RAID1 or mirrored RAID uses two disk that have the same data.

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mdadm set the mode before a second device raid1?

i have a problem. server use two disk softraid1. disk sda is die, and replaced disk. and reboot now, copy partition table sdb to sda ok. next step copy boot record sdb to sda ok. finaliy add sda in ...
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Hardware RAID1 configuration - Possibly failed sectors on one physical disk. Does the OS automatically read from the other disk?

I'm not a professional sysadmin but since I couldn't find answers to my specific case after researching for a while I was hoping I could get some help here. Our server uses P222 - a HP Smart ...
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29 views

HP Array Utility, Remove a spare drive from a Raid 1 Array

I have a DL380 with 2 Raid 1 arrays with spares. As the server is a part of a cluster I want to remove the spares and create a new logical drive with them. The problem is that HP Array Configuration ...
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2answers
41 views

mdadm - RAIDs of partitions or partitions of RAID?

If using entire drives for an mdadm RAID which will be the boot device as well, is it more correct / standard to: 1) Configure the RAID out of partitions that encompass the whole drive (like ...
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34 views

RAID1 write penalty using mdadm - what's the cause?

When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
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29 views

How to add more RAID 1 storage on Server after the fact?

I have set up a Lenovo TS440 Server (LSI 9240-8i, MegaRaid)) with Windows Server 2012 R2 Essentials and (2) RAID 1 mirror arrays. After noticing that the DATA array (2TB) is actually quite small ...
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43 views

Best RAID level for NAS [closed]

I just bought my first computer that I'm going to run as a NAS with OpenMediaVault as OS. I bought two HDD (WD red 5400 rpm) with the capacity of 3TB each (and one 120GB SSD that I'm going to run the ...
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62 views

RAID 6 - any write amplification in 4-drive RAID?

We're planning to move from a 4-drive RAID6 to a SSD RAID 1, and I was analyzing smartctl data to see how many GB we've writen to the drives over the past year so I can estimate the lifetime of the ...
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30 views

Is a partition necessary when using RAID?

I have configured raid1 on two of my disks. I am not using a partition, because I want to use the entire disk. Is this correct? The command lsblk produces the following output for my disks: sdc ...
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50 views

Adding additional hot swap drive to HP ProLiant DL360 in RAID1 config

I have a HP ProLiant DL360p Gen8 server. It has 8 drive bays with only 6 being used in a RAID1 config. Can I add an additional 2 drives to the empty bays hot and the HP Smart Array Controller will ...
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88 views

How does Rebuild in host-raid RAID-1 works?

I am testing a Non-Hardware Raid with 3 1TB Disks. I create a RAID-1 Array with my first 2 Disks and installed Windows 7 on the Raid disk that i'd created. I unplugged the first disk SATA cable in ...
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81 views

RAID1: approx performance difference of 3 active vs. 2 + spare?

My question concerns only Linux software RAID ("md"). I'm going to set up a RAID1 array with three devices. I need to choose between using the third disk as a spare or as an active member of the ...
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1answer
113 views

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
15 views

Splitting RAID drives from ReadyNas Duo

I have an old ReadyNas Duo that is on its last legs and starting to play up. It currently has 2x 1TB drives inside, configured in a mirrored RAID 1. I've just purchased an external caddy, and ...
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42 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 ...
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18 views

Proactively hot-swap a suspect drive

For one drive in a hardware RAID 1 mirror set (Areca ARC-1200 under Linux), smartmontools is beginning to report read errors with the short selftest every other week. The long selftest still completes ...
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12 views

Disk goes read-only after disabling RAID 1

I am not so expert in Linux. We have a computer (working as server) with Ubuntu 10.10. It has 2 RAID 1+0 hard disks. Today one of the hard disks failed, so we removed it, and disabled it by mdadm ...
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155 views

Ubuntu RAID1: How to boot after (physically) removing /dev/sda? (mdadm, Grub2)

Several months ago I installed Ubuntu 14.04.2 Server (x64) with RAID 1 using the following instructions: https://help.ubuntu.com/lts/serverguide/advanced-installation.html I followed the ...
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1answer
41 views

Software RAID 1 does not extend on two new additional drives

I added two new devices two my software RAID 1 system. They are recognized by mdadm but I can't use the addition space. Here is how I proceed: I added the two new disk to my PC and created on each ...
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1answer
672 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 ...
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448 views

mdadm Software RAID1 with GPT on Debian 8.0 amd64 - Does not boot on disk removal [closed]

INTRO: I have spent countless days attaching/detaching MOLEX->SATA power cables, rebooting machines and trying hundreds of edits and commands. I am on the verge of desperation and desperately in need ...
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1answer
116 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 ...
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2answers
272 views

Can mdadm convert a RAID5 to a RAID1?

I have a RAID5 consisting of 3 disks, one of which is broken. I was wondering if it is possible to convert those two disks to a RAID1 without data loss and without having to back-up the data ...
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64 views

Software Raid: Array inconsistent state

I'm running software raid 1 with md on debian distro. One of the disks has failed, but not all of the raid arrays were at that time in a "fail" state. In order to bring them also in a fail state (in ...
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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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4answers
356 views

mdadm 3-way RAID 1 - good solution for guaranteed 2-drive failure tolerance?

Is a 3-way RAID1 using mdadm a good solution to be able to sustain any two drives failing without the RAID failing? I know this costs extra in the sense of only being able to use 1/3 of the disk ...
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Should I 'run in' one disk of a new RAID 1 pair to decrease the chance of a similar failure time?

I'm setting up a RAID1 array of two new 4TB hard drives. I heard somewhere previously, that making a RAID1 array of new identical hard drives bought at the same time, increased the chance that they ...
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1answer
236 views

Ubuntu 14.04 Installation with Preseeded RAID 1 Partitioning

I have been having a painful time trying to automate an Ubuntu 14.04 Server Installation with RAID 1 partitioning. I'm testing this on top of VirtualBox with two Virtual Disk Images (dynamically ...
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6answers
3k views

Why is RAID 1+6 not a more common layout?

Why are the nested RAID levels 1+5 or 1+6 almost unheard of? The nested RAID levels Wikipedia article is currently missing their sections. I don't understand why they are not more common than RAID ...
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100 views

Is it better to store the MySQL database directory on a separate RAID 1 device?

We have a Linux server with a RAID 1 using two HDDs on which runs a Apache server managing multiple sites and some other services that interact intensively with the databases and produce massive ...
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Unable to boot into software RAID1 after disk failure

Today after restarting my data server I was unable to boot because one of the drives wasn't being recognized any more, it is still spinning when I connect it and not making many weird noises except ...
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99 views

Disk I/O at limit with software raid

whenever I use rm or cp on a bigger file structure the disk i/o is going up to the top, but not with the focus on cp or rm, it is the software raid sync. My knowledge in this area is limited. The ...
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1answer
284 views

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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428 views

Windows Server 2012 doesn't find RAID array during setup

I'm trying to install Windows Server 2012 to a HP ProLiant 140 DL G3. I've attached two Toshiba SSD drives with 256GB capacity each. I've enabled RAID in the BIOS and, using the built-in Disk Manager ...
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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 ...
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Not sure how to change primary partition size and add a new partition on a software RAID1 using mdadm, as well as parted or fdisk?

I'm trying to create a /data partition to run drbd. However the drbd guide only shows steps for an fdisk on a normal disk, and not mdadm software raid. So I have sda3/sdb3, which are holding ...
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1answer
500 views

Monitoring HP Smartarray (cciss) with nagios

I'm trying to monitor an HP Smart Array controller using nagios. I have 4 disks on 2 RAID1 arrays, so 2 disks per RAID1. I installed nrpe-server and nrpe-plugins and I'm using the almighty check_raid ...
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1answer
186 views

cannot remove faulty device from LVM2 raid1 mirror

One of the three disks went off in my LVM raid1 logical volume. (It was a bad experiment actually). The volume is a pure LVM raid1 one (no, not an LVM mirror), without any mdadm / fakeraid. The ...
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1answer
154 views

LSI MegaRAID 9240-4i & RAID1 (mirroring) on ZFS filesystem

Exist any incompatibility between an existing virtual drive created on LSI MegaRAID 9240-4i SAS/SATA Controller with RAID1 and the ZFS filesystem? I tried to make mirror(2xSATA HDD 300Gb) on freebsd ...
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2answers
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3disk in raid 1 using half/half

Im using a mdadm software raid system on my new server which runs 3x120GB ssd drives. Currently, this is the preinstalled configuration that came with the server cat /proc/mdstat Personalities : ...
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389 views

R610 SAS6 Raid 1 Not Recognizing Replacement Drive

I have a Dell R610 with a SAS 6 controller. There's 2 drives (slot 0 and 1) setup in a raid 1. The drive in slot 0 failed and was replaced. However when I installed it (slot 0), the SAS6 controller is ...
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1answer
149 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 ...
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1answer
571 views

Replacing a failed drive - RAID 1

I have a Dell PowerEdge r310, MS Server 2008, RAID 1 setup. I had a two drives fail in the RAID 1 - leaving only one drive in a healthy state. Picture of disk management: I changed the primary ...
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228 views

Dell H700 SSDs and HDs in different RAID groups?

I am about to purchase a Dell R610 and use a H700 RAID controller. I was wanting to add 2 X SSD (480G) RAID 1, and 2 X HD (2TB) RAID 1. In reading over the manuals I saw: SSDs require the PERC 6/i or ...
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I mixed the arguments of sgdisk -R /dev/sdY /dev/sdX

I have two raid1 arrays and an LVM partition across both raid arrays. A disk died and I tried to copy back the partition table of the other member to it using sgdisk -R But I mixed the arguments, ...
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2answers
559 views

HP G8 migrate RAID0 to RAID1 with CLI commands

This is a Dynamic Smart Array B120i. The SSA (Smart Storage Administrator) is ver 1.50.4.0 The OS was installed into a single hard disc (bay 1), the SSA reports like RAID 0. Then I add a new hard disc ...
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69 views

The partitioning of a big disk is necessary for LVM's vg space expansion

I am maintaining a LVM's vg as users' /home directory's storage space. But now I need to add a new 2T sized disk for extending the /home space. I wonder if the partitioning is necessary or not and ...
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1answer
253 views

3TB RAID1 not detected in Hyper-V Core 2012

I'm creating a small server, but I have issues with one RAID config (RAID1-HOST-DATA). As you can see in the image below, everything seems fine. My four physical disk are detected, and two RAID1 are ...
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192 views

Resize RAID 1 Partitions - Software RAID on CentOS

I have made a huge mistake with my server configuration and getting now really in trouble. I'm running a WHM/cPanel server on my CentOS, it's a production server with some websites on. My root ...
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103 views

Ubuntu server becomes unresponsive on hard disk issues despite raid setup

I am running a server on Ubuntu 10.04.4 LTS (Linux xxxx 2.6.32-67-server #134-Ubuntu SMP Wed Sep 24 18:55:00 UTC 2014 x86_64 GNU/Linux) with two hard discs in a software raid 1. I repeatedly had the ...