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.
Questions tagged [raid]
3655 questions
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Grow mdadm raid from raid1 to raid0 with active lvm
We rented a server with two NVMe disks in a raid1 configuration with a lvm on top of that.
Is it possible to change the raid level to raid0 without making any changes to the lvm config? We don't need redundancy but might need more disk space soon.
I…
Leifb
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Dmesg is full of I/O errors on Ubuntu 18.04 VM, physical disks and host are fine
I have an Ubuntu 18.04 virtual machine on a Windows Server 2016 host (Dell PowerEdge R530, Intel Xeon E5-2620 @ 2.1GHz, 96GB RAM), running in VirtualBox 6.1.10. The host system has 2x2TB HDDs in RAID 1 via a PERC H730 Mini controller. The VM runs an…
Marcell Bernát
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On a Proliant DL380 G7, how can I identify which drive in the RAID is making a clicking sound?
I have 8 drives in the Proliant G7, and when under disk load there is a clicking sound from one of them.
There are NO SMART ERROR MESSAGES.
It is running ESXi, which shows warnings about i/o latency increasing (sometimes to multiple seconds) on the…
youcantexplainthat
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PERC H740p single-disk RAID 0 versus JBOD/Pass-Through/eHBA/IT mode (For ZFS on Linux)
We have a server with PERC H740P mini (embedded) and a 2 disk RAID 1 with EXT4 for the OS (CentOS 7.8) and a 6 disk raidz2 ZFS on Linux setup for the data, all on the same controller.
It's generally considered bad® to run ZFS with HW RAID, but this…
sed_and_done
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BTRFS and coping with disk failure
I'm finding the information for this quite difficult to come by, but it seems like an important feature of a RAID system: what happens immediately after a disk fails for BTRFS?
For my hardware RAID systems, I'm alerted to the fact that a disk has…
Christopher Causer
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How can I know if one disk faults on RAID 5?
I have 4 x 8TB configured on RAID 5, as it is if one disk faults the system can survive. But if more than 1 disk faults, the system will be destructed. How can I check if one disk is already faulted so that I can back up?
That does not deliver that…
Van Gogh
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E-mail reporting issue for RAID on DELL servers
On the server of one of our clients, we have a problem with the implementation of email reporting for RAID in the DELL server. I know that if such a server has an iDRAC port, such reporting can be performed.
However, the server that has the client…
user620055
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About IOPS of a RAID5 disk array without cache
we are using a 530-8i RAID adapter,which is none-cache supported, on a Lenovo ThinkSystem SR590 server.And we have 4 HDD(600GB/10K RPM/SAS) in the array.
I read an article about calculating the disk/disk array IOPS,our disk array should get IOPS…
Jason Yang
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Is there a list of linux compatible RAID/HBA cards?
I purchased an LSI Logic HW RAID controller on ebay without doing much research and discovered the hell of 10-year old proprietary drivers and command line tools with no documentation. I'd like to avoid that experience again, and so I'm looking at…
bweber13
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md raid5 extremely slow on discard
Hi all md raid experts
Running Centos 8 (with all latest updates, kernel 4.18.0-240.1.1.el8_3.x86_64) where I have 3x2T Samsung SSD 860 QVO 2TB in raid5 (to be used as base for some KVM VMs) and when I do something that involves discard it's not…
lpaseen
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Does IDs from `ls -l /dev/disk/by-id` output are unique to a disk? - DELL PERC card
Does output from ls -l /dev/disk/by-id can be used as a universal disk identifier?
I am currently trying to find a unique identifier that I can use to create a ZFS raidz pool using a unique identifier for each disk.
Potentially I want to use the…
Lucio Queiroz
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Help choosing a PERC RAID card for a MD3000
I'm trying to select a PERC card to use with a PowerVault MD3000 (15 drives in RAID5). Is the 5/E the only card compatible with the MD3000 on sale by Dell at the moment - or are there newer better options?
Mr. Flibble
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Replace healthy drive in RAID 10 on PERC H730
I have a PowerEdge T630 of a few years with a hardware RAID 10 consisting of 4 1TB disks.
Now I need to extend the storage, so I have ordered 4 additional 1 TB disks which i planned to add in a new virtual disk which I'd then add it to the LVM.
All…
Jan
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What's a good RAID config for a CMS server?
A customer wants to build an "all-in-one" CMS server, i.e. one machine that will run:
RDMBS
App server
web server
File storage
The CMS is expected to be used for a lot of large files, but will not have a large amount of concurrent users (10…
Michael Borgwardt
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2 disk raid0, move all data to one disk, so the other can be removed
I have a raid0 md disk made up of 2 equalized disks. I would like to remove & replace one of the disks (with a disk of the same capacity), without losing any data. Since the md filesystem is only 42% full, all the data should fit on one of the…
Amandasaurus
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