RAID, onboard/motherboard RAID, or a separate ...
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24 views

Windows 8.1 Storage Spaces Pool deletion

I am trying to delete my raid 0 storage pool and it seems that maybe the storage spaces utility doesn't recognize the pool being there. According to these screenshots (and others I have found that are ...
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1answer
166 views

Fixing a broken Raid-Array (Hetzner-Root-Server from Germany)

I do not know why but my Hetzner Root Server loses once a quarter its RAID array and the situation is different every time. This time I need further help. Maybe they want that I change to managed-...
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212 views

MDADM reshape really slow

To sum up : My raid reshape with mdadm is really slow. The complete story : 3 days ago I realized that one of my disks from a raid 5 array was faulty. I removed it and replaced it with a brand new ...
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39 views

Trying to use LVM, Software raid - Can't boot

I am currently on my 4th or 5th try to set this up, maybe you can help: I have an ESXI server, currently it only has a VM for PFsense, but I also want to put GitLab on it. Now, this is my first time ...
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1answer
54 views

Hardware or Software failure? [RAID5]

I have a raid5 system containing of 4 Samsung SpinPoint F4 Hard disks configured for auto spin-down after 20 Minutes. It is a Linux Software raid. Today I noticed that upon access to the network ...
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124 views

On ubuntu add a HD to RAID5 but the size do not Extension

In this time I have a RAID5 using three HDs(2TB*3) and I was tinking to Add a new HD and Extension the size to 6TB, The existing HDs is [adb][adc][add]=[md0] Then add HD is [sde] Wat I did is,,, # ...
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22 views

Is there a RAID mode that allows files to be on one physical drive of the array?

I am wondering if there is such a thing as a RAID mode (or similar implementation) that allows to physically split up files without redundancy across multiple, differently sized hard drives to form ...
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84 views

Strange software RAID performance results (on linux)

I have four 2TB 7200rpm hard drives that I want to configure as a software RAID array, using mdadm on linux (Ubuntu 15.10). I took this opportunity to explore the read/write performance of various ...
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13 views

Problems reassembling software RAID6

I have a software raid6 array (mdraid) consisting of 6 drives (/dev/sd[f-k] at the moment) at /dev/md1. Because I had to pull a different drive out of the machine (not one of the 6 drives), I ran ...
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20 views

To know hard disk failing in RAID 1

I have set up RAID 1 in windows 7 using disk management console. But I don't know if one hard disk is failed. I would like to get alert or message when one hard disk is failed in RAID 1. How can I do ...
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19 views

changing RAID hard disks

There are four hard disks in my machine. I installed window 7 in disk 1. I set up RAID 1 in disk 2 and 3 in disk management console. It is working well. But I would like to change RAID hard disk. I ...
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25 views

3 mirrored volumne in window 7

Can I make 3 mirrored Hard disk in window 7? I would like to use backup system(mirrored volume) with RAID 1 in window7. But the problem is that I can make two volume mirrored. Is that possible?
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48 views

Writing/reading data while rebuilding RAID array

I understand its best to limit disk activity as much as possible during a RAID rebuild/resync to reduce the risk of data loss and to prevent slowing down the rebuild process by adding more activity. ...
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3answers
414 views

Storage Spaces - removal of disk in Simple array

I have a simple array set up in Storage Spaces that consists of 5 hard drives: four are 3TB and one is 2TB. I want to replace that 2TB with a larger drive, but it has 40.1 % of the disk being used (...
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3answers
154 views

Software raid and filesystem

What is the relation between software RAID and a file system? Are they related? Should I use a file system when I am using software RAID or I can access raided disk for RAW read and write?
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1answer
32 views

Do I need RAID1 in a galera cluster?

I have a 3-node galera cluster that supposedly performs synchronous write replication across the entire cluster. I am trying to figure out if it is a good idea to use a software RAID1 3-HD on these ...
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1answer
99 views

Does mdadm record array event history?

I received an automated email from the mdadm daemon: A Fail event had been detected on md device /dev/md0. It could be related to component device /dev/sdh. I find the wording strange. "could be"? ...
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1answer
26 views

Is it possible to create striped array (RAID 0) with two parts on two disks (Windows 7)?

I have 2 physical disks. Part of one disk is occupied by Windows 7. I have two not allocated parts on these two disks of equal size. Is it possible to create striped array (RAID 0) with two parts on ...
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58 views

Growing mdadm array; Cannot find backup file on FS where it's supposed to be

The situation: I am currently growing my RAID-6 array from 4x4TB to 5x4TB. To achieve that, I used to following command: root# mdadm --grow /dev/md0 --backup-file=/root/backup/raid/4d_to_5d --raid-...
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Recover mdadm Raid5 array after one drive failure

I've been working through a number of posts on this issue but want a sanity check before trying to find a way to reassemble this array. I have a Mint 17 build with a raid 5 array for data storage (...
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1answer
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software or hardware RAID 5 for home server? [closed]

I have seen a few similar questions here but they are all years old and since the technology landscape is so volatile I thought it best to start afresh. Plus, few of them speak specifically to raid 5. ...
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32 views

Software RAID setup on an MBR drive

In Mike Meyers' CompTIA A+ book when talking about different partitioning schemes, he says "A dynamic disk volume is still technically technically a partition, but it can do things a regular ...
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39 views

RAID 5 showing two disks in same slot

We recently had a power failure for a few hours and when the power came back both my RAID arrays failed. The one I am trying to fix is a RAID5 with 5 disks (I also have a RAID1 with 2 disks, but I ...
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8 views

Debian Server I386 mdadm

Due system disk crash I had to reinstall a new debian server. On the previous server I had "sda": system "sdb" & "sdc" raid devices level 1 How to reconnect my former raid devices ? Regards
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1answer
368 views

How to convert a software RAID 1 partition to non-RAID partition?

RAID is not a backup, they say, but only now I can see that what I really need is an (external) backup. So, I would like to convert a (software) RAID-1 partition to a non-RAID partition (ext4) in my ...
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272 views

mdadm, Device or resource busy when adding sda

Trying to create a raid1 on a live system following this article: http://guylabs.ch/2013/09/17/create-a-software-raid1-with-mdadm-on-an-active-ubuntu-13-04-hard-drive/comment-page-1/ uname =a 3.13.0-...