Questions tagged [raid5]

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fsck: error 2 (No such file or directory) while executing fsck.ext4 for /dev/md0

I have a raid5 which is inaccessible after unexpeted power outage. Details: # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10] md0 : active ...
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1answer
14 views

How to track the start and end time of a raid5 rebuild?

This is my first post on the forum, so bear with me. I am new to the linux environment and also new to raid configurations. I am doing a work project where for part of this project I am measuring ...
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Unable to resize filesystem on a raid 5 array “Unable to satisfy all constraints on the partition”

Until recently, I was using my raid 5 array with 4 disks but I added two more disks to the array and used the --grow option to actually grow my array. Now I have an array with a 2.7 TiB filesystem and ...
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1answer
25 views

Grow LVM RAID5 by identical disk, not enough extents

I have an existing LVM RAID5 array on a CentOS 8 box made up of 3x4TB drives. That array is beginning to run low on space, so I have an identical 4TB drive I'd like to add into the array to increase ...
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Mdadm Raid6 Re(assemble|build|create) from 6x disk images of original array

I have 6 1TB drives from several years ago. There was a problem with the Seagate drives's microcode, so I updated it. Unfortunately, this reset the UUID of two drives and the RAID6 array was broken....
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1answer
37 views

Migrate Single Disk to RAID [duplicate]

I have a home server running Centos 7 that I'm using to host various different servers - a webserver, two Minecraft servers, and a PLEX server. Currently I have a 4TB HDD which serves as the primary ...
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1answer
59 views

Can't create filesystem on a freshly made raid5 using mdadm

I connected a 4-bay enclosure with 4 new 8TB disks to my rPi. This disks appeared in lsblk as sda to sdd. Following this tutorial I created the array doing mdadm -C /dev/md0 --level=raid5 --raid-...
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40 views

Moving RAID5 to new system

I have a RAID5 with 3 drives currently running on a 14.04 install. Everything is ok, but the system is a bit underpowered. Therefore I have gathered together some new hardware and installed 18.04 on ...
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25 views

How can I speed up mdadm integrity check stuck at USB 2.0 speeds?

I have an array (/dev/md2) that is constructed with mdadm as a RAID5. The drives are connected in an external enclosure over USB 3.0 and when tested with hdparm show a read speed of 225MB/s. However,...
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mdadm RAID5 to RAID6 migration thrown exceptions, access to data lost

After a dozen of hours waiting for my array reshape to move on I think it's finally the right time to ask you for some advice. Recently I bought 4th WD Red 4TB drive to migrate my 3-disk RAID5 setup ...
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1answer
185 views

How to check mdadm RAID5 integrity after power failure/random reboot

So I'm currently building an mdadm RAID5 array attached to my home server. The hardware is an Odroid N2 SBC with a Mediasonic Probox 4 bay enclosure attached. The array is currently rebuilding and ...
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2answers
60 views

Can I Increase raid 1 capacity by changing to raid 5?

My initial raid setup was 2x2TB RAID 1 using mdadm. I have bought a 3rd 2TB drive in the hopes to upgrade the RAID's total capacity to 4 TB using mdadm. I have already run the following two ...
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1answer
35 views

RAID 5 crash… trying to save what I can [closed]

I have a QNAP server with 8 disks. I have 2 backup/extra disks that are not in use. (I had the money an knew eventually the running ones would need replaced) The full array was across the 8 disks @6TB ...
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407 views

How to recover data from synology Raid 5?

My old synology server (cs407s), died. So I'm trying to retrieve the data from the disk. I have tree disks from RAID 5. I tried to mount the disk on computer running grml. # lsblk sda 8:0 0 ...
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1answer
333 views

Recovering a Failed Software Raid5

I'm looking to recover data from 4 old HDDs set up in a software raid5 and it looks like a disk has failed. What I want to do is recover the raid so I can copy its data somewhere else. I have done ...
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3answers
941 views

Add linux md raid write journal to and existing array

I have a raid5 array with quite large disks, so reconstruction is really slow in case of a power outage. Thankfully, there is the --write-journal option for linux md raid. The man page lists the --...
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1answer
184 views

Build RAID 5 with mdadm and 1 disk with data

I have 3 exactly the same drives (4tb ironwolf) where i would like to make a raid-5 with using MDADM for a small degree of data security. Now the problem is, 1 drive is filled with data which i am ...
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2answers
59 views

Why isn't the space of Raid 5 array equal to sum of disks?

I'm trying to create raid 5 from four disks: Disk /dev/sdc: 8001.6 GB, 8001563222016 bytes /dev/sdc1 2048 4294967294 2147482623+ fd Linux raid autodetect Disk /dev/sdb: 8001.6 GB, ...
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1answer
571 views

mdadm, invalid RAID level?

I'm trying to create RAID 5 according to this tutorial. But, when I run mdadm -C /dev/md0 -l=5 -n=4 /dev/sd[b-e]1, I get this error: mdadm: invalid raid level: =5 Here's the output of mdadm -E /dev/...
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347 views

Rebuilding mdadm RAID 5 array with multiple failed drives

I had a 5 drive Raid5 array and I've had two drives fail. I have fresh drives to swap out, but when I'm trying to start it it complains '/dev/md/0 assembled from 3 drives - not enough to start the ...
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1answer
355 views

Moving drives currently in software raid to LVM? [duplicate]

I have 3 drives currently set up in RAID 5 via mdadm. I just realized that I goofed and forgot to format them with LVM- is it possible to do this after RAID array creation without losing data?
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370 views

MDADM - adding a disk to RAID5 with slightly less sectors

Basically I have raid 5 with three disks that are 2TB each. I bought 2 extra 2TB drives however they are few sectors smaller on a newer model - old drives are no longer sold. When I issue /dev/md0 ...
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1answer
73 views

rebuilding mdadm raid5

I've dusted of a machine of which I want to repair an mdadm raid5 that I messed up. First the raid5 was 3 disks. A spare was added, just before one of the three started to fail. Spare one got used and ...
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1answer
238 views

How do I work out what's trashing my RAID?

I have an x86_64 Ubuntu 17.10 install (stock 4.13 kernel) with an SSD and three 1TB WD HDDs which each have a 750GB partition that's used in a 1.45TB RAID5 array. The SSD has my / on it, and the RAID ...
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540 views

Help recovering a raid5 array

A little bit of background first. I store a bunch of data on a Thecus N4200Pro NAS array. I had gotten a report that one of the 4 drives in the array was showing smart errors so I swapped out the ...
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0answers
410 views

Unable to mount raid 5 (Intel fakeRaid)

I recently corrupted my linux distro. I then reinstalled Ubuntu 16.04.3 and after setting it up, I have been unable to mount my Raid 5 setup after extensive troubleshooting. Note even after the ...
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1answer
497 views

mdadm RAID5 cannot be assembled

Yesterday I wanted to do some maintenance on my server. I shut it down pressing the powerbutton once which works just fine every time. After the server was still shutting down after 10 minutes I ...
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290 views

need to rebuild mdadm raid5

I've got an mITX nas running Arch with a Raid5 mdadm softraid. Lasttime it booted correctly Aug 19 11:30:21 nas kernel: md/raid:md127: device sdc1 operational as raid disk 1 Aug 19 11:30:21 nas ...
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1answer
751 views

Unable to mount raid 5 array (mdadm), with no drive errors

I have a 3 drive raid 5 array using the following disks: /dev/sda /dev/sdc /dev/sdb I'm no longer able to mount the drive with the following error: sudo mount /dev/md0 /mnt/md0/ mount: wrong fs ...
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1answer
735 views

Add hot spare drive to Intel RST (onboard RAID)

I'm using 3 disks (RAID5) and want to add a spare disk (dev/sdd). The system is using Intel RST (onboard RAID), and can be recognised by CentOS7 and mdadm command. But I tried many methods, and cannot ...
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2answers
78 views

Building a network storage server, trade-offs of different RAID configurations?

I want to install a Linux server in my house to be able to share documents and multi-media files between every devices here. The machine I have has 3 HDD slots, I need at least 3.5 TB of storage and ...
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1answer
1k views

LVM RAID 5 not resulting in logical volume size expected

I'm having an issue with LVM RAID 5 not allowing me to create a LV that uses the space on all four drives in the VG. What is particulary annoying is that I create this very same VG/LV using the same ...
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1answer
680 views

How do I force a LVM2 RAID5 logical volume to span across an additional physical volume?

I'm testing LVM configurations for the purpose of building a home NAS with Ubuntu Server 16.04 LTS. I first added three 20GB disks to my machine (sdb, sdc, sdd), created three physical volumes grouped ...
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1answer
3k views

How to create a 3x3TB RAID 5 array without losing data from 2 of the drives?

I currently have 2 3TB HDDs, one that is always almost full, and another with ~200GB free. I would like to purchase an extra 3TB drive and setup a RAID 5 array, but I am concerned about losing the ...
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1answer
174 views

ubuntu - raid partition capacity unchanged after RAID1 to RAID5 to RAID6

I had a 2 disk RAID 1 partition. I added a device and converted it to RAID 5: mdadm --add /dev/md3 /dev/sdd2 mdadm --grow /dev/md3 --level=5 --raid-devices=3 Then added another device and converted ...
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1answer
375 views

Recover RAID5 array after partitions deleted

I have (had) a large RAID5 array (3x8TB) up and running on Ubuntu 16.04 using the guide on the following page: https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-...
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1answer
390 views

Replaced drive not syncing in RAID5 configuration (shows as spare)

I've a RAID5 configuration (4 drives). One drive failed, showed up as a failed device in mdadm. After rebooting, the failed device didn't even appear in mdadm. The RAID5 config only had 3 working ...
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1answer
206 views

How to recover a raid5 on nas with a failure partition? [closed]

I have a RAID5 on SYnology nas system that has crashed. In first the system prevent to one disk has been removed from the raid with the degraded status. After a shudown to unplug the disk and restart ...
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2answers
795 views

Disk I/O performance issue [closed]

I have a Dell PowerEdge R820 server which is under maintenance by other third party. There are 6 SAS (10K RPM, 6gbps) disks and they are configured as RAID 5 using PERC controller. Currently I am ...
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2k views

Arch Linux Server: How to spin down HDDs in a BTRFS Raid5 configuration?

This is my first question here; after extensive research I had to reach out for help. I’ve build a home server based on Arch Linux. It basically has two main purposes: running a Plex Media Server and ...
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1answer
48 views

RAID5-4 devices with 2 failed devices: hope to retrieve data?

I built a RAID5 array with 4 2Tb devices a few month ago. - I used LVM2 to build partitions. - I also used GRUB2. - Finally I installed Debian. For an unknown reason the RAID failed. The BIOS "see" ...
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1answer
602 views

BTRFS, RAID5 and the minimum number of drives required

It's been my understanding that in order to have a RAID5 setup, one would need to incorporate a minimum of three drives. Basically (and probably poor paraphrasing) two blocks of data and a block of ...
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32 views

Can 99-raid-check weekly cronjob be scheduled to run in increments?

I have a raid5 on UNIX. Can I somehow automatically schedule the weekly 99-raid-check to run in increments? During the day it affects the performance, so I don't want it to be doing its check during ...
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1answer
907 views

raid5 array reassembles as raid0

I found simmilar problem here: Missing mdadm raid5 array reassembles as raid0 after powerout, but mine is a bit different. Here too my raid5 reassembles as raid0, but i don't see any of my devices ...
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1answer
157 views

Cannot mount RAID 5 disks

I am trying to mount 3 x 2TB RAID discs from an ubuntu server, but I cannot. I know that these disks were used in a server using RAID5. I tried to mount them using mount -t but I was unable to specify ...
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206 views

RAID5 needs drive to be added every reboot

I have a 3 disk RAID5 mdadm array total 4TB on an Ubuntu Server 14.04.3 LTS. Since a kernel panic caused by an already replaced device unrelated to the array, after every reboot the array starts [UU_]...
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1answer
11k views

mdadm: /dev/md0 assembled from 3 drives - not enough to start the array

I had a drive in my raid5 fail a while back. I believe the problem was due to a power failure at the time, but originally thought it might be the hard drive controllers on the motherboard (this is a ...
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1answer
56 views

RAID-5 array degraded, seems like >1 failure; can I recover without data loss?

I just installed Fedora 22 fresh, onto system with existing RAID-5 array. Five drives. Kernel reported device errors overnight, the 3 TB XFS filesystem was unmounted, and now after a reboot the ...
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0answers
209 views

mount LVM RAID 5 with missing disk

I have a software RAID 5 (LVM, XFS) with three 2 TB drives. Is it possible to mount the RAID with one missing drive (instead of having to rebuild it)? How would this be done? [Edit] My /etc/fstab ...
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1answer
73 views

Redhat 5.11 Just showing 1.5TB Storage

We purchased new supermicro server with 3*3TB HDDs. Now from Hardware Raid controller i created Raid 5 .So the total use able storage is 5TB something. But during installation Redhat is just showing ...