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

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RAID1 /proc/mdstat output - is the disk a spare or is it active

I recently created a raid1 out of 2 hard drives (8tb wd red). The content of /proc/mdstat is confusing to me. This is it: $ cat /proc/mdstat Personalities : [raid1] [linear] [multipath] [raid0] [...
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4k 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 ...
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20 views

Resizing pre-installed and mounted raid partitions for LVM use

Every time we order a new server from a new provider or even just with a new distro we run into inconsistencies. Meaning even though we go for a minimal distro the server will come with unwanted ...
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61 views

How do I safely add a missing partition to an existing RAID-1 setup?

My server had RAID-1 setup and a few days ago one drive failed. I replaced it and added it back to the array. The problem is that the 3TB drive had 2 partitions: root@s01 [~]# df -h Filesystem ...
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What part of the server has failed if a replaced RAID-1 drive is not being detected?

I had a drive (/dev/sdc) in a RAID-1 fail, it showed as "faulty" in mdadm so it was replaced. But then the new drive was not recognised or detected at all. I ran this command after the new drive (one ...
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1answer
22 views

How do I format and properly re-add a drive to a RAID-1 array?

I had a failed drive from a RAID-1 array (2 drives) replaced and now need to: Format it. Add it back to the array. My drives are like this: root@s01 [~]# df -h Filesystem Size Used ...
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45 views

LVM Raid1 mirror leg lost

Odd one. I have 3 x 3TB disks in my server. /dev/sdc[1] is a raw 3 TB disk /dev/sda2 is /boot /dev/sda3 is 3TB /dev/sdb1 is 3TB sda3 and sdb1 were a raid1 mirror The server was up for some time, ...
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1k views

Where is my new hard disk Citrix Xen Center

I'm trying to create a new storage repository on a server that already has 2 old hard disks, set up with hardware RAID 1. It's my first time doing this in Xen Server environment so I wanna be extra ...
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2answers
43 views

Migrating NAS using LVM to Hardware RAID1 without data loss

I'm trying to figure out how to add RAID 1 to my CentOS NAS server. Today I have 2x3TB disks in a non-RAID configuration. I'm using LVM to manage a few logical volumes to partition my data. I'm not ...
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mdadm: hot remove failed for…

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
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65 views

Configure RAID 1 on ThinkServer TS140

I am setting up a server for a business, and one of the specifications that they have set is a RAID 1 configuration for the two drives in the machine (the OS will be installed on this mirror). One of ...
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lsi sas 3442E-R Low write speed (4 MB/s) IN RAID 1 MOD

R controller (B1 Revision) Latest BIOS and MPT version MotherBoard: ASUS P8H77-M LE, Latest BIOS version sas 3442E-R insert into PCI-E x4 slot. in x16 slot - not detect motherboard DISKS: WD sata ...
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2answers
142 views

Can't get my RAID array out of degraded mode

I've got a 4-drive RAID 10 array that has just had a drive failure. I ignorantly have never practiced how to recover from a failure (I'm a programmer, just keeping this server as a hobbyist) so I'm ...
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30 views

Why does 'fstrim /' destroy my mdadm RAID 1 array?

I've rented two physical servers. The servers are identical, except from the disks. server#1: 2 x SAMSUNG MZ7TE512HMHP-00000 SSD server#2: 2 x SAMSUNG MZ7LN512HMJP-00000 SSD When I run fstrim -v / ...
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1answer
69 views

High CPU load while IDLE

I have a little issue with CPU load on an ubuntu server 16.04. In IDLE is still: load average: 1.05, 1.06, 1.11. Processes, which are the biggest consumers of resources are md126_raid1 and ...
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1answer
28 views

Configure RAID1 to boot from other disk if first one fails

I have Centos 6.7 running on 2 SSD disk in RAID1. The boot loader is installed only on /dev/sdb so in case it fails I won't be able to boot the system from /dev/sda Is there a safe way to ...
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23 views

ESXi free with 2 VMs dedicated for FEM analysis on a HW RAID1 2x SATA 7.2k ML150 Gen9

I need to build a new server/super workstation for FEM calculations to replace current dual-boot solution, where either windows or unix is working at the time. This new unit is planned to have 24C/48T,...
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1answer
31 views

Drop in write performance when mirroring two RAID 0 arrays

On a CentOS 7 server with 4 SSDs, I created two RAID 0 arrays with mdadm. Both were formatted with ext4 and mounted on separate directories. I benchmarked them using fio and got the following results ...
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mdadm: Which disk is being rebuilt?

I noticed my software RAID1 degraded, and wanted to figure out which of the two disks in the array is being rebuilt/re-synced since they both show as being up. I am hoping someone can shed some light ...
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mdadm software RAID isn't assembled at boot during initramfs stage

First, I prefer to mention I've found and read this. I'm running Debian Jessie with a standard 3.16 kernel. I've manually defined a RAID1 array. But it is not assembled automatically at boot time. ...
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Can you recover files from an overwritten RAID 1? [closed]

Edit: The array is actually RAID1, slight communication hiccup with the rest of my team. Following the decommissioning of one of our server, a manager just realised there was, after all, data that ...
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1answer
51 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 ...
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Dell PowerEdge T520, PERC H310 RAID 1, can I hot swap a HDD without shutting down the server?

I have a Dell Poweredge T520 running Win Server 2008 Rc2 with a PERC H310 RAID Controller. Two 15000 rpm 600GB hard drives setup in RAID 1. One drive is rapid flashing orange indicating failure. Can I ...
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272 views

PERC H310 - Multiple RAID 1 Arrays

Currently, I have a RAID 1 (using two 1TB disks) configured on PERC H310 controller on a PowerEdge T420 Server. It currently contains Windows Server 2012, a Hyper-v role, applications and SQL Server ...
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32 views

Mount One drive part of a Raid 1 in another Linux system

my system does not have Raid setup and this is my first time that I need to mount a drive that was previously on a Raid system. I have both drives, and I do need to check the consistency of the ...
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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 ...
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Recovering grub2 after raid1 disk change: stage1 not read correctly

After recovering from a raid1 disk change I cannot install grub2 any more. I think that I recovered from the disk change correctly (the raid array assembles, I can mount and access the data, etc.) but ...
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3answers
215 views

Can Docker Corrupt a Software RAID Setup? [closed]

I read that software RAID should not be implemented on a machine that also has ESXi virtual machines running. Does this mean that I would want to avoid LVM and or LXC/Docker containers as well on this ...
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HP Proliant G6 - Smart Array p410i, RAID 1 Disk upgrade

We currently have 2 500Gb spinning disks in a RAID 1 configuration. Since we are hitting our storage capacity limit, we want to safely replace both disks with 2 larger SSD's. We have a Proliant G6, ...
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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 ...
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1answer
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Should I expect both disks in my RAID1 array to fail at about the same time?

I have an Ubuntu server with two HDD drives in a software RAID1 array. These are identical drives, and I'm assuming they're seeing the same level of read/write activity over their lifetimes (correct ...
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How can I check if my server have RAID-1?

With lsblk command I get: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 232.9G 0 disk ├─sda1 8:1 0 32G 0 part │ └─md0 9:0 0 32G 0 raid1 [SWAP] ├─sda2 8:2 ...
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Add a new disk to raid1 on LSI Logic SAS1064E B1 controller

I've a trouble with my (two disks) RAID1 array running on a LSI Logic SAS1064E B1 controller. The array is degraded and one disk isn't detected by the controller. I've tested both disks with a sata to ...
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2answers
102 views

HP Smart Array P212 - rebuild Array 1 for OS without loosing Array 2 (Data)

Ok.. I'm fairly new to this, but I have a DL180 G6 running with following configuration an HP's P212 Controller: 01 Array: 2x 1TB for OS 02 Array: 12x 2TB for Data Now I would like to Change both ...
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LVM Raid 1 + SSD Caching

I have three disks: /dev/sda slow hdd /dev/sdb slow hdd /dev/sdc fast ssd /dev/vg0 volume group consisting /dev/sd{a,b,c} Each logical volume (lv) should be raid1 mirrored and ssd cached. With ...
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427 views

Rebuilding RAID1 issues

My upgrade to Karmic went well, I even got a message from the utility Palimpsest saying that one of my drives in my RAID1 had many bad sectors. I purchased a same sized drive from Newegg and replaced ...
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136 views

Transfer from RAID-1 to RAID-0 — easy as cloning?

I have a RAID-1 of 1TB drives using on-board RAID. I have 2 new 240GB SSDs I want to place in RAID-0. This is Windows Server 2012. I know with disk cloning/transferring that it is important going ...
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mdadm RAID1 won't rebuild

A drive on one of my Hetzner servers failed yesterday. I've replaced it once before, but this time it just will not work. After I copy the GPT to the new disk, I add one of the partitions to the ...
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Uneven disc throughput in RAID1 configuration

I am having performance issue caused by slow IO in server which has two identical SSDs in RAID1 configuration. By using "atop" noticed that discs usage is no even: DD | md2 | busy 0% ...
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1answer
353 views

Linux- Convert 2 disk raid1 to raid0

I have a linux server (3.19.0) which has raid setup with md (v3.2.5). / is a raid1 device with 2 disks. There was a mistake when installing this machine, instead we need those 2 disks to be in raid0 ...
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Raid 1 and Raid 5 with Debian 8 Install [duplicate]

Ive been advised that i should install Debian 8 using the following raid configuration: Raid 1 (2 discs) - for OS Raid 5 (4 discs) for data. This way, i can have 2 disc failures and still have a ...
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mdadm: Convert RAID10 to RAID1

The machine in question is equipped with 4x ssd, and running Debian wheezy 7.8, linux kernel 3.2.0-4, mdadm v3.2.5. Currently I'm using a RAID10 consisting of all these ssd. I've to increase the ...
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Adding New Drives to Dell R720 in RAID 1 Configuration w/ Dell Lifecycle Controller

I have a Dell R720 with two 136GB drives set up on an existing virtual disc running RAID 1. I've run out of room, purchased two additional 600GB SAS 15K drives I'd like to set up for RAID 1 also to be ...
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1answer
137 views

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 ...
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1answer
727 views

Synology disk mirror SHR or RAID 1

I created a mirrored volume on my Synology DS415+ created with two equal disks. The default mode was Synology Hybrid RAID (SHR) but I see that I could also could have chosen for 'regular' RAID 1. As ...
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1answer
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Are there any two-bay hardware bit/block level replication devices (perhaps RAID-1)? [closed]

Here's what I'm hoping to do: Have two drives in a hardware bay that can be pulled from the front without dissassembly Read and write to it as a single (NTFS) disk Be able to pull either drive and ...
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Reducing the Size of a Partition in RAID1 CentOS

I need to reduce the size of a partition in RAID1. The current configuration of the disks are shown below: (parted) select /dev/sda Using /dev/sda (parted) p Model: ATA ST1000NM0011 (scsi) Disk /dev/...
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How can I coax RHEL / CentOS / SL 7 into booting normally with degraded software RAID 1

I set up a new server (my first with this version of Linux). I installed a pair of 160 GB blank SATA HDDs (one Seagate and one WDC, but with exactly the same number of LBA sectors) in an old machine, ...
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103 views

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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4k views

How to auto-start Degraded Software RAID1 under Debian 8.0.0 on boot?

If you remove a component HDD from an array, it drops into a "busy box" shell under "(initramfs)" saying something similar to "cannot mount root device" as the RAID1 array becomes "inactive". It is ...