Questions tagged [raid5]

RAID (redundant array of independent disks, originally redundant array of inexpensive disks[1][2]) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels", depending on what level of redundancy and performance (via parallel communication) is required. RAID 5 is a specific implementation.

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Software RAID5 missing file-system; volume group. can data be recuse?

I try to recuse my 8TB raid5 in UBUNTU20.05. Below are what I have done: root@ubuntu:~# mdadm --detail /dev/md2 /dev/md2: Version : 1.2 Creation Time : Wed May 10 20:26:39 2017 ...
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Need Help Restoring A Failed RAID5

I was handed a Seagate NAS with 4 HDDs set up as RAID5. One of the drives failed: won't spin up, clicks, etc. The other 3 drives are fine. They spin up, when connected via USB, the data on them is ...
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Recovering mdadm 4-disk RAID5 array with 2 out of date disks

Edit: The scenario in this wiki, where 1 drive has a slightly lower and another a significantly lower event count than the rest of the array, suggests assembling with --force while leaving out the ...
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SAS RAID5 Disk failure, replacement enclosure not matching

A SAS disk in RAID5 array failed yesterday and I'm about to replace it, however I noticed the front enclosure wasn't matching the rest of the disks. The array consists of 300GB 10K SAS disks with the ...
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mdadm raid5: All disk appear as spare

I had a power plug removed for 2 of the 4 disks of my raid 5. Since then it cannot start. Even with --run --force, --readwrite, etc. I quickly saw it so the data should not be (too much) corrupted. ...
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Have I lost data? Can I copy a MD superblock from one drive to another?

My friend's RAID5 has lost two disks -- one failed months ago, apparently, but the other dropped out and the data is believed to be okay. I can run mdadm --examine on (clones of) the two surviving ...
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Raid Status - Online vs Ready vs Foreign

What does Raid state Online, Ready or Foreign means? What other state can it be? What needs to be done in such state? I think Online is the only safe state. What are the DO's and Don't during ...
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extending a LVM partition > 2TB on Fedora 31 to use all unallocated disk space

We have a Dell R420 with the Perc H710 Mini that was configured with 3 1TB drives in a RAID 5. I added another 1TB drive and thanks to a little help from the Dell discussion board, the RAID 5 ...
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“Hot plug replacement too small” although disk is of same size

On one of our servers, a disk failed that was part of a RAID 5. I replaced that disk with one of identical size. However, the RAID does not start to rebuild. If I check the status of the disk with ...
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Storcli “incomplete foreign configuration”

I have a huge Problem with my Raid. After a lightning strike my EP420 was gone dead. I had no identical controller so I had to replace it with an EP540 After booting the Raid isnt working. Storcli ...
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mdadm raid5 starts recovery right after creation

just for getting some experience with mdadm I've put some HDD together and try a bit. I have 2 250 GB and one 500 GB HDD. I know thats not optimal for RAID5 and I'll only get 500 GB capacity in total. ...
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What a benefit of RAID 1,5,10 vs every night simple diff backup

Given: 2 HDD in RAID and case when we lose 1 of them after 3 years: If we use RAID 0, we lost data If we use RAID 1, we have a copy on possible also bad-health disk, any restore may cause failure ...
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Restoring RAID 5 with Windows 10 Storage Spaces

I'm configuring specification for PC that will be used as host for virtual machines. I planned to use 120 GB SSD drive for OS (Windows) and 3x1TB in RAID 5 for Virtual machine. I'm wondering if it's ...
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Server won't boot after adding two new disks

I have an HP ML350 G6 server with 3 600Gb SAS drives on RAID5. I added 2 new 1Tb disks and configured a new Array with RAID1. Al of a sudden I got the blue screen of death, the server rebooted and now ...
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Grow an mdadm RAID5 array with fewer, larger disks

I have a linux software RAID 5 array, made up of 5 x 3 TB drives, giving me roughly 12 TB in total. I want to replace the disks with newer 8 TB drives, but since these are still quite expensive, I ...
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Confusing RAID-5 numbers

raid-5 It's a mixture of 500GB x2 and a 320GB. (465, 465, 299.9 ish effective.) I've never done raid before but I tried to get as close to the pool capacity as I could. The disk space should be ...
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Drive allocation in a RAID 50 array on a HPE DL380 G9

I have a DL380 G9 with 12x8TB 3.5" disks: | 1 | 4 | 7 | 10 | | 2 | 5 | 8 | 11 | | 3 | 6 | 9 | 12 | In the Smart Array Controller GUI, if I select all 12 disks and assign them to a RAID 50 array, how ...
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9500s unit inoperable via tw-cli though … salvageable?

hope there's still someone out there that might be able to chime in :) I've powered on a very old server that's been sitting cold for 3-4 years in hopes of migrating an old raid5 array with some ...
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Multiple RAIDS on same disks [closed]

On a server, I have 3 SATA disks. I'd like to create a root partition in RAID 1 of 50GB and a data partition in RAID 5 with the remaining spaces on my disks. There would be 2 different RAID types on ...
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Replace RAID 5 without losing system on a Dell r710 Perc6 Debian

I have a Dell r710 running Debian and just got it tuned to my use. It boots from a RAID 5 array of 4x300gb SAS drives. I have just converted some 600gb NetApp drives to 512 sector and they are ...
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Storage Spaces with Parity vs RAID 5 contoller without cache

RAID 5 has gotten some bad rep lately mainly because disks got so big and that in a rebuild case a bit failure on the remaining disks is likely. Nevertheless, I'm curious about something: I read that ...
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Data recovery from RAID5 volume managed by hardware controller

I am attempting to salvage as much data as possible off a failed 12 TB RAID-5 volume comprising 4 x Western Digital WD4000FYYZ 4TB hard drives in an OWC RAID enclosure that is based on the Oxford ...
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435 views

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 ...
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Swap failing drive on ProLiant with P410

On an old HP SE316M1R2 (Same machine as the much more common ProLiant DL 160 G6) I have a 4x450GB Raid 5 array handled by the stock P410 Smart Array controller, fw ver. 8.40.30.00. Drives are genuine ...
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Newly added drives do not appear in the raid array list (hp server and ESXi)

I recently added two physical drives into my hp server (port 2). I also add them to the raid array list, but they don't appear in it: and: How can I add Disk 5,6 to the raid5 array list? is ...
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Create RAID 5 with 2 new and 2 data disks without losing data [closed]

I would like to create a RAID 5 for my file storage. For that purpose, I currently use 2 drives without any RAID configuration. I would like to upgrade to a RAID 5. I want to add 2 new (and empty) ...
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RAID 5 virtual disk still shows up as degraded after repair

On a machine running Windows Server 2012 R2, I have a virtual disk consisting of 8 physical disks in a RAID-5 configuration. One drive died, so I replaced the dead drive and followed these ...
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mdadm raid5 was added as a spare to itself

I have a raid 5 device created with mdadm. I was working on it and long story short, I wanted to type mdadm --manage /dev/md127 -a /dev/sdd, but I accidentally typed mdadm --manage /dev/md127 -a /dev/...
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Create Storage Spaces Parity RAID Using Powershell

I have an external USB enclosure that is presenting the physical disks to my Windows Server 2016 operating system with identical UniqueIDs. As a result, I cannot use the Server Manager > Storage ...
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Access clean RAID5 on new machine using 2 of 3 disks

A server of mine is dead. On the server I had 3x disk with a software raid on the second partition of every HD. Now I have inserted two out of three HDs in a PC (no place for the third!). Here what I'...
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Remove Raid Memory from HP DL380 G7

Hello, i have a problem in HP G7 raid memory and need to remove it i have Raid-5 array configured in this server but no cache configured what will happen when remove the memory ? is the raid-5 ...
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How to scrub or clean out company data before selling server

I'm looking to sell a used Dell Poweredge T310 server (Specs at the end) with Server 2008 Standard SP2 and MS SQL Server 2008 R2 on it. I'd like to sell the server as-is, with the OS and installed ...
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Replacing hard drive in RAID 5 array on HP ProLiant DL380p Gen8 Server

I'm a relatively new (and the only) system admin at my organization. We have an HP ProLiant DL380p Gen8 Server that is no longer under any sort of support contract from HP. We're using it as a Hyper-V ...
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122 views

Recover data from RAID 5 with VMFS data store

I own an HP Proliant Gen-6 ML350 server which is not turning on again after a power outage. According to my research it is most likely due to a failue of the power supply backplane or the power supply,...
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RAID 5, 2 out of 4 disk drives are foreign

I am in hot water and badly need help. Server Machine is Dell PowerEdge r730. It has 4 hard drives of 1TB. RAID 5 was already configured (Not by me). Now I see this screen at startup. When I ...
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PERC H330 or Windows Storage Space on Raid 5

I'm trying to build a raid 5 array for our file server using the following: 1. Dell Poweredege R530 - server 2. Windows Server 2016 - OS 3. 3x 4TB SAS - Hard Drives 4. PERC H330 mini - embedded ...
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HP P840 HDD RAID 5 many strange drive failures

I've been using a RAID5 HDD storage (8x6TB) at my HP P840 for like 2 years now and it has always had unusually many drive failures. Everything was good for half a year, but now drives are failing in a ...
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Why has open-iscsi two times slower writes than Samba via 10G Ethernet?

On my local file server I have raid-6 on 7x HDD drives. dd if=/dev/zero of=tempfile bs=1M count=2048 conv=fdatasync Local speed test gives me 349 MB/s write speed. Remote writes to Samba from SSD (...
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Does KVM/QEMU support mdadm RAID5 properly?

I'm not able to get anything close to usable performance using a guest file located on a mdadm RAID5 array. I've believed I optimized all the parameters of the array and filesystem for best R5 ...
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SCSI RAID 5 configuration probabbly lost: is it a good idea to write-protect disks?

I need to restart a Dell Precision 670 server that includes a Dell 320 / DC SCSI RAID adapter. The server was shut down for 7 years and the BIOS setup was lost. I have 3 disks configured in RAID5 (...
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143 views

I have a RAID 5 array 3 HDD's in the array + 1 dedicated hot spare…Drive failed and the hot spare is rebuilding

Total of 4 HDD's 3 in the array and 1 as the dedicated hot spare HDD#1 Failed and the hot spare automatically began Rebuilding I would like to replace HDD#1 but I am curious about the procedure to get ...
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142 views

Unable to use/mount the full size(20TB) of configured RAID5 array on centos7

Actually i have created software RAID 5 array md0 using mdadm linux. In this configuration i have used 6 Harddisk (4 TB each) and the final raid5 array size is 20TB approx. As we know raid 5 use n-1 ...
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mdadm RAID5 random read errors. Dying disk?

First the long story: I have a RAID5 with mdadm on Debian 9. The Raid has 5 Disks, each 4TB of size. 4 of them are HGST Deskstar NAS, and one that came later is a Toshiba N300 NAS. In the past days I ...
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362 views

Unable to mount a RAID 5 volume

Evening all, Total n00b when it comes to Linux, I use Xpenology (Synology) as NAS software and following a faulty SATA cable lost my RAID 5 volume - within the OS it's sat in a crashed state. ...
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424 views

Recover from a clean, degraded RAID-5

Good morning all, I have some NAS software which - for the most part - works great, but when something happens to the Hyper-V host it often fails spectacularly. Today is one of those days. I'm not ...
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262 views

MegaRAID SAS 2108 - Can I use different drives for the same array

I know you can in general use different drive manufactures and size in general but does anyone know if the MegaRAID SAS 2108 card will let me do RAID 5 with multiple drives that are not the same in ...
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I/O Lockup after RAID5 Volume finishes synchronising

I have a Windows Server 2012 R2 box with a software RAID5 volume (4x 4TB) but for the past few weeks I've been having relability problems with the server where all I/O locks up and I'm forced to reset ...
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Recovering formatted Microsoft Storage Space Raid-5

I have accidentally formatted my Storage Space. The setup is 3 units of USB 3.0 Hard drives with 4TB each. Total 7.4Tb of storage available. I have used Active File Recovery with no success.It finds ...
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87 views

Poweredge 730xd Replace RAID 5 disk with alternate model?

I have a Dell Poweredge R730XD with 24 x 1.2tb ST1200MM0088 (2.5, SAS 12Gbp 10K) disks in multiple raid 5 partitions. One disk has failed - I have a brand new ST1200MM0099 disk available to replace ...
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77 views

highpoint rr640l raid 5 status disable, having difficulty with recover

I have been using a Highpoint RR640L controller (at BIOS version 1.5) for a couple years or more on my primary system. The RAID-5 volume contains 4 disks, 2TB each. This week, one of the disks ...

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