Questions which refer to software RAID implementations.

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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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9 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 ...
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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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7 views

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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software RAID alternative with file-level striping (not block striping) [migrated]

Is there a software RAID alternative with file-level striping? I'd like the the total capacity of the disks in the set to sum up like in RAID-0, but i also want the individual disks to be still ...
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1answer
16 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
10 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
16 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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70 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
37 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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55 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
37 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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0answers
20 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
23 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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28 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
43 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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2answers
50 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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0answers
19 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
153 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 ...
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156 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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26 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
46 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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61 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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19 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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67 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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9 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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18 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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23 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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1answer
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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
271 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
146 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
24 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
67 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
25 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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44 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 ...
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44 views

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
36 views

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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30 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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36 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
267 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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1answer
242 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 ...
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1answer
75 views

Assemble 3 drive software RAID5 with one disk missing

Is it possible to assemple a three drive software RAID5 with only two disks? I have one failed disk in my setup which i could not read at all but the two other disks are fine. So i created a dump of ...
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1answer
115 views

BTRFS, Files on a single drive in array but keep 2-parity?

Is it possible to setup a BTRFS array of disk but tell it to keep files on individual disks instead of stripping them and still keep a 2-parity? The idea is that if three drives die, the files on the ...
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51 views

Windows 2008 RAID5 - How Many Disks Have I Lost?

I have an HP ProLiant Microserver running Windows 2008 R2 Standard, it has a 512mb system drive and 4 3Tb Seagate Barracuda drives running in software RAID-5 which give around 8.2Tb of storage. I ...
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1answer
202 views

Reconnect drive to raid-1 array with mdadm

I need a large and relatively robust backup method. I had an old desktop running debian and put in two identical 2tb drives in raid-1 configuration using mdadm So I would start the array using ...
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0answers
49 views

How to turn a current drive into a RAID array?

Everything I've been able to find by googling on creating RAID arrays assumes you are starting from scratch with blank disks. However, I have a drive that is almost filled, and would like to turn it ...
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2answers
2k views

Use software RAID 1 drive as main disk and boot drive in windows 7?

Can I boot from a software RAID 1 (mirroring) drive in windows 7? Windows 7 would not let me install to a software RAID volume so I installed to the first disk and then added the second disk ...
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1answer
121 views

Win 7 64-bit slow during software raid 1 resyncing

I read about the slow resyncing here: http://serverfault.com/questions/107636/how-to-view-status-of-software-raid-1-resynching I have a different question: not only is my resyncing slow; but during ...