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Questions tagged [raid6]

RAID6 is a method of configuring fault-tolerant hard drive storage. It is similar to RAID5, but differs in that it writes two sets of parity information, thus can survive the simultaneous failure of two hard drives.

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Raid6 hdd compatibility

Looks like the golden day of hard drive failure has come for my raid6 configuration. I have a nas deluxe NDL-2810R, with Silicon Image Inc. SiI 3132 Serial ATA Raid II Controller, and 8 ST5000NM0024-...
cz.steve's user avatar
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HP P440AR version 7.0 with Samsung 870 1TB drives - RAID6 esxi 8.02

I have a ProLiant ML350 Gen9 with P440Ar Raid controler, on which i added 6 Samsung 870PRO 1TB drives and put them into RAID 6 configuration with additional SSD drive with esxi 8.02 Everything went ...
Lonko's user avatar
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Ubuntu 22.04.3 LTS running mdadm 16 x 8TB Raid 6 - Is it possible to upgrade individual disks and use the space immediately without using LVM?

Some more background... I have 4 realtime arrays (always running for me to use) - the 2 big important arrays (40TB [20TB used] and 112TB [105TB used] are being backed up onto a 16 x 8TB Raid6 array (...
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Is it possible to get a RAID array to rebuild on disks in different bays?

I have a RAID-6 Sata SSD array running on a new HPE Smart Array P408i-a SR Gen10. Unfortunately, two of the bays in the new server have failed, leaving us in a very precarious situation. We have moved ...
mwfearnley's user avatar
3 votes
1 answer
419 views

Adding a disk to an existing RAID fails with "disk doesn't have enough capacity"

I have a very old physical server using many disks in a number of RAID6 group. Those disks are not in the same chassis, instead is a JBOD system connected through the RAID controller on this server. ...
Heelara's user avatar
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Upgrade from SATA to SAS: Expected speedup?

My current setup is this: Megaraid 9361-16i 12 x 12 TB SATA disks WD DC HC520 Connected to the controller via 3 of the 4 SAS ports Configured either Raid-10 or Raid-6 without spares. Raid-6 in write-...
Homer512's user avatar
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RAID6 REBUILD - Virtual Drive not importable

Good morning, Last week, the heatsink of our LSI9271-8i Raid card dropped off from the card and the card is dead. It is an 8 disk x 10TB (Slot7 is hot spare) RAID6. Well, we have another LSI9271-8i, ...
matabufalez's user avatar
1 vote
1 answer
129 views

md Raid6 array disapeered on reboot

my raid6 array disappeared on reboot after I grew it. I believe the issue was growing 2x with the full disk not partition. It has been suggested a possible other reason the drives were not correctly ...
tjgrillz's user avatar
4 votes
2 answers
1k views

Why does ZFS RAIDZ2 only use 2GB of data when I create a 1GB File

I have created a ZFS RAIDZ2 / Raid 6 file system, which from what I believe will store parity on 2 disks. root@zfs-demo:/data# zpool status pool: data state: ONLINE config: NAME ...
PrestonDocks's user avatar
13 votes
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RAID 6 array, one disk rebuilding?

I have got a 10 disk (16 TB) RAID-6 array (AVAGO MegaRAID SAS 9380-8e) in a Supermicro JBOD enclosure. The controller started beeping today and one disk is blinking red/blue. I entered the AVAGO ...
gha's user avatar
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16 votes
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What's the difference between a "degraded" RAID 6 array and a "clean" RAID 5 array?

Suppose you have two RAID arrays, one with N disks and one with N+1 disks. The array with N disks was formatted as a RAID 5 and left alone, while the other array was formatted as a RAID 6 before one ...
ATLief's user avatar
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2 votes
3 answers
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Need to recover RAID 6 array

By definition RAID 6 is an array of independent hard drives equipped with two independent and distributed checksum schemes Does that mean I can recover each of the hard drives one by one using ...
Adil Malik's user avatar
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1 answer
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I accidently deleted the partition tables of my RAID6 drives

I accidentally deleted the partition table of 2 drives in my 4 drive RAID6 by reversing the order of sudo sgdisk -R=/dev/sdb /dev/sdz parted /dev/sdb print currently reports: Model: ATA ST2000DM008-...
soundsofpolaris's user avatar
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How do I expand my VD on LSI 9361-16i?

I've got a 9361-16I installed in a supermicro sc847. I have the 2 expanders running in a cascaded configuration with both of them chaining off port 0-4 of the card. They are being exposed as enclosure ...
Zack Lapinski's user avatar
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Need confirmation on how iSCSI RAID storage works

I have a Dell PowerEdge server with Windows Server 2019 that has an iSCSI target set up with 30 iSCSI LUNs. The HDDs are set up in a RAID-6. I have some IP cameras that have the ability to record ...
David's user avatar
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16 drive RAID recommendation on H730P

I have a machine with 16 x 12 TB drives on an H730P controller. What would be the recommended RAID-6 configuration? The drives are of the model Toshiba MG07SCA12TEY I am considering 2x 8 drive arrays, ...
user2956979's user avatar
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1 answer
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Is RAID 6 a good choice regarding performance on server used for computation?

We are operating a server for doing computations with large data sets (100GB - 5TB) for a small group of researchers (10-20 people). At the moment we are running 4x8TB spinning drives in a RAID 6 ...
lumbric's user avatar
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2 answers
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Issue expanding raid6 array using storcli

I've got a RAID 930-16i 4GB RAID card. I started originally with a single vd comprising of 4 x SSDs in RAID6 ------------------------------------------------------------- DG/VD TYPE State Access ...
user13402801's user avatar
11 votes
2 answers
7k views

Windows Storage Spaces - a useful replacement for RAID6?

// short update at the bottom // another update is near the bottom to reply to a suggested edit So, at first I had this idea: Find a virtual driver to set up and use software raid on windows. Result: ...
cryptearth's user avatar
1 vote
1 answer
896 views

Adding an Uncofigured Good drive to an existing drivegroup/RAID setup

I have a machine with a few drives in it. Running storcli /c0 show produces this relevant info, et.al.: TOPOLOGY : ======== ---------------------------------------------------------------------------- ...
Jarmund's user avatar
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3 votes
1 answer
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How is the HPE SSA "remove drives" command supposed to work to shrink an array?

I have an HPE ProLiant DL380 Gen9 Server with 15 internal 8TB SAS LFF drives, in a RAID6 configuration through an HP Smart Array P840ar controller. It contains a single 94.6 TB Logical Drive [Size: ...
interplanetary's user avatar
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What would you call this "RAID" ? RAID 1+6? [closed]

I have Snapraid running as snapshot RAID6 (2-parity disks) for my 9 disk array which calculates new parity once a day. Then I have Drivepool duplicating certain very important folders on the array to ...
Osjur's user avatar
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1 answer
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How to Add Another Physical Drive to Adaptec maxView RAID6 Logical Drive

I have an ASR71605. I've added another drive to the controller which shows up in max view as ready. The logical drive is RAID 6 with 5 drives in it now. I'm adding this additional drive which is ...
James Hancock's user avatar
3 votes
1 answer
283 views

HP Smart Array P812 - Why is my Raid 60 gone?

I've got an HP ProLiant DL380 Gen7 with a Smart Array P812 which is connected to an MSA20 that houses 19 600GB drives. After my VMs didn't boot up, I checked my array config and 2 drives failed: =&...
Canonip's user avatar
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1 vote
1 answer
514 views

RAID-6 write I/O degrades over time

I've setup a Linux system with RAID-6. Sequential write I/O performance is initially around 600 MiB/s after a reboot, but degrades to between 0.5 MiB/s and 2 MiB/s after the system has been used for a ...
Robert's user avatar
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3 votes
1 answer
4k views

Upgrading RAID6 drives with larger capacity (Best practices)

I have been tasked with upgrading an existing RAID6 array with new disks. Currently we have a 6 disk setup with 1 hot-swap. This is inside a Dell R340 with a PERC H730 Mini controller. I have not been ...
David Whitcomb's user avatar
1 vote
0 answers
56 views

How can I find a broken disc?

I have a problem. I got 1 broken disc in RAID6. How can I find which one broke down? I've tried # cat /proc/mdstat <--- to check condition of raid. I want to know if this command mdadm –...
kernels's user avatar
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6 votes
1 answer
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How to recover mdadm raid6 array? mount: can't read superblock. 8/13 drives show all drives present, 5/13 drives show only 5 drives present

I rebooted my server today to find it hanging. I commented out the entry in fstab that loads /dev/md0 and the machine proceeded to boot. The raid was accessible and working prior to the reboot, I only ...
Jieiku's user avatar
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1 answer
960 views

Ceph - Erasure Coded Pools - Always get inactive pgs

I'm trying to achieve similar thing to raid6 on ceph. But When I'm creating erasure coded pools (k=3 + m=2(or k=4) ) I always get inactive pgs. ceph health details are: HEALTH_WARN Reduced data ...
Lisek's user avatar
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1 vote
1 answer
230 views

Extend root partition for XenServer 7

The situation: We have a 6 disk RAID6 array in our server. We forgot to keep a bigger space for the root partition and used up all remaining space. Now, if we extent the array with +1 disk and ...
Bert's user avatar
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120 views

Expanding Perc 6/E Raid 6 while in use - Can this cause data loss?

There seems to be a lot of information on the 6/i controller but not 6/E. The Dell manual has bit of information on converting from one raid level to another but it does not specifically answer my ...
Eric Snyder's user avatar
3 votes
1 answer
330 views

(Why) Does lvmraid6 need 5 drives?

I'm investigating using LVMRAID instead of MD+LVM. In my case, I'm looking at a RAID6. As expected, the docs say you need N+1 devices for RAID5, and a minimum of 3 drives. The docs say for RAID 6 ...
tudor -Reinstate Monica-'s user avatar
-1 votes
1 answer
2k views

Windows Server 2012/2016 simulated RAID6 in software with 4 disks

Does anyone know how to emulate RAID6 in software on Windows server using 4 disks? The solution must provide for the failure of any two disks (like RAID-6 in Linux). Thank you, Joe
user308958's user avatar
0 votes
2 answers
1k views

Can I make an Active Spare disk permanent?

We have a ProLiant ML350P Gen8 server with a P420 controller running ESXi 5.5. It has a RAID 6 array using 7 disks. One of the disks got marked as Predictive Failure, and in response to this we ...
mwfearnley's user avatar
2 votes
4 answers
1k views

RAID6 failed instantly and switched to RAID0 - any chance to rescue?

I´m running a server ob Ubuntu 16.04. Data storage on this system uses a lvm on top of a software raid 6 whereas the os is installed on a separate raid 1 with lvm. The raid 6 is built up of 7 ...
grelog's user avatar
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4 votes
1 answer
1k views

XFS very slow on LVMed Raid 6

i have a new storage server with 6 x 8TB WD Red HDDs. They build a RAID 6 with mdadm and a chunk size of 256k. On top of that mdraid i have LVM which then holds the different filesystems. Initially i ...
teissler's user avatar
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0 votes
1 answer
398 views

QNap Nas-Finding drive order for Raid 6

I have a Qnap 10 bay Nas that had two separate raid setups in it. I know that the Raid6 ran from left to right 1~5 slots, and then the Raid5 ran from slots 6~8. They both had hot spare drives in slot ...
CanTai's user avatar
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8 votes
4 answers
6k views

Optimal RAID 6+0 Setup for 40+ 4TB Disks

I am setting up a JBOD containing 44 4TB 7200 RPM SAS HDs. I chose RAID 60 as I prefer drive failure protection over the performance improvements offered by RAID 10. My issue is how to choose the ...
Vince's user avatar
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3 votes
0 answers
529 views

What could go wrong with ext4 on LVM on a hardware RAID6?

Intro Recently one of my systems using ext4 on LVM on hardware RAID6 experienced a disastrous failure. To name some of the disasters: several filesystems failed beyond repair, at least one was ...
PF4Public's user avatar
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6 votes
1 answer
976 views

RAID6 resync with fast writes but slow reads

I'm using Debian Jessie. # uname -a Linux host 4.9.0-0.bpo.3-amd64 #1 SMP Debian 4.9.30-2+deb9u5~bpo8+1 (2017-09-28) x86_64 GNU/Linux And have setup a RAID6. # cat /proc/mdstat Personalities : [...
rabudde's user avatar
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1 answer
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RAID 6 array much faster than my RAID 10 array?

How come my RAID-6 outperforms my RAID-10? Docker container on Synology with 8x4TB RAID-10: [root@centos Files]# bonnie++ -d /Files/tmp -r 16G -s 32G -n 1 -f -b -u root Using uid:0, gid:0. Writing ...
ujjain's user avatar
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249 views

grwoing raid 6 using mdadm failed - how to undo?

so I have a raid 6 array in my server. Until yesterday, it comprised 11 devices each the size of 1TB. These devices have been running in a raid 6 array. Yesterday i tried to extend the array: Added ...
Stephan Richter's user avatar
0 votes
2 answers
783 views

RAID 6, 2 disk fail, while third was rebuilding

I have Infortrend DS S16E-G2152-6 NAS, 16 4TB drives (WD4000FYYZ) in RAID 6. Last week one drive failed, was replaced and was rebuilding. At around 80% of rebuild, another two drives failed ...
b4d's user avatar
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0 votes
1 answer
197 views

mdadm reshape raid6 does not start

Trying to make myself familiar with some of the raid management options before using the actual devices. So I am working with a few small partitions on a USB-stick. The goal is to extend an existing ...
MechEng's user avatar
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0 votes
1 answer
548 views

After creating RAID6 unit mkfs.xfs takes forever

We have a computing cluster with a relatively large storage system with RAID-6. The are 22 disks in this unit and each disk is 3TB (almost 20*3=60 TB). Recently many of the drives failed and rebuild ...
Lawless's user avatar
0 votes
1 answer
279 views

Poweredge R715 with H700 & SATA drives

I am taking a class that is all about configuring and deploying physical & virtual servers. So as to be able to do this more readily I bought a bare-bones Dell Poweredge R715, 2 Opteron 6276s, ...
NameUnknown's user avatar
0 votes
1 answer
962 views

Setting up RAID monitoring on Hetzner server

We are using Hetzner server for our application which is build in Elixir Phoenix. when I do lspci | grep RAID then the results are 02:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID ...
Junaid Farooq's user avatar
4 votes
2 answers
1k views

Linux mdraid RAID 6, disks drop out randomly every few days

I have some servers that run Debian 8 with 8x800GB SSD configured as RAID6. All disks are connected to a LSI-3008 flashed to IT mode. In each server I also have a 2-disk pair as RAID1 for the OS. ...
junior_h's user avatar
2 votes
1 answer
1k views

How to create degraded raid6 array using megacli

There is a server with few disks. And - a new server with PERC controller. I would like to migrate existing data into a new server to raid6 which uses 6 disks(4+2). Unfortunly - i don't have enought ...
undefine's user avatar
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-1 votes
1 answer
86 views

Which raid array will be best practices with seven 1.2 tb hdd system

I have a server which have seven 1.2 tb hard disks. I have to create raid array but i don't decide which raid i use? First of all, first and most important matter is security. At any cost i must not ...
cem's user avatar
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