Installing grub2 on gnulinux software raid sinodun internet. This article describes how to setup a linux system that can boot directly from a software raid1 device using grub. Find answers to software raid 5 ubuntu grub error 2 from the expert community at experts exchange. The problem happens when i try to raid the two drives together and install. This should work with a simple software raid setup. This site is the linux raid kernel list communitymanaged reference for linux software raid as implemented in recent version 4 kernels and earlier. Aug 11, 2016 hi, 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.
In this guide, we demonstrated how to create various types of arrays using linuxs mdadm software raid utility. My experience installing centos 5 and centos 6 is that during the installation phase i configured the raid1 at that time the installation does give you the choice to do this. Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. I have a brand new installation that im trying to install grub2 onto 6 disks, in a linux software raid 5 array. You will have to specify the device name you wish to create devmd0 in our case, the raid level, and the number of devices. How to create a software raid 5 in linux mint ubuntu.
This article will provide an example of how to install and configure arch linux with a software raid or logical volume manager lvm. R410 w software raid always boots to grub shell after. Type grub from prompt and will put you in grubs shell. Im trying to setup and install ubuntu on a raid 1 setup. Then, select configure software raid and add a raid device for swap and root on their respective partitions. 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. The bootloader should be grub2 because the bios is known to. Dec 10, 2016 its pretty straight forward installing an operating system on hardware raid, but what if you want to use software raid. The grub 2 bootloader is included on all currentlysupported versions. This article addresses an approach for setting up of software mdraid raid1 at install time on systems without a true hardware raid controller. Home how to set up software raid1 on a running system incl. Installing grub onto drives that have boot raid partitions. How to set up software raid1 on a running system incl.
Does grub2 really support putting boot on a software raid1 partition with 1. Mar 06, 2015 grub 2 normally writes its bootloader information to an area just beyond the master boot record and before the first partition. Installing grub2 on mdadm software raid in debian wheezy. Nov 28, 2019 following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards. Now lets create our raid arrays devmd0, devmd1, and devmd2. All modules are digitally signed for your security. Solved cant install grub2 on software raid installation. Software raid for root file system boot using grub 2. Then run updategrub, and it will see that you are currently booting from the raid array and configure itself to do so in the future. If you have 2 x 500 gb hdd then total space become 1 tb. Installing grub2 with boot on software raid gentoo forums. Raid arrays offer some compelling redundancy and performance enhancements over using multiple disks individually. May 15, 2007 supported to put the boot partition on with linux software raid.
Use ipvanish to regain control of your data and break free from online tracking. It would be more elegant if you had a hardware raid controller that can do the raid before its booted so that the logical drive presented to grub and linux kernel is already a raided. In my setup, i have two disks that are each formatted in the following way. My guess is that it all depends on the type of raid. How to set up software raid 1 on a running system incl grub. Apr 28, 2017 how to create a software raid 5 on linux. This is a form of software raid using special drivers, and it is not necessarily faster than true software raid.
Installing grub2 on ubuntu with software raid mirroring server fault. Install ubuntu on a software raid array esecuredata inc. It uses multiple hard disks storing the same data to protect against some degree of physical disk failure. By default it tries my first disk, which gives a fatal error. Im working on a personal project and would like to create software raid1 with grub on rhel 4. Im a bit stuck on a new installation where i want to have 2 disks in software raid. Feb 27, 2020 looks like your boot is part of software raid setup thats what md means so i am guessing that is where grub trips up. In bios mbr disks, leave a space at the start of the disk for grub2 to be installed. If the kernel panics because it can not mount the root drive, then the cause is almost certainly that your kernel is missing the mddegradedboot patch see section 4.
If you are using ide drives, for maximum performance make sure that each drive is a master on its own separate channel. To create a raid 0 array with these components, pass them in to the mdadm create command. If i run updategrub, it finds the kernel images on the devsda2 partition present root but not the images on devmd127. Grub2installing community help wiki ubuntu documentation. Software raid 5 ubuntu grub error 2 solutions experts exchange. This article describes how to setup a linux system that can boot directly from a software raid 1 device using grub. Gentoo forums view topic solved installing grub2 with.
In my experience, the installation will complete without any errors, but upon boot you will get to a grubrescue prompt. The red hat customer portal delivers the knowledge, expertise, and guidance available through your red hat subscription. Linux software raid howto with grub bootloader junjis. Installing grub2 with boot on software raid gnu mailing lists. Grub2 configuration debian squeeze page 2 slack brings the team together, wherever you are how to set up software raid1 on a running system incl. I have been setting up a two machines with software raid to use as xen virtual environments.
Aug 16, 2016 your raid 10 array should now automatically be assembled and mounted each boot. This article uses an example with three similar 1tb sata hard drives. Although raid and lvm may seem like analogous technologies they each present unique features. I like to setup grub2 on a gpt softare raid 3 tb hdd. When typical stuff like grubinstall from a rescue console doesnt work. Hi all, im a bit stuck on a new installation where i want to have 2 disks in software raid. The amount of protection it affords depends upon the type of raid used. Also, you dont need to have a separate boot partition. You want to place your bootloader in the mbr master boot record of both your sda and sdb harddisks to ensure you can still boot if you lose one of them. Even with gpt you should still be able to install grub on the drive devsda. I have it ready and mirrored, but cant get grub2 update grub to find it.
It can handle a raid1 type setup but not any other ones that require actual assembling. Now we have to set up the boot loader to boot to the raid drive. Following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards. Grub 2 now can recognize this potential problem and avoid it.
Safely boot multiple windows and linux systems on both gpt and mbr disks. I wanted to migrate this installation to a raid1 setup where there were two disks, four raid partitions md0, md1, md2, md3, in the same. Since raid hardware is very expensive, many motherboard manufacturers use multichannel controllers with special bios features to perform raid. Im working on a personal project and would like to create software raid 1 with grub on rhel 4. Proceed through the installer until you get to filesystem. How to set up software raid 1 on a running system incl. When the root file system is located on a software raid, an initramfs is necessary for automatic assembly. Number start sector end sector size code name 1 2048 1050623 512. I spent some time yesterday building out a uefi server that didnt have onboard hardware raid for its system drives.
For software raid 0, i would think that if the size of grub which is written normally in the mbr is not bigger than the raid 0 stripe size, then it should not be any problem and grub could be written on the first physical drive seen by bios. Install grub 2 on a fake raid system techspot forums. At the grub menu, press e to edit the menu entry and manually change the root kernel argument to point to the raid array and boot from it manually. If the system partitions are on a software raid install grub 2 on all. Setup grub2 on a gpt software raid 3 tb hdd server fault. We just need to remember that the smallest of the hdds or partitions dictates the arrays capacity. Supports both 64 and 32 bit efi firmware as well as bios. Mar 17, 20 having seen our plain and simple install of ubuntu 12. Software raid red hat enterprise linux 6 red hat customer portal. Install ubuntu with software raid mdadm for the installation, im using the live server installer for ubuntu server 18. I tried installing on both of the drives separately and it seemed to work fine.
If i run update grub, it finds the kernel images on the devsda2 partition present root but not the images on devmd127. Some software on nonlinux operating systems also used this embedded area and broke the system by overwriting the grub 2 information on dualboot systems. Grub 2 normally writes its bootloader information to an area just beyond the master boot record and before the first partition. If the system partitions are on a software raid install grub 2 on all disks in the raid. 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. It is used in modern gnulinux distributions in place of older software raid utilities such as raidtools2 or raidtools. If you look at the result of the command df h and you are using the mdmadm software raid 1 then you can only see the devmdx partitions. How do i install grub on a raid system installation. Software raid 5 ubuntu grub error 2 solutions experts. Raid is an acronym for redundant array of independent disks.
Ideally, all three partitions would be setup with a raid 10 to ensure if one drive fails, say sda, the machine can still boot without issues, and the raid can rebuild the boot partition on a replacement drive. It should replace many of the unmaintained and outofdate documents out there such as the software raid howto and the linux raid faq. When the bootloaderstep is entered i selected grub2 each time i. Ive heard rumors that grub2 is able to support boot on raid 0, raid 1 or raid 5, metadata 0. In this tutorial, youll learn how to install ubuntu server 16. For this you will need to know what your kernel version is. The problem is at the end of the installation, it tries to install grub. R410 w software raid always boots to grub shell after linux install appreciate the reply, but i just bit the bullet and installed ubuntu on a flash drive and use fstab to mount partitions of the assembled raid on different parts of the filesystem. It may also be that the md metadata remained behind making the software think theres still a raid setup even if there is not. The article assumes that the drives are accessible as devsda, devsdb, and devsdc. Leave all the screens unchanged and click ok until you are asked where to install grub, select the entry that matches your raid. Having seen our plain and simple install of ubuntu 12. This article will provide an example of how to install and configure arch linux with a software raid or logical volume manager.
This worked well for bios booting since bios just transfers control blindly to the mbr of whatever disk it sees modulo finding a bootable partition flag, etc, etc. Once youre booting into your raid partitions, add the sda14 partitions to the appropriate raids, change the partition types on sda to 0xfd, and remember to clean up the legacy grub installation on sda with grub2install dev sda. Not a software or fakeraid, but a full hardware raid that looks like a normal nonraid disk. After bootstrapping i installed grub2 which died with missing bios boot. When the bootloaderstep is entered i selected grub2 each time i loaded a new raid install. This article refers to the use of the old grub now known also as grublegacy. The bootloader should be grub2 because the bios is known to have issues with grub legacy. We can use full disks, or we can use same sized partitions on different sized drives. In these situations, i always use linuxs md raid1 for the root filesystem andor boot. The combination of raid and lvm provides numerous features with few caveats compared to just using raid. Even if one of the disks in the raid array fails, the system can still boot.
Does grub2 really support putting boot on a software raid5 partition. In order to boot properly during the raid setup, we will need to create a temporary grub config file. At this point the raid module built into the kernel will try to assemble your raid1 array using a nonexistant drive and your secondary, or mirror, drive. If you decide to use the tip described into this article, do it at your own risk, and please do your own tests. I have it ready and mirrored, but cant get grub2 updategrub to find it.
You did mention your raid controller has a 2 tb limit so either obtain a new controller or forced doing this the manual way with software raiding individual. Grub configuration debian etch page 2 dont let creepy ads follow you around. I would think the correct partition to install grub2 on would be md0. My system has 6 scsi drives with 2 scsi controllers. It is used in modern gnulinux distributions in place of older software raid utilities such as raidtools2 or raidtools mdadm is free software maintained by, and ed to, neil brown of suse, and licensed under the terms of version 2 or later of the gnu general public license.