Questions tagged [raid-1]

RAID 1 is the official name for mirrored disks or volumes

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What would happen if a RAID 1 contained 2 different file versions?

Let's say a hardware RAID 1 controller with disks A and B was taken offline, and a file present on both disks was altered on disk B (all within an offline state). When the RAID controller is turned ...
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When scrubbing a BTRFS RAID1, is scrubbing one device enough?

Assuming I have a BTRFS-based RAID1 which consists of Label: none uuid: 02bfb534-bc70-4f2d-980d-62004b8993dc Total devices 2 FS bytes used 1.44TiB devid 1 size 1.82TiB used 1....
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Can hardware RAID-1 be enabled on an existing Ubuntu 18.04 system?

I have an ASUS Ubuntu 18.04 system running on an M.2 drive as /dev/nvme1n1. I have added an identical M.2 drive and would like to enable hardware RAID-1 (motherboard supports it). The blank M.2 ...
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Is it possible to add aditional disks to LSI RAID1 array?

Just installed a LSI 9750-8i to my old system with Windows 8.1, added two 2TB disks to SAS-0 port, created RAID1 with them, assigned a letter E: and started cloning data to it. Is it possible to add ...
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ReadyNAS RN312 extremely slow on resync

Running a 2 TB RN312 OS 6.10.3 X-raid and it is taking forever to resync a new disk. See below root@nas-D5-DF-E6:~# cat /proc/mdstat Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] ...
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Reshaping RAID-1 to RAID-5 hangs forever

I have a problem with reshaping RAID level 1 to RAID level 5: it's been hanging at 41% for a few days now. Some background (verbose, since I don't know will end up being relevant; apologies). The ...
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CentOS Understanding Failed Software RAID Array

I have received two notifications from our main server today about failed disks in a raid array. This appears to be a software raid setup years before I started at the company by a past staff member. ...
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New 2x SATA 12TB drives, failed during RAID1 init, S.M.A.R.T. error

I've recently set up a machine with Threadripper 3960X and Zenith II. I bought two 12TB Seagate drives (Barracuda Pro) with intention to set them up in RAID1 using motherboard's onboard RAID. Now, I ...
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35 views

How does loss of single drive influence 4k random performance of RAID 1 array?

Here is one explanation of the benefits of RAID 1: "As different disks can seek on different data, it [RAID 1] has up to 2x the random read IOPS but the same 1x (or slightly lower, due to ...
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Unable to re-assemble RAID1 using mdadm — failed to run array, invalid argument

I'm trying to assemble a RAID1 array using mdadm. I'd like to be able to debug this error, but I'm not sure where the error actually is, other than "Invalid Argument". Here's the main log. I can't ...
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Raid 1 disk failed, cannot make active single spare that was rebuilding

I had a 2 disk raid 1. While one of the disks was syncing, the other failed! The failed disk cannot be used, it is really dead (any attempt to access it blocks for 2 minutes and nothing can be read). ...
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lvconvert asked to wipe an ext4 signature. I refused. But it says it succeeded. What's going on?

I have a volume group hdd_encrypted_vg on two physical devices. I had a logical volume important in this vg on one of the physical devices. I wanted to make important a raid1, so I did lvconvert: # ...
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How to change Raid 1 setup to non raid? Windows won't boot up on Raid 1 config no more. Trying to get windows 10 booting fine again

Hoping a superuser can help me with this issue. I currently purchased a PC from ORIGIN. Everything was working fine until 10 days ago. My computer no longer booted to windows.. It just showed the ...
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Server 2012 RAID 1 drive expansion onto additional RAID 1 disk

I currently have two 500GB HDD set up as RAID 1 on server 2012 via the C100 raid controller. This is disk 0. They are split into C: and D: drives/volumes C: has the OS and program files, D: has ...
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Win 10 boot volume mirror fails: Boot configuration data could not be updated

Trying in Windows 10 to add a mirror of the C:\ volume, but Disk Management gives an error: Disk Management The boot configuration data of the system could not be updated. Use bcdedit.exe to ...
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Linux softraid: Can disk image files mounted via loop device be located on a raid 1?

I want to use a softraid mirror for my new Linux installation (VoidLinux) -- complete mirror of swap and /. Now I also want to mount some directories (e.g. /home) via loop device from a disk image ...
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531 views

mdadm RAID underlaying an LVM gone after reboot

The main part of my problem ha been discussed here the other time... ... but I have two special questions that haven't been answered before. The Situation: I upgraded my hardware, installing two new ...
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649 views

VMWare ESXi + Intel VROC

I have a supermicro server with 2 SSD that are connected through VDM VROC. I configured these 2 disks in the BIOS to be RAID 1 on the VROC config. The problem is when I install VMWare ESXi that it ...
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RAID1 in Linux makes HDD light always on?

I made a RAID1 using two SATA HDD in Ubuntu 19.04 following this guide. It seems to work properly, but once mounted the HDD lights are always on. Is it normal? I only using one half of each disk. ...
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220 views

df is not listing one RAID device (RAID1) on Ubuntu 18.04. fdisk -l lists both

I had installed two RAID1 drives on Ubuntu 18.04 and had verified that if any one drive is taken out, the system booted and then after the second drive was added, it resynced. That was some months ...
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Is it possible to repair a BTRFS raid 0 file system from a backup?

Here's the situation I'm in. I set up BTRFS with data in raid0 and metadata in raid1. 1 of the drives failed and I've already ordered a replacement. I made daily backups of the data to a separate ...
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1answer
18 views

Is it possible to run a raid-1 on a 2 hard drive usb device?

I have an Icy Box (https://www.amazon.de/IB-3620U3-Externes-Festplatten-Anschluss-Smart-Lüfter/dp/B00I4E2FYI), which I would like to run a raid 1 system on. But I am curious whether that will ...
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Why Raid 1 don't improve read performance like Raid 0?

It should be able to read the data across the 2 disks like with Raid 0 right? but when I look at benchmark it looks like only one drive is used to read the data. https://raid.wiki.kernel.org/index....
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243 views

mdadm UUID lost after reboot

Here is the problem. I part all disks into 4 partitions. Use all disk partition one to create raid1(md0). However, after reboot some of the raid members lost, the raid is degraded. Use blkid to check ...
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Getting a drive from RAID1 to non-RAID on a new build

It's a bit of a long story - I accidentally clicked "hibernate" instead of "restart" on my Solus Linux desktop. Apparently that was a bad idea because nothing I did would resume it. I ended up either ...
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56 views

Can a mdadm software RAID 1 drive be accessed independent of the other drive in the array?

I'm doing research for a project I'm starting, so I cannot provide configuration here. Say I have a software RAID 1 array configured between two drives with mdadm. If I write data to the array and ...
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92 views

Does RAID 1 improve random read latency?

Specifically, in the cases of mdraid and Intel Rapid Storage. If so, is it done by "racing" the disks, or is only the "less busy" disk that's queried?
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Windows 7 software RAID 1 hard disk reactivation taking a very long time, how normal is it and what can I do?

I had an HDD start failing in my RAID 1 array recently (two 2 TB HDDs, no operating systems installed on the RAID). The failing drive had to be replaced, but during debugging of another issue (which ...
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HDDs don’t work properly with Dell 6/IR Raid Controller

I maintain a Dell PowerEdge T410 (running Windows Server 2019 Essentials) with a SAS 6/IR RAID controller configured with a RAID1 of two Seagate Exos E 7E2 1TB (link to exact specs here) HDDs, which ...
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276 views

Best data security cache settings in windows Intel Rapid Storage Technology for Raid 1 and Raid 0

I have raid 0 - 2 x SSD - used as windows disk raid 1 - 2 x 4 TB storage - used as data backup extremely important I am rather interested in best data security and reliability rather than speed ...
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Other ways to control ARC-1200 RAID status

I am having a problem managing the RAID disks we have on our workstation. There's already an ARC-1200 controller from ARECA and we have Win 10 OS. I have installed the ArcSAP controller Utility. ...
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Linux RAID1 disk not booting in new PC - Gave up waiting for root device

I had a Debian linux PC with two hard disks using raid1. Used is as DHCP and firewall. The raid1 consisted of two partitions, md0 as swap, md1 for / . The motherboard in that PC stopped working, and ...
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2k views

Do I need to wait for 100% resync?

I have set up a mirrored partition in Windows 10. Today I noticed a lot of disk activity in task manager for no apparent reason. Looking up the disk management, I see that it is resynchng. In task ...
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260 views

mdadm re-added a removed disk to my RAID1 and skipped re-sycning it, what went wrong?

I ran into what is a true mystery to me today, and would love if someone could give me an idea of how what happened is even possible. We had physically removed a disk from our software RAID1 (Ubuntu ...
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215 views

how can I add SSD as RAID 1 cache?

I have 2x 3TB hard drive setup as software RAID 1. sometimes, it was painfully slow. How can I add an SSD as its cache? is it possible? Note : the RAID was where the debian linux inside booted from....
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238 views

File system corrupt after re-adding software RAID 1 member after test. Why?

A colleague and me set up a software RAID 1 with mdadm consisting of two physical disks, with two partitions on the virtual device. The set up went fine, and booting directly from one of the RAID ...
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RAID1 restoring and upgrading

I have a server running CentOS 5 in a software Raid 1 (2 Drives) One of the drives has degraded and these drives are SATA 250GB @ 3Gbps not 6Gbps, I was wondering what If I slapped in a 500GB @ 6Gbps ...
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133 views

How to create raid1 mirror for existing mdadm raid0 - without overwriting data

I created a /dev/md1 raid0 across two drives, added ext4 filesystem, and it's mountable and working fine. I created a /dev/md2 raid0 across two drives, added ext4 filesystem, and it's also mountable ...
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327 views

raid 1 - single disk

I'm reaching out to you as I messed up my raid 1. It all started with a broken disk. I replaced the disk with a new one. The sync seems to be successfull. However, I'm getting tons of errors and the ...
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368 views

System really limited by disk IO? Rate in atop much lower than expected

I have a system with two 2TByte SATA disks configured as a Raid1 array. There are times when the cpu is waiting for I/O for more than 20% of the time (output from sar) e.g. 09:25:01 CPU %...
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486 views

How to secure erase a Western Digital My Cloud Mirror (Gen 2)?

Before transmitting a Western My Cloud Mirror 6TB NAS storage in RAID 1 (2x 3 TB) from one customer (selling it) to another one (buying it), I need to wipe the data, whilst preserving intact the ...
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164 views

Can't boot from MDADM array after creating other arrays and rebooting

I recently installed Ubuntu 18.04 Server on a pair of drives in RAID1, which I set up using the installer. Previously, I was able to boot into the RAID install without any problem (even though it ...
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198 views

Raid1, three of more drives, solution to multi-terrabyte setups in small businesses?

With the space to cost ratio of hard drives leading to capacities that present an increasing challenge to parity Raid systems (URE probability, multi-day rebuilds stressing drives and risking ...
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Read Raid 1 HD as External HD

I had two drives on a raid 1 but the motherboard literately caught on fire (tis was a brand new comp/board). Comp was rebuild but the drives were not spinning. Change the board on both HDs and they ...
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mdadm RAID 1 not activating spare after replacing faulty drive

Have issue with mdadm similar to Simple mdadm RAID 1 not activating spare: have replaced faulty HDD in RAID 10 fdisked and added new hdd to mdadmn mdam resynced array After that I see following: ......
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Would it be advisable to have 2 raid-1 (mirror) using just 2 physical drives compared to just 1 raid-1 on 2 physical drives?

I'm using 2-bay drive Synology (implies I'm using linux mdadm software based RAID system). The motivation for doing so is to lessen the time rebuild RAID-1 array after it goes degraded. I currently ...
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248 views

How to check/repair a RAID1 array?

I’m currently using a software RAID-1 array on linux, built on top of a HDD and a SSD. I have a strong feeling that the SSD is failing. I’d like to check how bad the SSD is behaving. I ran a check of ...
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70 views

Weird drive conflict in windows 10 with some programs

I've got a RAID1, and an EX-RAID1 that was de-raided and is now a standard disk. In some programs, such as the duplicate finder I use, it seems to think both are the same disk. i.e. :E:\<->L:\, ...
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Raid 1 and upgrading to bigger hard drives

I currently have a pair of 2Tb drives in a case that will take up to 4 hard drives in hot swappable bays and have up to now been manually copying files from Drive 1 to Drive 2......manually doing what ...
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859 views

RAID 1 disk goes 100% activity all the time with 0 read/write with 0ms response

I have setup software RAID 1 in windows 10 v1709. Main disk is SATA3 ssd but I have also two 3TB Seagate disks in software RAID 1 (mirrored). I have this setup for a few mounths and I had no problems ...

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