When the raid array has finished to resync, run again grub to install the loader on the new partition with root hd1,0 and setup hd1. Centos offers 3 types of partitioning scheme for a manual partitioning. Software raid1 centos install asterisk freeswitch guides. R410 w software raid always boots to grub shell after linux. If your server is located in a remote area, the best practice may be to configure this to occur automatically. Linux system has builtin support for software raid, through md devices aka linux. For default nonsoftware raid centos install skip to the next section. Unlike earlier versions that used lilo as the default boot loader, these did not make the 2nd drive bootable but at least i was fairly confident that if the first drive failed i could use the install cd in rescue mode to fix up the 2nd one and go on. This tutorial goes over the very basic of how its done. After first boot, consider executing dpkgreconfigure grubpc or dpkgreconfigure grubefiamd64 on efi systems, and install to all devices. This post illustrates how to reinstall the grub loader on centosrhel 5 or 6. When asked to install bootloader, install to first device.
For linux text based install it is a bit different and less. Sep 12, 2015 in case your next hdd wont boot then simply install grub to another drive. Hello all, i am trying to setup a raid 1 on my system that has 2 identical ide hard disks. Configuring software raid 1 in centos 7 linux scripts hub. How to setup a software raid on centos 5 inetservicescloud. I hope to address those here and provide an endtoend guide for myself and others wishing to do similar activities. When the bootloaderstep is entered i selected grub2 each time i. If the default hdd fails then raid will ask you to boot from a degraded disk. I cant help with installing grub now but what i did to get my raid running is i followed this instruction.
Solved installing and using grub on lvm your first partition starts at block 63. May 25, 2019 run mdadm create verbose devmd0 level1 raid devices2 devsda devsdb run the graphical installer tryng to install ubuntu on devmd0 i tried at work with a physical workstation and the installer t asked me to create a small biosboot partition, because of the gpt disk that was not asked to do it in my vm test on vmware workstation. Raid 10 is a combine of raid 0 and raid 1 to form a raid 10. Regarding installing grub to the second drive, i find native grub installations i. How to recover or rescue corrupted grub boot loader in centos 7.
For default non software raid centos install skip to the next section. This procedure assumes your using the gui install method. If you have a raid card, be aware that some bios types do not support booting from the raid card. For additional information about installing grub, see the gnu grub manual and the grubinstall8 man page. Install grub files in directory boot grub of current partition. Task is install only centos with raid 1 configured. Under some rare conditions, you may get a grub loader corruption. This is why its a good idea to install grub on every disk. I select manual set and create the paritions and software raid and assign ext 4 and swap. Mar 21, 2016 now lets create the raid, this should be similar for larger raid sets raid 5,6,10, the disk we are using we set as missing, the other one we are going to add. On some systems its grub2install instead of grubinstall. In such a case, the boot partition must be created on a partition outside of the raid array, such as on a separate hard drive.
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. Close all port forwards in the firewall to the server ip we are about to install install centos from dvd by booting from it. You can use whole disks devsdb, devsdc or individual partitions devsdb1, devsdc1 as a. Below are some of the symptoms you would see when there is a grub loader corruption. Its is a tool for creating, managing, and monitoring raid devices using the md driver. Standard partition which can contain a file system or swap space or provide a container for software raid or an lvm physical volume. It can be used as a replacement for the raidtools, or as a supplement. I have configured raid controler, but centos installer didnt recognized it, and stopped installation.
The most important tool for setting up raid is mdadm. In case your next hdd wont boot then simply install grub to another drive. Mar 26, 2014 this article addresses an approach for setting up of software mdraid raid1 at install time on systems without a true hardware raid controller. Apr 05, 2005 12 replies with centos3, fedora12 i have been able to put boot on a raid1 partition and have it boot normally. If the two disks are devsda and devsdb, run both grubinstall devsda and.
In our earlier articles, weve seen how to setup a raid 0 and raid 1 with minimum 2 number of disks. Its more like you have to put it in grubs way, so that grub trips over it and uses it. Grub has gotten so bloated that it now writes to not only the mbr, but also to the space from the mbr after sector 0 to the start of the first partition, which these days is sector 2048. I have installed ubuntu, debian and centos dozens of times, and each time i get sent to a grub shell not rescue. Centos 6 wont bootload grub on software raid devmd0 posted by curtis k in administration dec, 12 2012 1 comment if youve just installed centos 6 on software raid and it wont boot off devmd0, try the following. How to set up software raid1 on a running system incl. I get through the initial setup of the, hostname, fully quilified domain name, root password, new userpassword setup, and i get to the partioning and software raid configuration.
Create an 100mb software raid partition on sda and sdb for boot. Customize partitions and remove all partitions, including lvms, for a fresh start. I did all steps exactly as in video in my post, but os didnt boot. Reinstall grub devmd0 may be different for you depending on how you configured your software raid grubinstall devmd0.
Solved installing and using grub on lvm installation. The following assumes you have setup two raid devices, md0 and md1, with. It should default to installing grub to devsda, click next. Install boot loader in master boot record of first hard disk. Shrink the last partition, if needed, in order to obtain the 1 mb. If you decide to use the tip described into this article, do it at your own risk, and please do your own tests. If grub was already installed on the hard drives from a previous version of centos that was running software raid partitions, the system will boot after installing 5. Logical volume lvm partition which generates an lvm logical volume which is helpful because it improves the performance when using physical. If you stop the boot at the grub selection menu, then you can get a grub prompt c and manually set up the first boot to the degraded raid like this. The same instruction should work on other linux distribution, eg. Oct 26, 2017 also, if you are using a live cd install, do not deselect grub install. Re install grub devmd0 may be different for you depending on how you configured your software raid grub install devmd0.
But when it gets to install the grub boot loader part i get the following. In this case, boot is not in software raid 1, right. Centos 6 wont bootload grub on software raid devmd0. Otherwise grub will respond with filesystem type unknown, partition type 0xfd and refuse to install. Using grubinstall devsdx is probably how it is intended to be done. Aug 11, 2016 when i perform a software raid 1 or raid 5 installation on a lan server with several hard disks, i wonder if grub already gets installed on each individual mbr, or if i have to do that manually. Install centos using the standard installer on the first hard disk, devsda. This article addresses an approach for setting up of software mdraid raid1 at install time on systems without a true hardware raid controller. To setup raid 10, we need at least 4 number of disks.
Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. Build the software raid1 using mdadm in degraded mode, with devsda as the only drive. Install grub files in directory bootgrub of current partition. Before we can add disks to a devmd device we need to change the partition type to linux raid auto type fd or in my case this was linux raid type. Select manual partitioning during the installation and leave at least 1 mb at the very end of the disk unpartitioned. For information about the efi system partition, see section 9.
Using grub install devsdx is probably how it is intended to be done. How to setup a software raid on centos 5 centos wiki. Once you are booted in to rescue mode, select the start shell option. Make sure that your grub configuration doesnt hardcode disks like hd0, but instead searches for the boot and root filesystems uuids. This article will guide you through the steps to create a software raid 1 in centos 7 using mdadm. How do i install grub on a raid system installation. Jan 06, 2017 2 the raid drivers installed allow you access to the raid volume created in the raid controller bios since centos did recognize the raid 1 on the controller during os install, i assumed that necessary driver files were loaded automatically. The installer will ask you if you wish to mount an existing centos installation, you must refuse. The grub menu is not shown when booting the server 2. Software raid 1 setup on centos using grub boot loader. Install boot loader in first partition of first hard disk. In trying to set this up, ive encountered several pitfalls and complexities. Now lets create the raid, this should be similar for larger raid sets raid 5,6,10, the disk we are using we set as missing, the other one we are going to add.
How to install centos 8 step by step with screenshots. This post illustrates how to re install the grub loader on centos rhel 5 or 6. This will be helpful when one hdd fails theres still a working grub. What is the correct way to install software raid 1 in centos 6. Centos 7 install software raid on large drives error. When i perform a software raid 1 or raid 5 installation on a lan server with several hard disks, i wonder if grub already gets installed on each individual mbr, or if i have to do that manually. The grub bootloader is also configured in such a way so that the system will still be. Here we will use both raid 0 and raid 1 to perform a raid 10 setup with minimum of 4 drives. The above commands helped me fix this issue on centos 6.
Also, if you are using a live cd install, do not deselect grub install. For information about the efibootmgr tool, see the efibootmgr8 man page. Installing grub red hat enterprise linux 6 red hat. I want to install hypervisor and add vms, but is not my call. Centos 7 install with uefi boot and software raid1.
Yes, you have a backup copy, but grub doesnt know it is there. If youve just installed centos 6 on software raid and it wont boot off devmd0, try the following. Installing the prerequisites and examine the drive. So i set storage options to default, and tried with software raid. Solved cant install grub2 on software raid installation. It is necessary to use an internal hard drive for partition creation with problematic raid cards. Boot from the centos installation disk in the rescue mode. Using your centos install media, boot in to rescue mode.