Im trying to setup and install ubuntu on a raid 1 setup. I decided to run gentoo as the dom0 os because there is lots of good documentation for it and it has always been my favorite gnu. In advanced storage the necessary steps are documented on how to install and use grub2 on more advanced storage situations, such as software raid, logical volumes or encrypted file systems. Configuring software raid1 after installation of ubuntu 16. You can easily restore grub2 from a ubuntu live cd or usb drive. Since raid hardware is very expensive, many motherboard manufacturers use multichannel controllers with special bios features to perform raid. This process is different from restoring the legacy grub boot loader. This guide explains how to set up software raid1 on an already running ubuntu 10. You will be asked to partition disks at this point. Hi all, im a bit stuck on a new installation where i want to have 2 disks in software raid.
This means i am limited to using the legacy bios and a software raid in the setup. I have been setting up a two machines with software raid to use as xen virtual environments. If grub2 breaksfor example, if you install windows after installing ubuntu, or overwrite your mbryou wont be able to boot into ubuntu. If you want to see the menu during boot you need to hold down shift key. Now we need to make a note of the raid array device on which your linux partition exists it will be listed as a hard disk which is the total size of your array, and is usually the same as your. I have a brand new installation that im trying to install grub2 onto 6 disks, in a linux software raid 5 array. The problem is at the end of the installation, it tries to install grub.
Setting up raid on an existing debianubuntu installation. The grub2 bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails no matter which one. It looks like currently most os installers insist on putting boot on a nonraid partition or the kind of raid1 partition that looks like a nonraid partition, even the installers that support raid5 and grub2 im guessing this limitation is a historical relic leftover from grub1. When i first tried booting it, the grub screen came up, but selecting any kernel resulted in an endless stream of system messages, and i never got to login prompt. Now we have to set up the boot loader to boot to the raid drive. Hardware raid is generally faster, and does not place load on the cpu, and hardware raid can be used with any os. If you are not sure which it is, launch gparted included in the live cd and find out. Debian server not booting after software raid 1 array degraded.
Grub 2 will overwrite the drives boot information and place the grub 2 files in the appropriate locations. Booting ubuntu with a failed device in a raid1 will force the system into a recovery console. Despite the terminology, fake raid via dmraid is a robust software raid implementation that offers a solid system to mirror or stripe data across multiple disks with negligible overhead for any modern system. Discover all the available rescue options to take in control your machine again.
The goal4 x 4tb hard drives in raid 10 with ubuntu 18. The most important tool for setting up raid is mdadm. 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. Home how to set up software raid1 on a running system incl. Use ipvanish to regain control of your data and break free from online tracking. Find answers to software raid 5 ubuntu grub error 2 from the expert community at experts exchange. This article describes how to setup a linux system that can boot directly from a software raid1 device using grub. For this you will need to know what your kernel verion is. My understanding is that grub1 doesnt know anything about raid and so cant boot off any kind of raid array.
How to repair, restore, or reinstall grub 2 with a ubuntu. Even if one of the disks in the raid array fails, the system can still boot. The mdadm utility can be used to create and manage storage arrays using linuxs software raid capabilities. Mount the partition your ubuntu installation is on. Now that both drive are ready, it is time to select configure software raid. Installing grub2 on ubuntu with software raid mirroring server fault. I have achieved a raid0 dualboot, and break 1gbsec in both windows and linux. The user should select a drive on which ubuntu and grub 2 will be installed. Software raid 5 ubuntu grub error 2 solutions experts. In order to boot properly during the raid setup, we will need to create a temporary grub config file.
In my testing, lilo absolutely refused to be installed on a raid1 array. If the raid is recognizedassembled, then in devmapper you should see a file called control and then a file with a name like md the whole raid device, plus md1, md2, md3 representing any partitions in the whole raid device. The machine is an older shuttle box ive had tucked away in various places over the past few years the plan was to disable the bios fakeraid, install ubuntu on one of the drives, copy my data over to it and then have the other disk join the new linux software raid array. Neither grub nor lilo would install, so i carried on without a bootloader install. The rest of the options you will have to discover them by yourself. In configuration variables an exhaustive list of grub2 configuration variables, as.
For a normal installation of debian or ubuntu, you can refer to. Restore ubuntu uefi boot entries after bios update. Grub2installing community help wiki ubuntu documentation. But when you sit down, you run into this seemingly unsolvable problem you just cant seem to wrap your head around, even though it should be. In this tutorial i will show you how to reinstall grub2 bootloader on a ubuntu system with efi partition. The best way to ensure that grub2, the default bootloader in debian and ubuntu. The bootloader should be grub2 because the bios is known to have issues with grub legacy. Make sure that your grub configuration doesnt hardcode disks like hd0, but instead searches for the boot and root filesystems uuids. However, the mdadm tool is a single that is much more powerful. From my reading of ubuntu discussions, i think u uses mdadm behind the scenes for your install.
Replace the xy with the drive letter, and partition number, for example. I do not issue any guarantee that this continue reading how to set up software raid1 on a running. It looks like currently most os installers insist on putting boot on a non raid partition or the kind of raid1 partition that looks like a non raid partition, even the installers that support raid5 and grub2 im guessing this limitation is a historical relic leftover from grub1. If playback doesnt begin shortly, try restarting your device. Optionally with a software raid array, mount the efi partition on the second hard disk and execute grubinstall bootloaderid ubuntuhdd2 devsdb. This guide explains how to set up software raid1 on an already running lvm system ubuntu 10. Unable to install grub to software raid array in ubuntu. Im not aware of support in grub to declare two disks as being in a raid 1 array so that grub install would automatically write to both. Installing grub2 on gnulinux software raid sinodun. Here there is a little video tour in order to discover most of super grub2 disk options. Also, after adding the original disk to the raid array and rebooting i found myself in grub rescue mode. My hardware raid controller is broken, so on the ubuntu partitioning manager i created a software raid 0 array. Most users who are familiar with linux software raid are also familiar with raidtools.
When one of the mirrored disks fails, and mdadm marks the raid degraded, it becomes impossible to reboot the system in an unattended manner. As i mentioned earlier, the software raid configuration can be quite troublesome and time consuming, but at least it is reliable and save a lot of cost when buying a hardware raid instead. Raider is a tool to automate linux software raid conversion. Grub vs grub2 bootloader learn the main difference. Boot from the ubuntu live usbcd and select the option try ubuntu without installing check if efi is enabled in bios. Whether you want to recover access to your unbootable gnulinux or you have forgotten your windows password rescatux is for you. I had to partition the drives with parted first and make a partition for grub2 of 1 mb in size. Youve got a box of new hardware and you cant wait to assemble everything to build the greatest server ever tm. This is a form of software raid using special drivers, and it is not necessarily faster than true software raid. Ubuntu and many other linux distributions use the grub2 boot loader. In my setup, i have two disks that are each formatted in the following way. The raid software included with current versions of linux and ubuntu is based on the mdadm driver and works very well. Assuming the normal system partitions are on a software raid. Solved installing grub2 with boot on software raid.
I wanted to migrate this installation to a raid1 setup where there were two. How do i install grub on a raid system installation. Now bind the directories that grub needs access to to detect other operating. Super grub2 disk helps you to boot into most any operating system os even if you cannot boot into it by normal means. It is able to convert a single linux system disk in to a software raid 1, 4, 5, 6 or 10 system in a twopass simple command. How to set up software raid1 on a running lvm system incl. If you have 2 x 500 gb hdd then total space become 1 tb. Installationsoftwareraid community help wiki ubuntu. Ubuntu raid 1 step 7 repeat steps for second drive. Solved cant install grub2 on software raid found the problem.
I recently switched my home server from windows server 2003 to ubuntu 10. For grub2 to work with raid1, you must leave a 1mib space between the mbr and the start of the first partition. Administrators have great flexibility in coordinating their individual storage devices and creating logical storage devices that have greater performance or redundancy characteristics. Raid is a method of using multiple hard drives to act as one. 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. Ran and read grub2mkconfig along with grubprobeverbose and. I would think the correct partition to install grub2 on would be md0, but it fails to install, there. Everything installs fine until i get to the boot loaders. How to set up software raid1 on a running system incl. Ubuntus installer currently supports installation to software raid1 targets for boot and. How do you ensure grub is properly installed on a software raid array in ubuntu. Use super grub2 disk whenever you cannot boot into any of your systems.
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