Questions tagged [raid-5]

A type of RAID redundancy that includes parity data spread across a number of member disks

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can we identify which HDD has the operating system installed in the RAID configuration

I have a server using windows 2008 R2 and using a RAID configuration as storage. can I find out which HDD has the operating system installed in the RAID configuration?
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Clean up left-over around a RAID5 coming from a QNAP NAS

I just moved a 12TB RAID5 (4 disks of 4TB) from my QNAP NAS into my Linux Server (/dev/md0), and I noticed that there are three "left-over" partitions on each disk (/dev/sd*1, /dev/sd*2, /...
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Trying to create a net new mdadm raid 5 from old raid drives, and failing

Long story short, I have rebuilt a new new centos 7 system. It's a file storage system with 4 identical drives. They used to be part of a raid 5 system, but now that I've rebuild the system I want ...
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1 answer
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Is it possible to move RAID5 arrays in and out of a synology NAS

Basically we want to move our current 5x12tb drives (In raid5) out of the unit and store them in the cupboard. Then we want to put in new 16tb drives also in raid5. Is it possible for us to put back ...
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WD NAS PR4100 - Expansion - Upgrade Drive Capacity

I've searched on this topic for a while before I bought my new drives. First I tried cloning the drives; that didn't work. So I did the "preferred" method. Replace and rebuild each drive in ...
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How can I calculate the availability of my RAID 6 system?

For a project I have to proof that my RAID 6 system meets the availability target of 99,8%. I have 4 disks installed (2TB each). The formula for the array failure rate is given: Array failure rate (n.....
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How to read the information from RAID's HDD when NAS is broken and HDD are not?

Since my Synology NAS (DS411slim) declared as "hybrid" RAID5 I guess this means "software", the plan should be: I should get Synology DSM 6.2 as virtual machine image from ...
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1 answer
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mdadm RAID5 running degraded on Ubuntu 20.04

A long story short: my RAID5 array is running degraded. It may have been like this for a while and I don't know the history that led to this point, so I just want to remedy the situation. It would ...
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RAID 1 to RAID 5 failure

I need your valuable help on this: I have a NAS which is capable of having a RAID with four disks. I used it for a long time with only two, sda and sdd on RAID 1 - they are WD30EFRX. Now, I bought two ...
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Linux Raid5 lost on reboot, superblocks not detected

Edit : Thank you very much Tom Yan, it worked after resetting the array and calling wipefs -a before recreating it. I can’t figure out how to set up my RAID5 array. When I create it, it seems fine but ...
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mdadm RAID5: can't read superblock on /dev/md127

Today, when I wanted to replace a failed HDD on my mdadm-RAID5, the RAID stopped working at all. sudo mount /dev/md/md127 /media/ mount: /media: can't read superblock on /dev/md127 Checking the ...
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Slow MDADM Raid 5 reads/write speeds

I set up a Raid 5 array from 4x4TB drives with mdadm. But the writes/reads are quite slow and I want to find out why. It isn't CPU-bound as the CPU usage during I/O operations is only around 10%. I ...
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1 answer
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RAID 5 - replacing failed disks with larger disks

I have a RAID 5 array with 12 disks, each 12 TB. It is controlled by a hardware RAID controller (LSI 9380-4i4e) on Windows Server 2012. As they eventually fail one by one, if I replace the failed 12 ...
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My BuffaloNAS LS-QVL stuck at Resyncing RAID

My BuffaloNAS LS-QVL 4bay / 1bay per 1TB lost raid5 so I try perform Check disk and then web ui stuck at page : "Checking drive... Progress: Progress" Since 9 Nov 2021 13:14:23 and then in ...
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3 answers
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RAID 5 bad sector / read error when rebuilding

Say I have a RAID 5 (Windows parity storage pool) and one drive fails. I will plug in a new one and start rebuilding. There are many people saying that if one of the remaining drives has a read ...
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1 answer
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Recoverability of Windows 10 storage pool (Software RAID 5)

I'm currently looking into RAID 5 for my growing data for my home PC and some things are still unclear to me. I currently have each of my drives backed up by an additional "backup" drive and ...
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1 answer
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Dell Poweredge Controller and ZFS

I've been looking at many different option for a home backup server. I'll going to be getting a dell poweredge r430. It contains a perc h730 mini. It has dated hardware, and I plan to pare it with ...
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MDADM array rebuilding after every reboot

I have just grown my RAID-1 mirror in to a RAID-5. After adding a 3rd disk, the array rebuilt successfully, but after restarting the array was showing as inactive, and the new disk (sde) had lost all ...
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PC stalls and eventually crashes

I am home for the holidays and my father is having computer issues I was asked to fix, but am unsure of how to fix the issue. I have a server running Windows Server 2008 R2 Standard edition that has 5 ...
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Clone harddrives in raid5 configuration to larger hadrdrives

If i sector clone 3 disks (2 x 3tb and 1 x 4tb) that have a raid 5 configuration to 3 new disks (3 x 4tb), will the raid 5 configuration work on the new disks right away, and put empty space at end of ...
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How to scan and repair RAID 5 using mdadm

Raid5 on a server is having problems the last two times I rebooted. CentOS does boot up after 10-15 minutes. Is there a way I can scan the raid and repair it? I was reading the man page and mdadm --...
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Dell R710 RAID PERC H700 Foreign Configuration(s) issue

Just getting around to setting up my server from it sitting some 2 years without plugging it in or running it at all. Now prior to it sitting I did have it running for awhile and I know it does run as ...
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Incorrect free space RAID 5 on Asustor AS1004T

I have an Asustor AS1004T NAS with 3 WD Red 3TB's in RAID 5. (WDC WD30EFRX-68EUZN0 in case anyone cares). This gives me a total volume size of 5.36TB. Recently one of the WD's became faulty and I RMA'...
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What does delta devices of the mdadm--detail output mean?

Here is an output of mdadm --detail: $ mdadm -D /dev/md2 /dev/md2: Version : 1.2 Creation Time : Wed Jun 24 16:41:17 2020 Raid Level : raid5 Array Size : 7809195456 (7447.43 GiB ...
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Synology NAS: Volume exceeded storage capacity limit

i have a synology NAS with a 32bit cpu and four 6TB hdd's (usable ~5.5TB). Those four disks are bound in a raid5 storagepool (diskgroup) of 16.0TB. This storagepool contains a single volume of 15.87TB ...
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RAID 5 with SSDs; how many and what class of SSDs to use?

I have a 850 EVO 250gb as win/programs/games disk and I am thinking buying more SSDs to go with RAID 5 in order to gain more speed. I know the pros and cons of RAID 5. The question is: 5 cheap 120gb ...
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RAID 5 rebuild failed after removing and reinserting a disk

I have a Synology Diskstation 414j at my home that runs RAID 5 across 3 drives. I was curious to see what Diskstation looked like on the inside, so I unscrewed the back, took out the drives, and put ...
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Reshaping RAID-1 to RAID-5 hangs forever

I have a problem with reshaping RAID level 1 to RAID level 5: it's been hanging at 41% for a few days now. Some background (verbose, since I don't know will end up being relevant; apologies). The ...
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2 answers
1k views

How to migrate mdadm RAID10 with 4 disks to RAID5?

I have a software RAID10 based on Linux’ mdadm under Debian Buster. Originally I found RAID10 had best performance. But I need more space and accept to trade some write performance for +50% space. # ...
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HP Proliant DL360p gen8 Unrecoverable Media Error. Amber lights on 3 disks

I have HP Proliant DL360p gen8. 4 disk on RAID 5, 3 of them have amber light on them. I did chkdsk on my virtual machines none reported any error. Am I able to fix it without buying and replacing ...
2 votes
1 answer
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Ubuntu server RAID-5 failed, rebuilding fails

My Ubuntu server now fails to boot: It uses a RAID 5, and one of those drives failed. The OS is on the RAID array, and rebuilding now fails with the replacement drive. I can't post pastebins or ...
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RAID controller failure...! Can I just pop disks into another controller, same make and model(ish)

My Promise Smartstor DS4600 went pop! It has 4 drives set up as RAID 5. I have purchased a second hand Promise Smartstor NS4600, which I beleive uses the same hardware (Just has added network ...
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How to safely configure/use SW RAID 5 with Raspberry PI 4b / DietPi without data loss?

This question is also to clarify if I have a decent bug here, software or hardware. My aim is to set up a SW-RAID-5 to my Raspberry PI 4b system using a USB3.0 HUB with 3 4 TB Western Digital hard ...
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1 answer
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Recovering data from Synology NAS – RAID5, ext4, "number of reserved GDT blocks insanely large"

I have a 4-disk RAID5 array that had one of its four 3TB HDDs die. Being that RAID5 can tolerate a single drive failure, I'd like to try to operate the RAID5 without replacing the dead drive. (Run ...
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1 answer
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raid(5)-hdd poor performance vs single ssd drive

i have a raid 5 configuration on HP gen9 server with eight hard disks (hp-10k-1.2TB disks). that server intended to serve as a Microsoft SQL sever and contains a database with 143GB size. i have run ...
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Can I use three SSDs in RAID 5 with an operating system install on one of them?

I have three identical 500GB M.2 SSD's installed on my motherboard, and want to run them all in a RAID 5 array, where I would have ~1TB usable storage. I currently have Windows 10 installed and ...
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RAID 5 Windows 10

Rev 1. - Provided Screenshot for Further Clarification. When I convert my storage drive from a basic to a dynamic disk in Windows 10, using diskpart.exe, there is one partition but no volume to go ...
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1 answer
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Degraded RAID5 after complete disk failure - What to do Now?

I am running OMV 3.0.99 on my NAS. I have set up a RAID5 (with mdadm) containing of three 5TB WD RED drives. I have set up the RAID using the OMV GUI back in the day (2016). Recently one of the disks ...
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1 answer
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RAID 5 parity bits - recovering data

This is an old topic but I have a question about RAID 5 parity bits that confuse me. My question is: So that, in every explanation of RAID 5, it is said that RAID 5 has parity bit in every disk. And ...
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Dell PERC H810 - Import foreign config with 2 drivers with SMART errors and 1 total fail?

We have a 12 drive, 40 TB storage bay that all of a sudden encountered multiple drive failures On RAID 5. One drive we have replaced outright, while another two have SMART errors. When the drives ...
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BTRFS RAID5 disk failed while balancing

If you clicked on the link to this topic: Thank you! I have the following setup: 6x 500GB HDD-Drives1x 32GB NVME-SSD (Intel Optane) I used bcache to setup up the SSD as caching device and all ...
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RAID 5 Windows 10 Host OS Running CentOS-Linux in VirtualBox

This is my first time using a Virtual Machine so please forgive my ignorance. My computer is running Windows 10 and then in VirtualBox I'm running CentOS. I have 3 new 1TB HDDs. I want to run the 3 ...
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What actually happens during a RAID 5 expand?

I have just started the expansion of a RAID 5 from 3x3TB to 4x3TB in a Synology. This is all very easy, a few clicks and it’s doing its thing for next few days. But, what actually happens during a ...
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How to diagnose/fix slow file management on Windows Server 2012?

The setup is: FUJITSU PRIMERGY TX300 S7 RAID Ctrl SAS 6g 5/6 512mb (d2616) Windows Server 2012 64 bit Volume C: RAID 1 (2 HDDs) Volume D: RAID 5 (8 HDDs) The problem is: When we do ...
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RAID 5 Array: Probability of Failing to Rebuild Array

I have a Qnap ts463u-rp data storage array, which contains 4x4TB HDD. my question here is, is it safe to configure 3x4TB as RAID 5? because from what I understood, it's not recommend to configure ...
2 votes
1 answer
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RAID5 mdadm faulty / blk_update_request: I/O error

I have five raw images of a server's disks (stored on one external HDD). Each of those disks contains two partitions which are "Linux raid autodetect" (fd) and are members of RAID1 (boot-related; 3 ...
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1 answer
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Personal RAID5 long run maintenance

I'm considering to build a RAID5 storage from three 8TB hard drives inside my PC being run under Windows 10 Home (if it matters). In my motherboard's manual I can see instructions how to setup RAID5 ...
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2 answers
719 views

Is there a way to replace RAID 5 drive without failing it first?

I have a software RAID-5 made up of 3 drives, call them A,B,C. I would like to replace the old C drive with a newer and larger-capacity one to eventually expand the array. This is on an Ubuntu 16.04 ...
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RAID5 does not spindown after grow (ext4lazyinit)

I had a RAID5 array consisting of 3x5TB disks assembled using mdadm. On top of that, I created a LUKS/dmcrypt encryption layer and formatted the encrypted device with ext4. I want the disks to spin ...
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Storage Spaces out of space

I'm using Windows 10 Enterprise. I have four identical 3TB disks set up in a Storage Space pool. Each disk shows up as providing 2.72 TB to the pool. I create a storage space with REFS and resiliency ...
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