Questions tagged [raid1]

RAID 1 or Mirrored RAID uses two or more disks that store the same data.

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Should "System" chunks be included in a btrfs RAID1 balance?

The btrfs wiki RAID1 conversion example gives the following command: btrfs balance start -dconvert=raid1 -mconvert=raid1 /mnt There is also the option -s which `man btrfs-balance page defines as: ...
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Bad sector on disk, part of a LVM over RAID1 array, which files are affected?

My RAID1 array /dev/md1 is rebuilding after one of the disks has been replaced. Problem : the source disk has Unrecoverable Errors, and my only choice if I do not want to lose the whole data set (no ...
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MD RAID 1 with external bitmap doesn't fully resync

I have an interesting configuration: dual boot system with a RAID 1 that needs to be visible in both Windows and Linux. The Windows install is Win 7 Enterprise, and the Linux install is Kubuntu 10.04. ...
user64744's user avatar
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How to set up system-drive RAID1 on Server 2016 with two HDD larger than 2TB?

Foreword: As much as I tried to search the internet, most of the tutorials are for regular smaller than 2TB drives. And there are tons of forum posts that say "use hwraid". And I found a method that ...
Apache's user avatar
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Solaris 9: Degraded mirror unmanageable with raidctl after drive replacement

We have a pair of Sunfire v20z's (WITH LSI MPT raid) that have each had one drive in their mirrors die. bash-2.05# cat /etc/release Solaris 9 4/04 s9x_u6wos_08a x86 ...
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2 votes
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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
2 votes
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How to restore RAID1 configuration with 2 different HardDrives in CentOS-7

We have a server (HP ProLiant ML10 Gen 9) that came with Two Identical Hard disks. It was assumed that the server supports hardware RAID 1 (Mirror), and the CentOS-7 was installed in it. But later we ...
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How does Linux MD software RAID avoid assembling old and new devices into the same array?

On a Linux MD software RAID1 I removed a failed drive and added a new one. (All fine now.) The old drive and the new were never in the system at the same time. Do I see that right, that adding the old ...
Robert Siemer's user avatar
2 votes
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How to replace Raid1 hard drives with large ones using Storcli tool

I have raid1 with 2 physical drives (SATA 3.637 TB). I want to extend it's size with large ones without losing data. ----------------------------------------------------------------------------- DG ...
Максим Шабунин's user avatar
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Boot failing to complete after resizing RAID 1 with GParted

So I have the following setup in Ubuntu 18.04: /dev/md0: / (ext4) /dev/md1: swap /dev/md2: /var/lib (ext4) I needed to free a couple of GB space after /dev/md2, so I decided to live boot using ...
Antonio López's user avatar
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T110 - Raid 1 - Rebuilding remains at 0% after switching from 1 hd

Dell T 100 Server PERC S 100 Controller Raid 1 with 2 Hds Physical Disks   ID 0: 0 Status OK Name Physical Disk 0: 0 State Online Bus Protocol SATA Media HDD Revision 02.03B05 Failure Predicted No ...
Aloisio Fraga's user avatar
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How to remove a dmraid RAID1 member (mark as faulty)?

I have RHEL 6.8 installed on a fake Intel RAID1 (Intel Matrix). It's managed by dmraid, consists of sda and sdb and the device name is /dev/mapper/...
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Creating RAID 1 using mdadm for Root disk in Linux:

I recently found one of our production server (running RHEL7) doesn’t have the root disk mirrored. So, we thought of using one of the spare disks (which has some junk data) for mirroring the root disk ...
Ram Kumar's user avatar
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1 answer
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Upgrade SATA drive on Dell Poweredge 1950, RAID 1, Ubuntu server

My current set up is a Dell PowerEdge 1950, two 250GB SATA drives, RAID 1, OS is Ubuntu server. Using it for running OTRS (open source help desk). I'd like to upgrade the drives to the maximum ...
Dror Ambar's user avatar
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Raid1 disk degraded after reboot

I'm testing a Rackspace cloud server and have two Cloud Block Storage volumes set up in a Raid1 configuration. There are no system files on these volumes, they're purely for storage. Everything ...
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HP DL360 G6 ssd on raid 1 with smart array p410i write verry slow, how to fix it?

I just bought a HP DL360G6 server with a P410i RAID card with 256mb cache. I am using Windows server 2012 I use Intel 520 series 240GB SSDs in raid 1+0, but the speed is very slow. I checked the speed ...
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LVM Expand RAID1 with Asymmetric Segments Across 3 Heterogeneous Disks

I have 3 disks: one 1TB drive (A1), one 2TB drive (A2), and one 3TB drive (B). Currently, A2 has data on it in one LV that is 1.6TB in size. A1, A2, and B are PVs, in a volume group MyVG. I desire a ...
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Trying to set up RAID 1 array on existing AlmaLinux OS disk running LVM, get 'partition exists' warning

I am following instructions from here for setting up a RAID1 on an existing Linux installation. The instructions are for a Debian/Ubuntu installation, but I can't find any specifically for AlmaLinux, ...
jamminjames's user avatar
1 vote
1 answer
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Erratic SMART readings on one member of a RAID 1 array

I am managing a server that uses 2 nvme ssds on RAID 1 connectivity. At once point I lost access to one of the 2 and got my normal raid array degraded mails from mdadm. So I asked from the hosting ...
escozul's user avatar
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Synology SHR Volume - Migrate from 3 disks (RAID5-ish) volume into 2 new disks (RAID1-ish)

What I have: 3 x 6TB SHR Volume with 12 TB redundant storage (1 disk recently broken) What I want: 2 x 18TB SHR volume with 18 TB redundant storage (I'll expand the volume after the migration) Of ...
Esben von Buchwald's user avatar
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PCI NVMe mdadm RAID1 performance too slow

I know this has been discussed multiple times but I have not found any solution so far that worked so posting here hoping there is some solutions in Dec 2021… I have a Dell R640 server with dual Xeon ...
JackFrost's user avatar
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Adaptec 8405E RAID 1 extremely slow expansion (1% per day)

Our RAID 1 is being expanded from 4 TB to 8 TB. The GUI status looks like this: The progress happens by about 1% per day. At the same time, the server is quite slow. This seems like an extremely slow ...
boot4life's user avatar
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Windows-Server-2019 - Raid 1 Software - Could not convert Disk to Dynamic security enabled on Disk

I installed a fresh Windows Server 2019 on ONE of two identical Crucial CT1000MX500SSD1M. I don't have an integrated RAID controller on my MB ASUS_H110m-A/M.2 so I wanted to try a software RAID 1, ...
Francesco Russo's user avatar
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194 views

RAID1 clean, degrade

after a fire in my hosting, i finally recovered access to my Debian 9 server. I can enter in recovery mode but i can't run the server in normal (HDD) mode. If i run /cat/mdstat i have 4 RAID 1 entries:...
ctcp's user avatar
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Reusing a disk which was in the RAID array

My DC has added a new hard disk. It appears as md124 inactive sdc1. When I try to mount, the error is unknown filesystem type 'linux_raid_member', I need to use this disk for backup VM. Can I just do ...
Christoper lim's user avatar
1 vote
1 answer
394 views

How to expand logical volume in HP ML150 gen 9 , smart hba h240

I have replaced two hotplug 300gb sas drives with 600gb sas drives (raid 1) . The smart storage administrator have no option of increasing the logical volume to the new drives. So now i'm stuck with ...
David's user avatar
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Very slow read/write on software raid1 with nvme device on Ubuntu focal

I have a server with Ubuntu 20.04.1 LTS with NVME ssd devices running on raid1 and the hard drive operates so slow! to open a gzip file to of 500MB to a 3.7GB takes a while.. way more then it should. ...
ufk's user avatar
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2 answers
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MDADM RAID-1 "not large enough to join array" on identical partition tables

I have two disks with identical partition tables (sudo sfdisk -d /dev/sda | sudo sfdisk /dev/sdb) that mdadm refuses to merge as a RAID-1 array. $ sudo mdadm --manage /dev/md0 --add /dev/sdb1 mdadm: /...
Suuuehgi's user avatar
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Ubuntu 18.04 "Advanced Installation" official guide for RAID 1 installation appears broken for UEFI installation

I had no issues earlier with RAID 1 setup on Ubuntu 16.04. However, on 18.04 it has been a struggle. I finally located this guide. I followed the guideline to the dot. However, I am unable to set the ...
Sunny's user avatar
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What is more stressful for an SSD drive, a RAID-1 sync or multiple OS and software installations?

I was wondering recently, what is more stressful for an SSD drive in a RAID-1 array, a RAID sync or multiple installations of OSes and software. Say for example that you have a new server with empty ...
user2173353's user avatar
1 vote
1 answer
564 views

Recover data from RAID1 single disk only

root@rescue:~# fdisk -l Device Boot Start End Sectors Size Id Type /dev/sda1 69632 102713344 102643713 49G 83 Linux /dev/sda2 102782976 467808255 365025280 174.1G ...
Prakash's user avatar
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Persistent multiple medium errors on LSI RAID array

One of our SuperMicro servers with an onboard LSI 2308 RAID controller has been having issues with our main RAID10 array consisting of 4 Seagate 600 PRO SSD drives (in slots 0,1,2,3). It started with ...
vdyvp's user avatar
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How to recover from a RAID 1 Disk Failure on HP Proliant Gen8 v2

I just had a disk failure on one of my physical drives of a RAID 1 logical drives, on a HP Proliant Gen8 v2 Server running Windows 2012 R2. The problem is that the original drive is 500GB and I only ...
Jonas's user avatar
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1 answer
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3-drive RAID-1 on pfSense box

I have a pfSense box with a 2-drive RAID-1 using gmirror. Recently, a drive failed, and I replaced the drive, and the RAID-1 is now back to normal. But this incident also made me interested in ...
Siler's user avatar
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Is it safe to test and erase a drive after removing it from a RAID1 array with mdadm?

I have a faulty drive in my RAID1 array (SMART errors, data corruption). I have marked it as failed and removed it from the array with mdadm: # mdadm --manage /dev/md0 --fail /dev/sdb1 # mdadm --...
kontextify's user avatar
1 vote
0 answers
343 views

Cloning SAS RAID1 array with OS partition to a new SATA array?

I have two RAID1 arrays, first one is made of SAS disks and that's where the OS (Win Server 2k8 r2) is, the second RAID1 array contains SATA SSDs (and hold the database). Server is IBM's System x3650 ...
Dom Delimar's user avatar
1 vote
0 answers
450 views

Adaptec Raid1 on Debian failed Stripes

its my 1st question here so please be kind. I've got an monitoring server which is running on debian wheezy. It runs a RAID1 (2x 160GB) on a Adaptec Raid Controller (IBM ServeRAID 8k-l). A few days ...
n. traber's user avatar
1 vote
1 answer
577 views

Replace failed RAID 1 Drive on Intel Platform

Good afternoon, I have a Intel Server running Windows 2008 R2 Standard. It has a RMS25PB080 Raid controller card in with. It has two logical drives, a RAID 1 and a RAID 5. The one harddrive on the ...
Adrian's user avatar
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Does mdstat showing very different block sizes for identical drives indicate a failing drive?

One of my servers has a RAID1 array composed of two 240GB SSDs. It is managed/controlled via Linux, not via a hardware card. Recently, for no apparent reason, the array needed rebuilding. I rebooted ...
Jeff Widman's user avatar
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1 answer
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Recover Data from RAID 1 : Array failed

I have a HP Proliant ML150 server with a scsi raid controller installed. Two disks are configured in RAID 1. My problem is when i start my computer, in the beginning, a message appears that the array ...
user2156353's user avatar
1 vote
0 answers
822 views

CentOS Raid 1 drive fails on raid-check

I have a pair of HP DL320e servers configured identically with two WD Red 6TB drives in a software raid 1 array. The DL320e has an on board raid controller which is disabled in favour of linux ...
Bruce Skingle's user avatar
1 vote
1 answer
921 views

Disk errors Event ID 51 on LSI MegaRAID 9240-8i in RAID 1

I am working on a case of recurrent disk errors. Server is running Windows Server 2012 R2 Standard. There are two main disks on a mirrored RAID. There is also an additional drive that is used for ...
RAdministrator's user avatar
1 vote
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31 views

RAID disk size is slightly more than 500

In my shop we have a number of Windows 7 machines from HP which have hardware RAID 1. Some of them have Hitachi HDS721050CLA662 disks rated at 500.1 GB. If I have to replace one of these disks due ...
J. L. Tympanum's user avatar
1 vote
1 answer
748 views

Ubuntu Software RAID 1 with NTFS weird volumes on RAID Array

I'm trying to mirror two secondary 2TB HDDs with RAID 1 with 1 big NTFS partition and am coming cross something that looks weird to me, although it could just be my complete ignorance because this is ...
James's user avatar
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0 answers
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Server RAID0: one hdd is more %busy then the others?

I'm testing 3 servers with RAID0 with 4 disks. During my test I noticed on all 3 servers that one of the hdd's is more %busy and has much higher averige IO wait (almost 4x higher then the other hdd's)....
klaasio's user avatar
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Why would a raid 1 "break" on it's own?

So I went out to look at a video server the other day that had degraded raid issues. I've read about the various raid levels and how they are supposed to work, but the behavior I witnessed here has me ...
Sidney's user avatar
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1 vote
1 answer
172 views

How to copy RAID 1 HDDs from one server to another Identical server

I have one IBM X3100M4, type 2582 windows server and having 2 x 500 GB HDDs in RAID Copy. Now brought new server and having blank HDDs. How can I copy RAID HDDs from Old server to new server? I have ...
user223701's user avatar
1 vote
1 answer
868 views

Split a Dell PERC 6/i RAID-1 mirror to temporarily to add additional storage

I need to tidy some disk partitions in Windows Server 2012, but don't have enough storage space, and all drive bays are in use. I'd like to split the mirror, use one of the disks as temporary storage ...
Andy Joiner's user avatar
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1 vote
3 answers
10k views

SBS 2003 boot stalls at acpitabl.dat

I have a SBS 2003 server running for 3 year without any problems, and few days ago it freezes during the boot. System is using two 500 Gb drives in RAID1 (Intel Matrix 7.5) After trying to load in ...
John's user avatar
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1 answer
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Storage setup on Ubuntu Server used for running virtual machines with software redundancy

I have a server I would like to use explicitly for running virtual machines under Ubuntu Server 12.04. It has plenty of RAM, 64GB and three large identical HDD´s. I would like redundancy through ...
Deleted's user avatar
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