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Questions tagged [raid5]

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1answer
27 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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0answers
162 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
98 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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1answer
411 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
60 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
45 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, ...
1
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1answer
251 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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2answers
152 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
263 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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2answers
126 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
43 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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0answers
69 views

Can I check hardware status on a CentOS HP8 server from CLI?

I was wondering if there is a way to check our G8 server’s hardware raid status from the CLI. In person there is a nifty light that shows any errors. Ideally I would be able to set a monitor to ...
1
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1answer
114 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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2answers
170 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
282 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 ...
3
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1answer
275 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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0answers
235 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
609 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
519 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
65 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 ...
0
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1answer
742 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 ...
2
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1answer
428 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
2k 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 ...
2
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1answer
119 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
280 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-...
0
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1answer
272 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 ...
1
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1answer
179 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 ...
1
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2answers
626 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 ...
2
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0answers
1k 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
43 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
529 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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0answers
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 ...
1
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1answer
723 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 ...
0
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1answer
126 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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0answers
195 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_]...
2
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1answer
9k 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 ...
1
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1answer
54 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
188 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 ...
0
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1answer
72 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 ...
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1answer
1k views

Repairing a RAID5 array

I'm trying to repair a RAID5 array, consisting of 3 2TB disks. After working perfectly for quite some time, the computer (running Debian) suddenly wouldn't boot anymore and got stuck at a GRUB prompt. ...
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0answers
619 views

How to put in new disk in a MegaRAID SAS 2108 HW RAID card?

It's in RAID5, we already have 4 disk in it. 1 is a spare. 01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] (rev 05) with 4 disks. Question: How can we put in ...
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1answer
95 views

How to restore RAID5 Array

I have a RAID5 array consisting of 3 identical 2TB drives. Suddenly GRUB wouldn't boot anymore and gave the error out of disk. Eventually booted a livecd and ran some mdadm commands: mdadm --examine ...
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2answers
104 views

challenging failed raid5 recovery

I have a personal raid 5 array that is in rough shape. The failed array has eight 2 TB drives that were built up over time in my n-2 desktop machine. The array is from an in-house computer that ...
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1answer
1k 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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1answer
1k views

HP SmartArray RAID5 recovery on linux

This is a long time in the making, and I've finally got it working so I thought I'd share this with as many people as I can in case they're in a similar situation. Long story short - HP SmartArray ...
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2answers
258 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 disks,...
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2answers
1k views

Missing mdadm raid5 array reassembles as raid0 after powerout

I had RAID5 array of three disks with no spares. There was a power out, and on reboot, the array failed to come back up. In fact, it the /dev/md127 device disappeared entirely, and was replaced by an ...
3
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1answer
395 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 ...
0
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1answer
144 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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4answers
3k 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 kernel:...