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

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Converting BTRFS filesystem to RAID1 fails with “Inappropriate ioctl for device”

I had a ~1.6TB BTRFS volume on a single partition, to which successfully I added another freshly created and formatted partition (on another device) of exact same size with the intent of mirroring ...
6
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2answers
1k views

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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1answer
60 views

raid 1 need to move folder in rescue shell

Good day All. I have a remote server running raid 1 which I connect to using ssh keys. I accidentally moved the /root/.ssh folder and need to put it back so I can log on again. The people I rent off ...
0
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1answer
425 views

removing software raid without data loss

i wonder if/how i can stop my linux machine using the installed software raid, without loosing any data. All information i found was about removing the superblock of any hdd, and this is o/c what i ...
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1answer
349 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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2answers
76 views

manually editing shadow file on disk from raid1 array

At work we have a machine to which root password has been lost. I have pulled out the disk and mounted it to another computer. Now I think the next step should be editing root password in the shadow ...
6
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2answers
10k views

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 ...
4
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2answers
6k views

DegradedArray event on /dev/md1

This morning I got this message: This is an automatically generated mail message from mdadm running on A DegradedArray event had been detected on md device /dev/md1. Faithfully yours, etc. P.S. ...
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5answers
508 views

Using RAID1 to assist in offsite backups

I'm trying to set up an offsite, offline backup procedure for my company's critical information. We already have an in-office redundancy backup set up using RSYNC that backs everything up onto two ...
0
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1answer
887 views

New HDD swap in SAS 6 ir shows it is missing?

SETUP: Dell Poweredge T410 with Windows Server 2003, SAS 6 IR Raid-1. Both the original drives were Dell Certified Seagate Barracudas for enterprise, 250gb. The new HDD is a Seagate Barracuda 500gb, ...
0
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2answers
513 views

Raid 1 and Latency

I am aware that RAID comes with certain write penalties, etc and that varies at different levels. I am trying to figure out how latency is affected in RAID 1. From my SAN, I can look at the number of ...
0
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1answer
242 views

Will Windows Server 2008 R2 software RAID volume with “Failed Redundancy” be available during resynching?

In addition to this question: Windows Server software RAID volume constant "Failed Redundancy" I have this problem on my production server too, but im concerned about resynching. If I ...
0
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2answers
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 ...
4
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1answer
3k views

How do you set up RAID1 with both disks bootable on Debian/Ubuntu?

In Debian 6, new installation, what is the recommended way of setting up a software RAID1 array so that the system is bootable from both disks? I have heard that people that don't know what they are ...
2
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2answers
269 views

Copy entire filesystem in a folder where a raid-1 array is mounted

I am trying to migrate from a single disk drive system to a double disk drive software raid-1 system that already has a running system on it. Meaning that formatting and having a new installation of ...
2
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0answers
232 views

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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2answers
82 views

Ubuntu 9.10 won't reboot after replacing a failed drive

Hello Serverfault community. I hope someone can shed light on a peculiar problem I am having with an Ubuntu 9.10 server install. I am not a Linux expert but have the responsibility of fixing the box ...
0
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2answers
396 views

Device cannot be added on software-raid-1 array on Ubuntu 12.04

Unfortunately all tutorials I have found online until now on how to setup software-raid-1 are outdated on ubuntu 12.40 My target is to setup it on a system with a secondary disk drive that is already ...
2
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1answer
1k views

RAID 1 configuration does not show after installation

I used the HP Smart Array Configuration utility to setup a RAID 1 array (hardware P400 controller) using four disks. I created 2 logical drives with physical hard drive 2 mirroring drive 1 (o/s ...
3
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2answers
159 views

RAID1: One RAID per Partition or Partitions on RAID device?

What is better suited for a normal Server: several partitions, which are bundled as several RAID1 devices (/dev/md0, /dev/md1, ...) without any partitions, which are not mirrored. one big /dev/md0, ...
0
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2answers
151 views

New harddisc in RAID fails after only a few days

Last weekend I had to replace one harddisc in a RAID 1 on a PERC/5i controller because it reported it as failed. After replacing the disc it worked for 5 days and then the controller started ...
0
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1answer
2k views

Is it reasonable to make a RAID-1 array with a ram disk and a physical disk to maximize read performance and protect data?

In one of the answers on SO (I forgot which one) I've seen a suggestion to make a RAID-1 array composed of a RAM disk and a physical partition. By adding the physical partition with --write-mostly and ...
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2answers
315 views

RAID 1 after install and two controllers

I have question regarding RAID 1. Can I setup software RAID 1 after having installed the first drive and setup ubuntu 12? I know that during server install and partitioning I can select RAID and setup ...
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1answer
391 views

Restoring data from a failed and possibly partly overwritten mdadm raid1

I have a failing hard disk (let's call it sda) which contains, among other things, a 1.5 TB partition (let's call it sda3). There is another disk (sdb), which has a 1.5 TB partition (sdb1) as well. ...
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2answers
116 views

Replace RAID1 Disc - things to consider

One of my RAID controllers is complaining about a harddrive failure: -- Controller informations -- -- ID | Model c0 | PERC 5/i Adapter -- Arrays informations -- -- ID | Type | Size | Status | ...
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2answers
348 views

How do I find out which disk in a multi-disk mdadm RAID1 triggered a rebuild?

I'm using mdadm for several RAID1 mirrors. md7 is an N-way mirror consisting of 3 spinning disks (all flagged write-mostly) and an SSD: md7 : active raid1 sdd1[0] sde5[3](W) sdf5[4](W) sdc1[1](W) ...
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1answer
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Configure raid for IBM x3200 M2

I have a x3200 server and I have planing to use raid 1 for mirroring Sata Hardisk . I am searching on google to find raid server manager for x3200 , but no luck . Is there another way to configure ...
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2answers
379 views

Ubuntu Server - RAID1: Operating System not found

I'm trying a RAID1 on Ubuntu Server 12.04 in virtual machine and I followed the post: RAID1: How do I "Fail" a drive that's marked as "removed"? I added two disks and created ...
3
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2answers
776 views

From which plex am I booted from on raid?

I have a server with mirrored boot volume. It is software raid 1 in Windows Server 2008 R2. I do not have physical access to the server. I am looking for a way to check which disk is a boot drive. I ...
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2answers
1k views

Linux Software RAID1 Rebuild Completes, but after reboot, its degraded again

I have been beating my head with an issue here, and I'm now turning to the internet for help. I have a system running Mandrake Linux, with the following configuration: /dev/hda - This is a IDE ...
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2answers
3k views

NAS device claims drive in a RAID is degraded but S.M.A.R.T. says it is fine

I have a Synology DS213 with two 600GB drives in RAID 1. Last night the device reported that my second drive had become degraded and that I should replace it. When I ran a extensive S.M.A.R.T. test ...
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2answers
842 views

How to Detect Hard Disk Failure

I have a software RAID 1 setup in my CentOS 6.2 and set to be bootable in any of the HDDs in case one of them fails. Questions: How can I recognize if one of the HDDs fail? or early signs of ...
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1answer
170 views

Hardware RAID in CentOS 6.2

I have a ServeRAID-BR10il SAS/SATA PCIe Controller RAID O and 1 Standard. Do you have any suggestions how to install it in CentOS 6.2? All the tutorials I found are only software RAID. Hope you guys ...
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1answer
88 views

Installing MySQL in CentOS 6.2 with RAID 1

Is the installation of MySQL in CentOS with RAID1 the same as that of none? If not, what are the changes in the process of installation?
7
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1answer
778 views

Why did my zpool replace never finish and what should I do now?

I have a ZFS zpool with two disks in a mirror configuration, da0 and da1. da1 failed, and so I replaced it with da2 using zpool replace BearCow da1 da2 This ran for a few hours, during which zpool ...
6
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2answers
594 views

RAID1: Which disk will be mirrored?

How does a RAID1 system determine which disk to use as the source and which disk to use as the destination when mirroring? Assume for instance the following scenario: A RAID1 array is created with ...
2
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1answer
1k 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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1answer
6k views

Dell Open Manage message in Windows Event Log, should I be worried?

I have a Dell T110 server with a SAS 6i/R controller and two hard disks in RAID 1. Ocasionally a warning appears in the Windows Event Log with the following message: SAS port report: SAS wide port ...
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1answer
281 views

Best practice for replacing failing drive in a TWO Domain Controller domain

Hi I have a two domain controller domain and i will refer to them as DC1 and DC2, here is some info on them. DC1 is or has all FMSO roles DC2 serves as another Domain Controller for replication DC1 ...
2
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1answer
122 views

Dead Linux server - need help and options

I have a Dell PE 1950 with 2 SATA drives in a software RAID1. OS is CentOS 5.5 (2.6.18.x). Starting this afternoon we received HW errors (something on the bus is bad, E171F) and the machine became ...
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1answer
433 views

install boot with raid 1 in 3 TB disks

I'm trying to install /boot in a RAID 1 using 3 TB disks. As the RAID partition do not let you manage partitions than more than 2 TB, CentOS automatically configures the partitions using GPT. My ...
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1answer
177 views

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 ...
0
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1answer
93 views

Linux Software RAID 1 issue

I recently had a HDD failure on a SW RAID1 system (Debian 6.0) and what happened was that the active HDD looked like it had some badblocks which somehow propagated to the HDD that was still OK but it ...
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1answer
152 views

grub2 failing to detect md0 for /

I recently set up a raid 1 array. Both / and /boot are on md0 (sda, sdb). everything was working when it was in degraded mode before I synced the two disks together. It was booting from grub2 on ...
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1answer
561 views

Ubuntu server boot degraded raid

I've installed Ubuntu 12.04.1 in a new server and set up the 4 hard drives with 3 RAID 1 devices, the configuration is such that the first two drives have md0 (swap space) and md1 (/) with the third ...
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2answers
364 views

Ubuntu 12.04 Server Software RAID1 - Faulty Spare - Smart Output Passed - Confused

I think I'm having an issue with one of the hard drives on my array and I'm just trying to troubleshoot what's happening. Its saying Faulty Spare and then after reboot it just says removed: ...
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1answer
1k views

mdadm and blkid give different uuid

We recently replaced a hard disk in a server and reinstalled the operating system (Centos 6) The raid rebuilds itself every boot; /dev/md2 is losing a disk each time apparently. Always the same ...
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1answer
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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1answer
403 views

Is there a way to prevent a SW RAID 1 from degrading?

I have a number of Debian servers in a datacenter and from time to time I notice that the software RAID 1 was degraded. While the re-sync process starts automatically and I don't lose any data I find ...
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7answers
823 views

Which RAID/LVM configuration for new 2x8TB file server is safest?

I just built a totally new PC to be a fileserver. It has one 60gb SSD for OS (ubuntu 12.04), and 8 2tb data drives in it. I am looking for the safest, most stable way to set up a single giant ...