Questions tagged [raid]

RAID, an acronym originally for Redundant Array of Inexpensive Disks (today usually interpreted as referred to as Redundant Array of Independent Disks), is a technology that provides increased storage performance and reliability through redundancy by spreading data across multiple disks using various algorithms (RAID-levels). RAID can be implemented in hardware storage controllers, or in software, usually as operating system/kernel features.

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Transferring RAID1 to a new motherboard after HDD failure, and no "Superblock" found

First an OS SDD failure followed by a mobo failure, new mobo/cpu/ram later, and I have a RAID1 with a single working disk, and I am trying to get it remounted so that I can add in a new replacement ...
Aslan French's user avatar
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1 answer
563 views

Extend RAID volume size with storcli

I have RAID1 on 2*240GB HDD , witch i changed with 480GB SSD's. I changed disk 1 , wait for RAID to rebuild, and then change the other. Now I have 240GB RAID over 480GB disks, and cant find a way to ...
5KO's user avatar
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155 views

Raid6 mdadm reshape operation interrupted - now cannot mount or examine

Edit: Once the reshape finished the drive became fully accessible again. I had a power failure while a raid6 array was being reshaped, and now certain operations cannot be run against it, including ...
Jonathan Cremin's user avatar
1 vote
1 answer
252 views

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
0 votes
1 answer
169 views

Can't connect to other volumes (Dell Equal Logic SAN Headquarters)

Investigating an older server and disk array (Dell EqualLogic PS4100). The server has Dell EqualLogic SAN Headquarters onit. In Group Manager on the server I can see 5 out of 7 volumes as online/...
strj500's user avatar
0 votes
1 answer
624 views

RAID Disk shows foreign status after being removed and inserted into the wrong slot

First of all forgive me that my understanding of Dell RAID system is limited. I have a dell PowerEdge server with PREC H330 Mini controller with 6 of the 8 slot having a physical drive (each 2.182TB) ...
Biruk Abebe's user avatar
1 vote
0 answers
499 views

Disk performance issues exclusively with RAID 10 (LVM RAID)

For some reason, I am suffering very poor disk performance on RAID 10, but normal performance on RAID 5. For context, I have 4 x 1 TB hard drives in a server. They are the physical volumes within the ...
Marwi's user avatar
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1 answer
291 views

Diagnosing **very** slow write speed on RAID / Fedora 14

We have a Dell PowerEdge T110 running Fedora 14 which operates as our build server for Embedded Linux and as our Subversion server. Recently it has become very slow, failing to complete nightly ...
harry courtice's user avatar
1 vote
1 answer
136 views

recovering raid5 from 3 working drives, one has a read error

i had 4 drives, lost one drive before, and now another drive was reported by the qnap web gui as having a read error (i did a bad block scan). now i want to insert a new drive, in the lost drive's ...
constatinus's user avatar
0 votes
1 answer
290 views

Recovering RAID5 - using Linux "mdadm"

Using Linux mdadm to recover from failed disk / partition. Here are titles of the steps I took so far - I can post detailed copy if it helps. ( I am not sure how to post file link here...) The last ...
Jan Hus's user avatar
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2 answers
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How to create RAID5 with existing data? EFDITED [closed]

Here is the original post There is very ancient post on this forum about adding / creating new RAID5 using EXISTING data on non RAID5 partition. I ASSUME the discussion was pertaining to HARDWARE ...
Jan Hus's user avatar
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1 answer
224 views

Flash Crucial SSD firmware through PERC 730P Mini RAID controller

We've got a number of Crucial drives in Dell r630 servers with PERC 730P Mini RAID controllers that need their firmware updating as they're still on version M3CR032 with the known issues. The servers ...
willdashwood's user avatar
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1 answer
37 views

dell R730xd disk size less then total disk size after raid 0

On my R730xd, I have 6x1TB and 20x 300GB HDDs. That should give me about 12TB. But after I do the raid setup I am left with a 6.8 TB disk? I am doing raid 0 because I don't plan on storing anything ...
D.Zou's user avatar
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14 votes
8 answers
2k views

Linux - RAM Disk as part of a Mirrored Logical Volume

We have a server with 64GB of total RAM, applications are using typically a maximum of 30GB of that available RAM. One of those applications deals with a lot of flat files, and we're having throughput ...
Shayne Fitzgerald's user avatar
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1 answer
36 views

Removed failed disk from

I have a problem with a software raid running mirror. One disk is dead and the server cannot find it. Normally I would have removed it as well. mdadm --manage /dev/md0 --remove /dev/sda1 But after it ...
The Tech Guy's user avatar
0 votes
3 answers
650 views

HP Raid Controller p420i 18TB disk support on DL380 Gen8?

I have some 18TB Seagate Disks on a DL380 Gen8 HP server with p420i raid controller, with 2GB cache module. I have created a RAID5 with 16TB disks but with 18TB disks, all disks are recognized but ...
raitech's user avatar
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2 answers
506 views

Which RAID is best for private use of NAS [closed]

I want to buy the DS 920+ with (4x)6TB Seagate IronWolf NAS HDD. I definitely want some reliability. I obviously don't want to lose any data which is stored on the NAS. Which RAID would be the best? I ...
Franz's user avatar
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0 answers
160 views

Shrink one of the disks in a multi device BTRFS filesystem

My root partition is running out of space and I have no other SATA slots. I have a BTRFS raid0 and I would like to shrink one of the partitions I used for the BTRFS-raid0 and add it to the root ...
berinaniesh's user avatar
1 vote
0 answers
332 views

Running xfs_repair on hardware raid while still rebuilding?

Should I allow a hardware raid5 array rebuild to complete after swapping out a drive PRIOR to running an xfs_repair on the volume? Currently xfs_repair keeps failing in Phase 7 at the same spot: Phase ...
Jebediah Pennywhistle's user avatar
0 votes
1 answer
263 views

Debian 10, very slow disk i/o, related to software raid

Hey got a server here that's gotten very slow on disk i/o, mdstat mentions something about a check, but I can't find anything about that when googling for it. What is it doing here? root@tynix /home/...
Tyron's user avatar
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1 answer
206 views

mdadm array state not fully active - faulty device

I use 4 drives as a raid 5 on my Raspberry Pi. I shutdown my Pi every night and start the next morning. Sometimes the array appears to be faulty. Maybe the Pi doesn't properly mounts the drives ...
RandomGuy's user avatar
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0 answers
142 views

Can I make hotremove/add on raid5 with mdadm?

I created and assembled software RAID5 array (mdadm), 15 SSD disks. If I physically remove several disks and add them back, RAID doesn't assembles back. Disks stays in "spare" mode. Even ...
sin4ez's user avatar
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1 vote
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1k views

mdadm RAID10 disks layout

I've been trying to understand how disks are distributed in a mdadm RAID10, but i'm not completly sure. AFAIK, a native RAID10 is similar to RAID0+RAID1, i.e. data splitted in two chunks, each one ...
Roberto Iglesias's user avatar
0 votes
1 answer
473 views

LVM "not starting" after upgrading physical disks in underlying RAID6 mdadm array

Before: separate SSD boot drive RAID6 4 x 2TB -> /dev/md0 LVM PV /dev/md0 LVM VG built on the PV above LVM 2 data partitions formed in the VG mounted at /home and /mnt/data I upgraded from ...
James Addison's user avatar
1 vote
1 answer
202 views

Poweredge R720 - Unrecoverable Medium Error on boot

I am running Ubuntu 22.04 on a Poweredge R720 using a hardware RAID 5 array. Earlier today the server experienced an unexpected power cut, and upon rebooting I was met with an "unrecoverable ...
hunsbct's user avatar
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0 votes
1 answer
968 views

HDD vs SSD for mongodb database server

I am setting up a physical server for an application that we have developed, the purpose of this server is to run the server's own software and store its database (mongodb). On the server machine we ...
coantia's user avatar
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0 answers
85 views

Added wrong drive to raid1 via mdadm, partition recovery

My raid is functioning fine, but I accidentally added a USB drive to what is a sata RAID1 with mdadm. I noticed this pretty quickly and removed the drive from raid, it was synced about half a percent. ...
loserspearl's user avatar
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Want OS on HDD outside of Hardware Raid

I Work for a tech company. They got rid of some outdated hardware and I ended up with a couple old HP Z800s. one of those has an HP PN XP310AA which is an HP LSI 9212 4-Port SAS 6 Gb/s Internal RAID ...
Chad Parmeter's user avatar
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0 answers
973 views

How do I mount a BTRFS filesystem where both devices have the CHANGING_FSID flag and one devices has journal errors?

I have a RAID-1 BTRFS setup with two 8 TB hard drives. Due to unclean reboots, I cannot mount them anymore, even with recovery flags: rockpro64:~:# mount -t btrfs -o rootflags=recovery,nospace_cache /...
lenny.myr's user avatar
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0 votes
1 answer
141 views

Checking status of RAID on Ubuntu gives inconsistent output

I tried to get status of RAID on Ubuntu using two commands. It appears that the output is inconsistent. Basically I had configured a RAID using two devices and df shows entry for only /dev/md1. I had ...
Sunny's user avatar
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0 votes
2 answers
728 views

Acessing HP Disk Array from Linux

I have some old HP Proliant GL5 with HP P400i array controllers that I want to put to some use. In a small test I have booted with Archlinux, and it was able to list the array card and network ...
Lin's user avatar
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0 votes
1 answer
131 views

How to remove a Raid 1 subgroup from a Raid 10 array?

I have a RAID 10 array with 3 subgroups of drives in RAID 1, like in the image below Raid 10 Is it possible to remove an entire subgroup (2 disks) without losing the entire Array? The RAID 10 will ...
Lucas Castro's user avatar
1 vote
1 answer
313 views

DegradedArray event after removing raid with mdadm

My new server (ubuntu22) from hetzner has 2 ssds and and an additional big hdd that is intended to be used for back-ups only. Initially 3 raids were preinstalled, and the biggest part of an hdd was ...
Kasheftin's user avatar
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0 votes
0 answers
266 views

Unable to Install Linux Mint on RAID

Second week now than I'm trying to setup Linux Mint on software RAID5 without success. I'm able to setup the software RAID5 on the live CD with three 240GB SSD, then the installation setup fails to ...
Guillaume G. Soucy's user avatar
2 votes
0 answers
51 views

Why does NETWORK SERVICE own my RAID?

I inherited a Windows Server Essentials 2016 machine that's set up with a C system drive and a D RAID. The problem is the D drive, on which everything works as expected below the top level. At the top ...
Bill's user avatar
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0 votes
2 answers
2k views

File transfer between servers seems slow

I have two servers both running Rocky Linux v8.4, one hosts a raid drive that I use to back up a (very) large raid drive mounted on Server A as /home. Server A (with the large raid of 70TB mounted as /...
jearl's user avatar
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1 vote
3 answers
698 views

raid 0 made of drives of unequal sizes with mdadm

I want to create a raid0 array with mdadm from 3 physical drives: 8TB and 8TB and 16TB. Is it okay to create 2 8TB partitions on the 16TB drive and simply create the raid0 array from 4 8TB partitions ...
ThomasHunter's user avatar
1 vote
1 answer
1k views

Creating a RAID 1 via mdadm ends with completely filled one of drives after sync

I have a server with 2x 1TB NVMe drives and I want them to work in software RAID 1 (mdadm) as a system drive. After creating and waiting for sync of the array I'm ending with one of the drives in ...
janopano12's user avatar
0 votes
0 answers
22 views

Added drives to raid array, and changed it from 5 to 6 but it looks like I forgot to add a filesystem to them

mdadm --detail output Version : 1.2 Creation Time : Tue Jul 21 15:52:43 2020 Raid Level : raid6 Array Size : 29298912768 (27941.62 GiB 30002.09 GB) Used Dev Size : 9766304256 (9313.87 GiB 10000.70 GB)...
average650's user avatar
1 vote
0 answers
144 views

What can make btrfs device replace fail silently?

In a performance-critical system, we run Btrfs RAID0. We have three devices relevant to this question: /dev/sda2, an SSD that is too small and slow, and limits the size and overall performance of the ...
Pianosaurus's user avatar
-2 votes
1 answer
2k views

Mixing Seagate Ironwolf 4TB ST4000VN008 and ST4000VN006 in RAID5 [closed]

I have purchased 4 drives from Seagate to build a home cloud based on RAID5. However, I occasionally ordered different models: two ST4000VN008 and two ST4000VN006. Now I am wondering, shall I send 8's ...
Dmytro Prylipko's user avatar
0 votes
0 answers
404 views

How to solve a system freeze when mounting a mdadm raid-5 array?

I recently set up a raid-5 array with 4 disks on Ubuntu 22.04. When I try to mount the array using sudo mount /dev/md0 /mnt/md0 the entire system freezes. I can see the desktop but the mouse doesn't ...
oh_cripes's user avatar
0 votes
1 answer
2k views

HP ProLiant DL380e Gen8 - Cant Access Raid Controller

i have a HP ProLiant DL380e Gen8 Server with ah P420 Raid Controller. I have configured Raid 5 with 3 Disks. I want to expand the Raid with 2 more Disks. But i cannot access the Raid Controller -> ...
user avatar
0 votes
2 answers
818 views

How can I regain access to a RAID volume that I deleted from PERC in the Dell Life Cycle controller?

I'm using a Dell PowerEdge R820 with PERC H710 adapter I had RAID 0 configured across two 1TB SSDs, Drive A and Drive B. I recently bought a 5TB HDD, Drive C. Today, I was attempting to create a RAID ...
Not Dylan Burns's user avatar
0 votes
1 answer
213 views

Is running CEPH on public cloud without data replication a good idea?

My startup is thinking about adopting CEPH for block storage (and other features it provides). Most of our infrastructure runs on public cloud (DO,GCP,AWS,etc...). On public cloud data storage you ...
mohamed emad's user avatar
1 vote
1 answer
821 views

ESXi does not show drives for second RAID controller with NVMe drives

I got a second RAID controller (AVAGO 9440-8i) to put in my Dell T440 server (first RAID controller is a H740P). I got the Broadcom U.2 enabler cable and two WD Gold 2TB drives. I've updated ESXi, the ...
boindil's user avatar
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0 votes
0 answers
1k views

How does RAID0 affect IOPS performance for NVMe SSDs?

I have an application which needs to read large amounts of small and randomly distributed entries from storage. To improve the performance I am considering to install a specialized hardware RAID ...
Bobface's user avatar
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-1 votes
1 answer
57 views

Can RAID be accidentally configured twice?

I am renting a server from Hetzner, which had 2x 8TB disks. I believe they were listed as RAID 1 (though can't find anything to confirm that anymore), which I would have assumed would have given me 16 ...
user2141650's user avatar
22 votes
2 answers
5k views

Server motherboard died and took Intel RAID controller configuration with it. How do I recover the data?

Old server using a S1200BTS Intel mobo died and has been sitting in a closet for several years. I replaced the motherboard and found that it was originally configured using an onboard hardware raid ...
Benjamin Jeffrey's user avatar
1 vote
1 answer
175 views

ZFS size discrepency between 2 very similar configurations

I have 20X sata 12TB disks in a file server with a Broadcom/LSI MegaRAID SAS39xx raid controller. It’s running ubuntu. For an performance experiment, I created two storage pools: -A single hardware ...
Thingomy's user avatar

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