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Questions tagged [raid]

RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

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estata multiple targets [on hold]

I'm setting up a server with an external eSATA disk array to serve files for a small network. Using Slackware or Ubuntu (I'm not that deep in yet) with kernel 4.4 or 4.15. The system sees the disk ...
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ZFS on mdadm: Implications?

I am considering setting up a RAID array with mdadm/Linux RAID, and using the ZFS filesystem on the resulting device (ie. /dev/md0). Many would suggest using ZFS to create the RAID array directly, ...
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linux “mdadm --write-journal” and lvmcache - how do they relate?

In linux mdadm man page I saw the option "--write-journal". How does this relate to lvmcache as lvmcache is built on top of dm-cache? Are they different things or does lvmcache do something like "--...
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lvmcache and ext4 data=journal => overkill?

We are running lvmcache (24TB raid5 hdd data, 64GB raid1 ssd cache+meta) and we are using external journal with data=journal for the ext4 fs on that raid5 and have the journal on the same ssd raid1 (...
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MDADM RAID SET HDD MEMBER

Did anyone know if there is a .conf file or text file that list all the HDD uuid or identification id within a MDADM RAID. let me know if you have idea and where i can find it (I am using CentOS 6.5 ...
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9 views

Error message on raid boot - “Either the required RAID not set or more options required”

I'm configuring a RAID system for a Centos 6.9 install, and it seems to be working ok. But I noticed this error on the boot log: Activate Software (ATA)Raid: ERROR: Either the required RAID not set ...
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Is it possible to create raid-0 without losing data?

My linux root OS device is /dev/sda, and my external hard drive is /dev/sdb (empty drive) I don't want to loss data on /dev/sda, and setup raid level 0. Is this possible?
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Mirror Linux disk writes to secondary disk [duplicate]

I would like to set up a Linux system to use one primary storage device, but copy all writes to that device to another secondary device without blocking for every write - e.g. an NVMe SSD as primary ...
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New RAID controller from LSI/AVAGO MegaRAID SAS 9361-16i on my Linux

I have a new RAID controller from LSI/AVAGO MegaRAID SAS 9361-16i on my Linux server installed as hardware. I booted with LiveCD and installed the latest Firmware for this controller. After that I ...
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mdadm raid10 recovery - is this filesystem corrupted? Is it fixable?

Background: I had an Ubuntu Bionic system set up and running using 3x1tb disks. The disks were all partitioned with one circa 15gb partition and the remaining circa 983gb. 15gb partitions from two ...
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How to see write speed with iostat?

I am trying to monitor disk i/o in CentOS 7. Using iostat I can see accurate numbers for sdb, which is my boot drive. But for sda I can only see read speed. Write speed always shows zero. sdb is a ...
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Adaptec RAID logical device reporting bad stripes, What to do?

I have a massive storage machine with an Adaptec RAID Controller card. One array reported failed stripes so I do a litle bit of search and found the following link After reading the link, this is ...
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How to boot after removing one disk from encrypted software RAID? [closed]

I have installed encrypted software RAID 1 on ubuntu server: After installing I got ubuntu successfully booted up. Then I tried to remove one drive, after that boot failed: Why I cant boot if its ...
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59 views

mdadm, invalid RAID level?

I'm trying to create RAID 5 according to this tutorial. But, when I run mdadm -C /dev/md0 -l=5 -n=4 /dev/sd[b-e]1, I get this error: mdadm: invalid raid level: =5 Here's the output of mdadm -E /dev/...
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MDRAID refusing to reassemble RAID1 disk — claims no superblock on either disk

I've got a pair of 5TB disks, both known good, set up as a mirrored set. Every time the server reboots, MD fails to reassemble the RAID. Using mdadm --assemble says there's no superblock on the ...
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Can I enlarge a RAID partition?

I have an OpenSUSE 42.3 system with a RAID5 (mdadm) made out of four discs (2 2TB and 2 3TB). I'm growing the RAID by replacing the 2TB discs with larger ones. The 3TB discs have only 2TB partitions ...
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How To Remount Raid 1 Array After OS Disk Failed [duplicate]

Have a workstation that has an SSD for the boot drive (Linux Mint) and (software) Raid 1 array for data storage. The SSD died, and I've replaced it and reinstalled Mint. How do I get the OS to ...
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raid 0 restore boot

Looks like my system will not boot next time: [root@master /]# fdisk -l WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion. Disk /dev/sda:...
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mdadm: Exising RAID Level = 5, New Level 0?

I have recently rescued an array of disks from an inherited SAN (unfortunately with no backups available.) The array was setup as x4 500GB discs and running as a RAID5 setup. They have now been ...
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RAIDs disappearing on reboot (Centos 7.5)

I'm trying to create 4 RAID 0 disk arrays on my system running Centos 7.5 and have the RAIDs automount after a reboot. For some reason, only one of the RAIDs /dev/md0 is persistent between boots. The ...
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USB boot install Linux not recognizing disk space

There seem to be similar questions here, here and here but with no confirmed answer, and no answer that addresses my situation satisfactorily. Update: I've deleted Windows and reset BIOS factory ...
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Convert btrfs RAID10 to RAID0

So, I started getting filesystem errors on my 4-drive btrfs RAID10 array, and btrfsck is unsuccessful in repairing them (goes into an infinite loop producing the same output for days on end). The ...
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Hard disk info behind hardware RAID controller?

If I run smartctl -i /dev/sdb I get correct disk information including serial number and drive model number. But this is for a disk marked as JBOD. For n drives that are RAID'ed (using an LSI RAID ...
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207 views

Unable to assemble existing RAID array with mdadm

I originally set up a RAID1 array on Windows with RST (not as a bootable disk). I recently started moving everything to xubuntu, so I tried mdadm on my xubuntu partition (dual boot). Installing and ...
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111 views

mdadm raid 1 how to remove raid and remove data offset to mount normally?

I have a disk that was in a mdadm raid1 with a btrfs partition. Now I want to use this partition without the raid stuff and mount it normally. I already zeroed the mdadm superblock, but now the ...
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119 views

Moving drives currently in software raid to LVM? [duplicate]

I have 3 drives currently set up in RAID 5 via mdadm. I just realized that I goofed and forgot to format them with LVM- is it possible to do this after RAID array creation without losing data?
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Extract a string that is located above and nearest to the matching pattern in a multiline output

Below is the HP ssacli command to see configured hardware RAID details: ssacli ctrl slot=0 show config and its output is as below: HPE Smart Array P408i-a SR Gen10 in Slot 0 (Embedded) Internal ...
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189 views

Software RAID can't assemble because drive is busy

I had an error on a software RAID. After changing a disk, I can't assemble the array because mdadm says: mdadm: /dev/sdb3 is busy - skipping. # --force doesn't change a thing # mdadm --assemble /dev/...
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107 views

Different SSD and HDD sizes on Linux

I am new to linux and I have read this - partitioning using 2 hard disks (SSD and non-SSD) in linux and other related questions. I configured a local file/web server using Fedora with default LVM ...
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333 views

CentOS 7, RAID-1, and degraded performance with SSDs

I am preparing PCs built with 64GB RAM on the Gigabyte AORUS X299-GAMING-3 motherboard, ordered for Cent OS 7 use, with RAID-1 on a pair of Intel 545 Series SSDSC2KW512G8X1 SSDs. The configuration is ...
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(Complicated) RAID hard drive issue

I have a (complicated) RAID hard drive issue, I was wondering if anyone could help me: I have a Synology DS413j with 4 hds, hd 3 failed so I decided to replace them. The official support article says ...
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Make disks “Online” for raid array build with MegaCli

I installed two new disks on my server. Im trying to create a virtual drive of type raid1. Actually when i list my drives those two appear as "Unconfigured(good), Spun up". I wanna make them "Online" ...
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142 views

High IO load by [md0_raid1]

I'm experiencing a 99% IO load caused by [md0_raid1] process every 20-30 seconds. That 99% IO is very short-term, about 1-2 seconds, but it causes lag for other processes due to io wait (it's very ...
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How to determine if a controller is true hardraid or fakeraid?

I've just bought a new SAS/SATA controller (Highpoint RocketRAID RR2720SGL) and it looks like it is hardware raid, but I've no idea how to tell if it is true hardware raid or yet another fakeraid ...
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Can I check hardware status on a CentOS HP8 server from CLI?

I was wondering if there is a way to check our G8 server’s hardware raid status from the CLI. In person there is a nifty light that shows any errors. Ideally I would be able to set a monitor to ...
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108 views

Mounting an RAID under Debian

I see the disk with lsblk, but in the output of df -h. How do I mount the disks? If I remember correctly it is an ext4 stripe. I tried mount /dev/sda /folder, it says unknown filesystem type '...
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How to replace a disk mounted to a specific folder without losing the stored data

Disk 1 is mounted to /storage, it is 99% full and I am out of spare connectors. What I want to do is replace Disk 1 with a bigger drive (Disk 2) in a way that the new larger disk will contain the same ...
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How can I identify who is writing to NFS server and where are these writes coming from?

Our CentOS6 NFS export is near 100% capacity. We've turned off NFS for now and are trying to move data around. I temporarily turned it back on with logging on and was surprised to see data roaring ...
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Backup mdadm configuration does not work

I backup my raid50 with mdadm --detail --scan --verbose >> /etc/mdadm.conf. Output of mdadm --detail --scan --verbose is: ARRAY /dev/md1 level=raid5 num-devices=3 metadata=1.2 name=1 UUID=...
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204 views

Understanding LVM2 behavior in case of disk failure?

I have a LVM2 group using the following command for a 5x4TB set up: pvcreate /dev/sd{b,c,d,e,f} vgcreate vg0 /dev/sd{b,c,d,e,f} lvcreate -l 100%FREE -n lvol1 vg0 Now that I created this monster, I ...
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308 views

Create Software RAID 1 - unexpected failure opening /dev/md0

I want to create a Software RAID 1 on my Debian. Unfortunately when I execute sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 it returns me mdadm: unexpected ...
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69 views

CentOS trying to mount non existant RAID array -> recovery mode

My first try using RAID1 ended with CentOS not starting anymore - throwing me into Recovery mode. Luckily a test system At first i set-up the raid1 which worked rather good. Later i noticed that my ...
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Help with mdadm will not reassemble

mdadm --misc --examine /dev/sdb5 /dev/sdb5: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 056db792:27540abc:cc95d3b1:862cd0d6 Name : DM061:1 ...
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Can I use one physical disk in two mdadm arrays?

I have three disks that I'd like to use in a RAID setup; 2x4 TB 1x8 TB Can I create two partitions on the 8 TB disk and include in two RAID 1 arrays with the 4 TB disks? RAID 1 array 1: 4 TB ...
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190 views

Problem mounting and reading hard disk

I am trying to read the content of a 1Tb external disk. The device was part of an external nas (dlink 320) using raid 1. when I plug the hard disk using the usb port no partition is mounted. The ...
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65 views

How to partition a software RAID

I want to create a second partition on a software RAID 5 created on debian stretch. To create it I used mdadm --create /dev/md0 --auto md --level=5 --raid-devices=4 /dev/sda1 /dev/sdc1 /dev/sdd1 /dev/...
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78 views

How do I work out what's trashing my RAID?

I have an x86_64 Ubuntu 17.10 install (stock 4.13 kernel) with an SSD and three 1TB WD HDDs which each have a 750GB partition that's used in a 1.45TB RAID5 array. The SSD has my / on it, and the RAID ...
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Home NAS: Best setup to ease data recovery in case of hardware failure? Should I get rid of HW raid 1?

I'm not quite sure how to formulate the question here. I built myself a low energy NAS with an Intel N4200 with 8GB RAM. For the hard drives I'm using two WD red in a Raidon GR3660-B3 which is running ...
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What is best parition format and raid setup for millions of small files? [closed]

If I have millions of small files distributed by folders, what would be the best parition format and what raid setup in order to manage them as fast as possible ? E.g search in all files, find files ...
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210 views

Deconfigure RAID1 and mount the second hard drive in Debian

The dedicated server running on Debian has two 512 SSDs, both part of a single RAID1 disk array. There are many guides for that without losing any data on the disk but could not find the complete one ...