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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Recovering data from a Dell MD3220 array after both controllers have databases that were corrupt

I have been working on trying to restore data from an array created on a Dell MD3220 PowerVault storage unit. On the phone with Dell and another support group for weeks now and running into brick ...
Arvo Bowen's user avatar
1 vote
0 answers
369 views

mdadm RAID: Stuck at 0% Grow (Shrink) reshape due to bad geometry

I have a linux software Raid5 array (md1), containing 4 x 16TB + 2 x 8TB hard drives. 2 x 8TB hard drives were merged together (Raid0 array; md0), working as a (fifth) 16TB device. This is just for ...
Konstantin's user avatar
0 votes
1 answer
690 views

Have to manually build RAID array every boot and cannot add third drive - MDADM

I have a RAID1 array that I've had to manually rebuild every time the system boots for a long time. Never had time to figure out why. This is the command I've been using to rebuild it every boot: sudo ...
Gradyn Wursten's user avatar
0 votes
1 answer
464 views

Can RAID 5 be made, when one or more of the disk is actually RAID 0?

I have this question since (I think) 3 years ago, but since I was never actually planning to build server, I just shrug it off. But tonight, I literally can't sleep because of this burning question. ...
Rinaldo Jonathan's user avatar
1 vote
0 answers
5k views

mdadm : Cannot open /dev/sda: Device or resource busy

I have 3 pendrive and I want to use for raid 5 When I run this command I get this output sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sda dev/sdb /dev/sdc mdadm: layout ...
TheCeylann's user avatar
1 vote
1 answer
393 views

disks for a small esx-host: ssd raid5 or hdd raid10? [duplicate]

I am about to replace an ESXi host that runs some 20 VMs (mostly idling). Today around only 800Gb is used on an external iscsi-box, raid6 (total 7Tb). The new server will just simply have internal ...
Alexander Kolodziej's user avatar
-2 votes
1 answer
452 views

Recover data from failed RAID 5 Dell Poweredge T710 Server [closed]

Very important data on RAID 5 array on poweredge T710 server - how can I get the data back? Willing to spend money to do it (eg buy a replacement system and swap the disks in), would prefer not to ...
user2330237's user avatar
1 vote
1 answer
236 views

LXD on ZFS on LVM on H/W RAID 10

I have a Dell R540 with PERC H730P running RAID 10 over 12 DISK to the tune of ~22TB. I want to run various applications/services in LXD containers. I understand that ZFS is preferred for LXC storage ...
simonw's user avatar
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0 answers
462 views

Properly Configuring Grub for a Two-drive raid1 to Support Boot After a Drive Failure

Edit: So, I think the question still applies below, but I realized that the system is actually booting on the second drive, it's just missing /home, /boot and /etc/fstab. I am sure there is more ...
Will Roberts's user avatar
0 votes
1 answer
33 views

Separating /boot from the rest of the System

I have a theoretical system configuration question; If I build my system on a software RAID1 but put /boot on a USB.. could there be problems if the RAID becomes dirty? The setup would be as follows: ...
Will Roberts's user avatar
0 votes
1 answer
496 views

How to configure notification on degraded RAID? [closed]

I am planning a RAID1(mirror) array in a NAS using either a Hardware or Software RAID controller using Linux. Though I did not find any documentation in which way the system will notify me that the ...
Alex's user avatar
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1 vote
1 answer
1k views

How can I migrate soft RAID array made by mdadm to new server and new OS?

I have a RAID array which level is raid0 and made by mdadm, in my old server. The member of this array is 6 NVMe SSD, and I create this array with below command: sudo mdadm -C /dev/md0 -l 0 -n 6 /dev/...
fajin yu's user avatar
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1 answer
187 views

RAID drive - Mechanical Positioning Error

We've just had a RAID drive go offline. There were no log entries indicating failure prior to 'Mechanical positioning error' - six 'Peripheral device write fault' entries were logged after, and before ...
gchq's user avatar
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1 answer
160 views

Dell T610, Perc H700, Netapp Savvio 600G SAS drives - unable to create any RAID

Trying to create a new Raid 10 VD using 4 x Netapp Savvio 10K 600G SAS drives (2.5) fails. After creation the vd/drives enter into failed state (immediately), and I am unable to initialize the VD. I'...
Michael Mussulis's user avatar
-1 votes
1 answer
1k views

8 x 15k SAS hdd disk with raid 0 performance vs single SSD disk for database [closed]

Which one has a better performance for database application (e.g. postgres) if we just consider read/write operations speed and not fault tolerance 8 x 15k SAS hdd disk with raid 0 single SSD disk
Ali Eb's user avatar
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1 vote
2 answers
2k views

mdadm - cant read superblock - can I zero the superblocks without erasing data and recreate a raid?

Today I had to fix a Server Fan by disassembling and rebuild it. After booting the server I had the problem that all disks where not at the same location they have been yesterday. So the system ...
G4nja Wizard's user avatar
1 vote
0 answers
331 views

HP server is replaced and RAID 10 started rebuilding

We've server HP Proliant DL360p Gen8 which was recently replaced with HP Proliant DL380p Gen8. Both have same P420i Raid controller. We setup RAID 10 on DL360p, 4x500GB where 1000 GB 1 Logical Drive. ...
adeel's user avatar
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4 votes
1 answer
1k views

Linux mdraid resync speed on 36 drive array

I have some performance issue with mdraid. I have one 18x10TB soft raid6 array that is resyncing at ~70MB/s: kernel 5.8.13-1.el8 /dev/md0: Version : 1.2 Creation Time : Mon Oct 5 15:...
forke's user avatar
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0 answers
157 views

RAID 5 Data Recovery (Missing Partition)

I really need help. I am running an XCP-NG server, with an LSI MegaRAID 9260-8i card installed. I have a RAID 5 virtual disk with one partition on said disk that takes up all the space. That partition ...
james's user avatar
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1 vote
1 answer
453 views

How to delete an inactive RAID array - Centos 6

I have recently resized a logical volume group and a logical volume to fit into a RAID-0 configuration on Centos 6.10 system. Everything seems to be working fine. However, the disk utility shows two ...
Jack BeNimble's user avatar
0 votes
0 answers
417 views

Synology NAS Volume Crashed - SHR RAID

I have synalogy DS414j with 4 WD disk ( each of size 3726 GB ). I have 1 volume with Synology Hybrid RAID with capacity of 10.82 TB ( 10.67 TB Used) One of the disks (Disk 1) was not being detected ...
Gaurav Shah's user avatar
1 vote
0 answers
161 views

Raid controller can't erase RAID config

I bought a Dell PowerEdge T320 that came with 2 1TB HDD and I just ordered 6 more used 3TB HDD. When setting up an array I'm able to see the original 2 HDD that came with the server but the 6 used ...
develop1's user avatar
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2 votes
1 answer
193 views

mdadm partitions gone after reboot

I had a RAID 6 setup in Cockpit UI with multiple partitions. There was one partition in particular that I wanted to extend from 10TB to 11TB using available space and attempted on /dev/md127p6 using &...
Jacob's user avatar
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2 votes
3 answers
2k views

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
1 vote
1 answer
486 views

LSI CacheCade Pro 2.0 with four SSD cache?

I'm trying to configure CacheCode Pro 2.0 on a LSI 9260CV-8i SAS RAID controller with four SATA SSDs. I've been running CacheCade with two SATA 400GB SSDs with no problems for a while. The CacheCade ...
AC-DC's user avatar
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5 votes
6 answers
7k views

RAID 1, vs RAID 6 vs RAID 10. What is most secure and reliable for my needs?

Here is what I need to achieve. I have a work PC with 2xSSD one for O.S. and software, and the second smaller for storing data. Currently I backup my data on an external HDD and on the cloud, I also ...
S. W. G.'s user avatar
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1 answer
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Recover Linux RAID1 - FAT32 but shows ext2, can't assemble, but shows backup superblocks...I am STUCK

I have 2 physical disks in linux RAID1, I am not sure what happened, I think someone who should not have been in the system partitioned the md0 by mistake while the system was running while trying to ...
Rob's user avatar
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2 votes
0 answers
2k views

How to mount existing Intel RAID ISM (RAID 0) device on Linux?

I have two 1TB drives from 2011 that I need to get the data off of ASAP. Both of these drives are working and were configured as RAID 0 under a Windows Vista machine. Both drives are plugged into my ...
eccomassimo's user avatar
0 votes
2 answers
2k views

Mount a HDD from a RAID to recover some data

I'm struggling to mount a HDD from a Synology DS214 RAID1 on my computer to backup some data from it. I can't mount directly because this HDD come from a raid mount /dev/sda1 /mnt mount: unknown ...
VHUSB's user avatar
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0 votes
0 answers
747 views

How do I measure the read/write speed of a hard drive in a RAID5 array?

I have created a 3-drive Linux RAID5 (md) array out of brand new Seagate Barracuda drives. I can measure the performance of the whole array by using: ioping -s 8k -c 10 -D -W ., where the current ...
sherlock's user avatar
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0 votes
2 answers
153 views

Add disk to QNap Raid 5

I have a QNap TS-569 Pro configured with Raid 5 of 4 hard drives of 1 Terabyte each. It has 5 disk slots and I want to increase the size of the Raid of another Terabyte. Reading the manual seem pretty ...
amicoderozer's user avatar
2 votes
1 answer
2k views

Rebuilding an inactive RAID5

I have a 7 x 14TB RAID5 in my workstation with Centos 7. Last week one of the drives was marked as faulty by SMART (/dev/sde). I used mdadm to mark this drive as faulty and to remove it from the array ...
lalmagor's user avatar
1 vote
2 answers
242 views

Can we connect two raid controllers in standby?

I'm new to server machines and even even installing raid controllers, so pardon me if its too basic question. We have a SuperMicro X10DRH-I Motherboard connected to a raid controller AOC-S3108L-H8Ir, ...
Rishabh Gupta's user avatar
0 votes
0 answers
691 views

RAID5 array is rebuilding after a fresh install of Ubuntu 20.04 Server

I installed Ubuntu 20.04 Server on a system with three Seagate 6TB drives. I have partitioned both sda and sdb in two partitions. The first partition on each disk is of 5G. I combined those two 5G ...
sherlock's user avatar
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0 votes
1 answer
1k views

How to use mdadm to assemble arrays from crashed windows server

I got 12 hard disks from completely crashed server, some of them are failing, too. I successfully saved bit copy of all of them, even not always error free. I found 512MB superblock on each end of ...
schweik's user avatar
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2 votes
1 answer
74 views

Raid 10 - 6 Disk - Dell MD3200

I have 6 disk of 600GB. I'm using a Dell Storage MD3200 , where i have created a disk group ( RAID 10 ) with 6 disks. My disk slots parity are like this: SLOT 1 : 0 SLOT 4 : 1 SLOT 7 : EMPTY SLOT ...
SaroBeatbox's user avatar
0 votes
0 answers
41 views

Expanding RAID volume on PowerEdge

I have a PowerEdge T620 and R620 with RAID5 volumes on Perc H710P controllers. Can these be expanded in place with no data loss by adding additional drives? I have seen this demonstrated online, but ...
jbbarnes77's user avatar
1 vote
2 answers
579 views

ML380 G6 P410i RAID controller not detected [closed]

I have a DL380 G6 server With P410i Array controller (embedded) 256MB Cache, no battery When I turn off the server, then turn on after ± 5 minutes, the RAID controller is not detected (not drives, the ...
Edwin Infante's user avatar
3 votes
1 answer
1k views

e2fsck cleans a filesystem and then a few minutes later (after a lot of reads) there are errors

The filesystem is on an LVM RAID5. It appears to be working correctly: $ sudo pvs [sudo] password for jrwren: PV VG Fmt Attr PSize PFree /dev/sda2 datavg lvm2 a-- <7.28t ...
jrwren's user avatar
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0 votes
2 answers
212 views

RAID0 on 16 8TB HDD's writes at speed 3-4 MB/s only

I have a pretty modern RAID hardware for this: Controller: Intel RS3SC008 SAS Expander: Intel RES3FV288 HDDs: Seagate ST8000AS0002-1NA17Z For the moment, I don't have BBU, which should be Intel ...
Bart's user avatar
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-1 votes
1 answer
325 views

Is it possible to "undo" a raid1 configuration

How can I reconfigure a raid1 so that it is not raid1 anymore and without loss of data? I do not want raid. I find myself with a server with predefined images that have a software raid1 setup. My ...
Ely's user avatar
  • 150
5 votes
1 answer
1k views

What is the source of syslog message "Condition check resulted in MD array scrubbing"

On an Ubuntu 20.04.2 server with a software MD raid, exactly once a day when the system is doing its daily activities, the following message is output to the syslog: systemd[1]: Condition check ...
Marcel's user avatar
  • 53
8 votes
1 answer
2k views

Does one failed drive + one single bad sector destroy an entire RAID 5?

During planning my RAID setup on a Synology Disk Station I've done a lot of reading about various RAID types, being this a great reading: RAID levels and the importance of URE (Unrecoverable Read ...
adamsfamily's user avatar
0 votes
1 answer
187 views

How to make an 8TB protected SHR from a 4TB unprotected SHR (Synology Hybrid RAID)?

I have a 2-bay Synology Disk Station (DS220j) with a single 4TB Drive in it. There is a SHR Volume 1 on the system. It's currently without protection but it was prepared for another 4TB drive to be ...
adamsfamily's user avatar
0 votes
1 answer
896 views

How can 2TB drive give protection for 12TB of data in a SHR (Synology Hybrid RAID)? [duplicate]

I used the Synology RAID calculator to model a scenario of a mix of a bunch of 1TB and 2TB drives. Could someone explain to me how is it possible that 2TBs of redundant space give protection for 12TBs ...
adamsfamily's user avatar
2 votes
0 answers
97 views

Debian/Linux weird mdraid state

Why is md1 state UU, md0 is U_ and md2 is _U? nvme1n1 is broken here. Can I safely replace nvme1n1 now? You can see md2 state, nvme0n1p3 seems removed but nvme1n1p3 seems active. How can I safely ...
mrv1337's user avatar
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0 votes
1 answer
1k views

How do I get a normal disk going (PERC H710 Mini) with perccli?

https://i.stack.imgur.com/kSQan.jpg https://i.stack.imgur.com/9utPQ.jpg I have a Dell PowerEdge R720 which boots up and has 1.7 TB of drive space but I can't seem to get any of it and use it. When I ...
Andrew Arrow's user avatar
0 votes
1 answer
650 views

What happens to the disk data if the disk is made RAID ready?

I have a PERC H730P mini RAID controller. I have a single physical (non-raid) disk with important data which I falsely executed as "Convert to RAID capable". Apart from this, I haven't done ...
Nimrod's user avatar
  • 1
0 votes
1 answer
384 views

HDD with SSD Cache to RAID6?

We got 8 HDDs in our server (Dell PowerEdge R730), combined as a RAID6 array. Yesterday evening one of the drives failed, so we are looking now for a replacement. I've found the Seagate Exos E 10E2400 ...
Dominik's user avatar
1 vote
0 answers
95 views

Disk parameters for kubernetes

I'll be setting up some baremetal machines to form a k8s cluster. They each have 2 disks to be configured as RAID1, my question is what is the optimal values for stripe size, read and write policies ...
Nyquillus's user avatar

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