We have a server mounted using raid1, using two disk of 1tb each, and configured by software on centos. The procedure for replacing a disk is documented in several places. To replace the disk, the disk s partitions need to be removed from the raid array. I will use gdisk to copy the partition scheme, so it will work with large harddisks with gpt guid partition table too. Actual screen shot from terminal of steps taken during rebuild on 10june2010 on debian lenny linux 1 check the partitions layout on the current hard disk srv1. Softwareraid 0, 1, 5, 6 oder 10 unter ubuntudebian linux. The following screenshots show how you setup raid during the centos setup. Replicate changes in the same way to the second disk. This tutorial describes how to identify a failing raid drive in a mythtv pvr and outlines the steps to replace the failing drive with no loss of data or recordings. Replace of a failed disk in a raid controller hpux.
In this example, we use virtual machine qemu or kvm. I have a dell poweredge 2950 that is configured to have 5 sata drives in a raid5 software configuration. Replacing a failed mirror disk in a software raid array. Disk partitions devhda1 and devhdc1 will be used as the members of the raid array md0, which will be mounted on the home partition install the mdadm package. A drive has failed in your linux raid1 configuration and you need to replace it. In this example, we have used devsda1 as the known good partition, and devsdb1 as the suspect or failing partition. Linux partition layout with raid1 and lvm experiencing. I have spent countless days attachingdetaching molexsata power cables, rebooting machines and trying hundreds of edits and commands. Disk partitions devhda1 and devhdc1 will be used as the members of the raid array md0, which will be mounted on the home partition.
This guide shows how to remove a failed hard drive from a linux raid1 array software raid, and how to add a new hard disk to the raid1 array without. This has the other benefit of having a backup of your disk partition table. There are many howtos available on the internet that describe several different schemes for utilizing linux software raid to provide mirroring of boot, root, and even other partitions. Then a quick tail syslog assured me that the device was recognised, and registered as sda. A raid 1 configuration is a simple mirror of two hard discs. Ive just purchased two new 500gb drives to replace the corrupted drives and simply cannot afford a hardware raid so have to. For details about the different raid levels check the wikipedia raid page. Replace the raid device, disk device, and hostchannelidlun numbers with the. Rebuild the system is rebuilding the array, and is thus at risk of data loss until the array has completely rebuilt. How to replace a failed disk of a degraded linux software raid. Before proceeding, it is recommended to backup the original disk. Use mdadm to fail the drive partitions and remove it from the raid array.
How to replace a defective drive from a ubuntu raid 10. The example below shows how to create a software raid1 array on debian systems. After each disk i have to wait for the raid to resync to the new disk. Ideally with raid 1, raid 5, etc once can easily do a hot hdd swap as they support mirroring at the hardware level but to do the same on a software raid 1 becomes tricky as ideally an os shutdown is needed to avoid any application impact during the hdd swap. Replace of a failed disk in a raid controller hpux hi i have a smart controller, two port. Identifying and replacing a failing raid drive linux crumbs.
In this article you will get to how to check which device is faulty and how to remove them from raid array. Weitere informationen sind unter usrsharedocmdadmreadme. Identifying and replacing a failing raid drive summary. This means youll need to run grubinstall again if you replace one disk. Replace a failed disk in a disk utility raid 1 ask different. If its a software raid you will be able to get the raid information with the builtin disk management tool, typically the disks will be dynamic and they will have the same drive letter and the windows raid tools will be available, if these are not there you definitely do not have software raid. The workflow of growing the mdadm raid is done through the following steps. The problem is one of the drives failed and then when i simply replaced the drive and bounced the machine, it booted up into a grub rescue prompt. Run fdisk on each disk and create a new partition, type fd linux raid auto sudo fdisk devsda sudo fdisk devsdb 3. Can i just plug out the failed disk and insert the unassigned disk to replace the failed member. During partition creation process select physical volume for raid as partition type.
Previous post how to setup software raid for centos next post how to setup sofware raid in freebsd. Rebuilding raid 1 array in linux with a new hard disk. Debian replace failed hard drive in software raid 1. How to replace faulty device from raid array tecadmin. One of the drives appears as failed, so i unmounted the raid, replaced the drive and plugged it all back in. When the disk causes problems but has not yet failed completely, it is still part of the raid. The wd red disk are especially tailored to the nas workload. Replace hard disk from software raid experiencing technology. Siju rebuilding raid 1 array in linux with a new hard disk after a disk fault. Recovering from windows software raid failure web and.
Just leave it zero if you dont put up any spare hard disk for your raid. Howto create software raid 1 mirror on debian linux. For this setup i decided to create a software raid 1 with the 2 discs in the system. To summarise the raid devices which use sda, i used this command. Replace drive in a windows 7 raid 1 microsoft community. This guide shows how to remove a failed hard drive from a linux raid1 array software raid, and how to add a new hard disk to the raid1 array without losing data. How i replaced a failed disk in a raid1 array without downtime.
How to perform disk replacement software raid 1 in linux mdadm replace failed drive. Simply put, i needed to replace the disk and rebuild the raid 1 array. I have had no problem with ubuntu and the same installation from september 2010 works. Create empty partition table on each disk used to create raid1 array. Select the replacement hard drive and click rebuild.
Software raid 5 in ubuntudebian with mdadm zack reed. This howto describes how to use software raid under linux. Lvm is using devmd devices, and the respective devsd devices are locked by software raid for exclusive access. Client has a tight budget, and with a best effort sla not in production, fine with me. Thomas has been working for thomaskrenn since 20 and is mainly responsible for the maintenance of the thomaskrenn wiki. I recently had to do a disk replace in a software raid 1 system, running on a debian kvm host. In this example, we have used devsda1 as the known good partition, and. In many cases hardware raid controllers are either too expensive or simply unavailablef or a particular system.
Create the same partition table on the new drive that existed on the old drive. Replacing a failed mirror disk in a software raid array mdadm. It was a fun and challenging task to do from only using a terminal window. Replacing a failing raid 6 drive with mdadm enable sysadmin. The raid is now not redundant and the data is what matters. Falko timme writes this guide shows how to remove a failed hard drive from a linux raid1 array software raid, and how to add a new hard disk to the raid1 array without losing data.
I then have to grow the raid to use all the space on each of the 3tb disks. Software raid 5 in ubuntudebian with mdadm 9 min read. The post describes the steps to replace a mirror disk in a software raid array. To remove the disk from the raid array, the partitions need to be marked as failed manually first. How to configure a linux system to boot from a raid1 device using grub, such as the system can boot even if the boot disk fails orand is removed. If a brake disk wears beyond the safety limit in your car you replace at least. While the system was still running on the other still working disk i needed to replace the failing disk with a new one. How to perform disk replacement software raid 1 in linux. Now disk utility reports that one of the slices is missing from the raid, and it shows my new disk separately on the list to the left. I was recently asked on the ubuntuforums how to replace 3 1tb drives in an mdadm one at a time. Replace faulty disk of raid array in rhel os youtube. Before removing raid disks, please make sure you run the following command to write all disk caches to the disk. Im not aware of support in grub to declare two disks as being in a raid1 array so that grubinstall would automatically write to both. The below image is showing that devsdc1 disk has been marked as faulty and new disk attached has taken place of that with complete data sync.
This document explains how to set up debian gnulinux on a computer with your root partition on a raid volume managed with lvm. Replacing a failed drive in a linux software raid1. Fail, remove and replace each of 1tb disk with a 3tb disk. Grub to the new hard drive mbr, damage disk drive, failed disk drive, failed hard. Would that be the correct and safe order of replacing a.
Replacing a failed hard drive in a software raid1 array. For hardware raid you basically pretend a disk failed, rebuild, and do the same thing for the other. Here is what i did to get my system up and running again. The exception to this is if you are using software raid via windows which doesnt mirror the entire drive the boot partition or files needed to boot arent mirrored to the second drive so if the primary fails, the second wont boot without doing some sort of repair on it. How to replace a failed harddisk in linux software raid. Thomas niedermeier thomas niedermeier, working in the knowledge transfer team at thomaskrenn, completed his bachelors degree in business informatics at the deggendorf university of applied sciences. There is a new version of this tutorial available that uses gdisk instead of sfdisk to support gpt partitions. It is amazing how solid the software raid in ubuntu was implemented. First disk lets call it sdb is dead and we took it away to replace it in a near future, while we decided to boot up the server using the mirrored disk sda. How to configure software raid1 during installation process. Email with 4 easy steps replace broken hdd on linux machine which is configured for software raid1.