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

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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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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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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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21 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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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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73 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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1answer
70 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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4answers
136 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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40 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
178 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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145 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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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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Boot from software RAID 1 on Windows Server 2008 R2

I have a Windows Server 2008 R2 x64 system with a single hard drive, and I have a spare hard drive of same size/model that's not being used. I was thinking about dropping in the new drive and setting ...
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1answer
531 views

RAID controller won't rebuild RAID-1 array

I have a RAID-1 array on a desktop computer. The RAID controller is a 3ware 7006-2. Recently the controller has been reporting ECC errors from one of the drives. It was able to correct all of those ...
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391 views

How do I rebuild my software RAID1 array after a drive replacement?

So I have 1and1 dedicated host with RAID 1 setup. One of the drive went bad, and they had just replaced it with a good one. Now I need to the build, but I'm not sure which drive is the old one, and ...
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246 views

HDD compatibility to rebuild for RAID

Last year we build a RAID 1 with Western Digital 2 TB drive model number WD20EARS. Unfortunately one of the drives failed. We are unable to find any new drives of the same model number. What do we do? ...
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793 views

RAID1 rebuild fails due to disk errors

Quick info: Dell R410 with 2x500GB drives in RAID1 on H700 Adapter Recently one of drives in RAID1 array on server failed, lets call it Drive 0. RAID controller marked it as fault and put it offline. ...
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474 views

3ware 9650SE-2LP “sync” after a drive failure

I have a 3ware 9650SE-2LP card that was set up to mirror two 1 TB disks (let's call them Disk A and Disk B). A couple of months or so ago the array stopped working (gave me an error at boot-up saying ...
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2answers
11k views

Proliant RAID 1 Rebuild Questions

I have a HP Proliant ML350 G5 server that experienced a power supply failure overnight. The power supply was replaced but unfortunately it got restarted with only 1 disk in the RAID 1 set plugged in. ...
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Rebuilding RAID1 in Ubuntu

I had my second HD in my RAID1 come up with bad sectors. So I got another drive and pulled out the bad sector drive and put the new drive in. With the original working RAID1 drive in the computer it ...
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Files missing after RAID1 restore

I have encountered unpleasant situation. Given mdadm RAID1 of 2 HDD on server. Yesterday one of HDDs completely dies, other shows bad SMART status but was in accessible state. Mdadm showed "clean, ...
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Setting up software RAID 1 on System Partition

I have a Windows 2012 R2 Essentials box I'm building (should be the same concerns as a Server 2012 or Server 2012 R2 box). I'm attempting to mirror the system disk (identical 750GB SATA drives) but I ...
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1answer
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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 ...
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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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6answers
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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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155 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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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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299 views

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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2answers
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mdadm raid 1 grub only on sda

I just finished setting up a CentOS 6.3 64bit server with mdadm however a lightbulb went on and I realised grub would only be installed on the first drive which is about as much use and an ashtray on ...
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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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184 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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2answers
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How to delete removed devices from a mdadm RAID1?

I had to replace two hard drives in my RAID1. After adding the two new partitions the old ones are still showing up as removed while the new ones are only added as spare. I've had no luck removing the ...
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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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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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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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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
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RAID 1+0 redundancy and data-loss recovery capability against RAID 1

I have a HP ProLiant server with two SCSI drives. I wanted to set up a RAID 1 array but the RAID configurator only allowed me a RAID 0 or a RAID 1+0 array. When either of my drive fails can I recover ...
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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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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
241 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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2answers
673 views

LVM mirror with data and logs mirrored on same 2 devices

I'm trying to set LVM mirroring with only 2 devices. It works perfecly when I add third device for mirrorlog, or use corelog. But with only 2 devices and --alloc anywhere LVM nearly always creates ...
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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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What's the difference between “mirror” and “raid1” in LVM?

On the lvconvert(8) man page it says: --type SegmentType Used to convert a logical volume to another segment type or to explicitly state the desired RAID1 segment type ("mirror" ...
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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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316 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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174 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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353 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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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 ...