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Questions tagged [raid-5]

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

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RAID 1 vs RAID 5 for single block read

will the speed of single block read of RAID-1 be faster than RAID-5? can a single block be read in parallel in RAID-1? I think not because if reading in parallel sequence had to be maintained. or will ...
gunslinger's user avatar
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Raid 5, single disk failure

A friend's Raid 5 array going down. OS: Windows 10 on SSD, not on RAID Raid controller: HighPoint RocketRAID 2720 controller Raid 5 of 8x8TB drives HighPoint controller is managed through their ...
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2 Disks Suddenly Showing as Spares on Raid 5 Array

I have a raid5 array in a Seagate Blackarmor 440 nas that suddenly started showing disks 1 and 4 as "failed". I moved all of the drives over to a Ubuntu box and tried to assemble the array ...
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How does RAID 5 handle unrecoverable sectors on a HDD

I'm going to set up a RAID 5 on 4 hard drives on my ubuntu system. I plan to use ext4 on a logic volume. Suppose one disk reports an unrecoverable sector. How would RAID 5 handle this? My ...
Xylas Quinn's user avatar
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Recover RAID5 volume after temporary failure of controller

I have an LVM RAID5 configuration, where two LVs are currently not active because one SATA controller did not properly resume from suspend, consequently leading to two devices, i.e. two PVs, failing. ...
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Can I run RAID5 with different cache size?

I had RAID5 that all Hard drives are HP and has 64 mb cache (HP MB2000GCVBR). I want to replace one hard drive but there is no one in the stock as the same (same brand and cache size). I have found ...
Abd Alrhman's user avatar
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OpenMediaVault5 NAS [RAID Management] "State: clean, degraded", [File Systems] "Status: Missing"

I do have a NAS that runs OpenMediaVault5 (version:5.5.13-1 (Usul)), use 11 HDD in RAID5 and that have (actually had till today) available 12TB of space. From this morning, all over the sudden, it ...
Victor's user avatar
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RAID5 failure but drives are OK. 2 of 5 drives "failed" simultaneously. How to restore? Windows 11, Intel RST

I have two drives in my RST RAID5 drive registered as "unknown" and thus the RAID5 array with 5 drives reports as "failed". Windows 11 Pro 23H2, Intel RST (Intel Optane Memory and ...
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Creating a RAID-5 using Storage Spaces in Windows 11

I want to try the new Storage Spaces in Windows 11. Some years ago I bought an external enclosure with 5-bay for hard drives and also provide RAID 5 functionality out-of-the-box. It works pretty good ...
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RAID server went dark

So I have a Gigabyte 277x MB with a Intel i5 that has been running 2 software raid arrays on Ubuntu for 3 years without issue. Last night I turned off server to move it and clean it and then turned it ...
Shane Greenfield's user avatar
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Does RAID5 need synchronization all the time?

I have a TS-453D NAS with 4x10TB HDD disks. I have reinstalled it from scratch - it never asks me to format the disks though - but when I created the Storage Pool as a RAID5 it started to sync "...
ReynierPM's user avatar
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RAID5 (3xHard-Disk) status FAILED suddenly, what should do?

There is a data server in a PC case just for purpose of synchronization and sharing data in a local network that is running 24/7 except in case of power outages. I did not install the RAID ...
MMMahdy-PAPION's user avatar
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mdadm lost RAID5 after new motherboard and processor

I moved my mdadm RAID5 to a different motherboard/processor, same boot drive. The array is no longer found during a mdadm --assemble --scan The motherboard was previously running INTEL RAID, so when ...
Essonworks's user avatar
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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 ...
Quadgnim's user avatar
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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 ...
Ryan Bester's user avatar
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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 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 ...
Roman Pokrovskij's user avatar
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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 ...
StuartM's user avatar
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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 ...
Jorge Nunes's user avatar
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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 ...
1234filip's user avatar
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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 ...
Brionius's user avatar
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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 ...
Suramongkol Penchome's user avatar
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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 ...
Lukáš Řádek's user avatar
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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 ...
Shiwayari's user avatar
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637 views

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 ...
Mapy's user avatar
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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 ...
user081198's user avatar
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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 ...
Driver123a's user avatar
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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 --...
mister mcdoogle's user avatar
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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'...
PeterH's user avatar
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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 ...
michael.kebe's user avatar
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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 ...
Michael's user avatar
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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 ...
selfmade.exe's user avatar
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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 ...
Unknown's user avatar
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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 ...
bronzehedwick's user avatar
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2 answers
2k 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. # ...
Daniel Böhmer's user avatar
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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 ...
Igor Sikora's user avatar
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1 answer
671 views

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 ...
Tomtenberge's user avatar
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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 ...
Russell's user avatar
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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 ...
pedda's user avatar
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2 votes
1 answer
1k views

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 ...
Datanoob's user avatar
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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 ...
noshin erfani's user avatar
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677 views

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 ...
Mike's user avatar
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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 ...
blackpine's user avatar
3 votes
1 answer
2k views

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 ...
bash0r1988's user avatar
1 vote
1 answer
702 views

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 ...
G.Baysec's user avatar
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273 views

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 ...
Taylor F's user avatar

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