Grub boot loader software raid 1

Mar 20, 2011 if you run a system on software raid 1, then you also need to manually duplicate the grub bootloader on both disks. I made a raid 1 of two raw disks, devsda and devsdb, not devsdax devsdbx. Then i installed centos 7 on the raid, with boot, and swap being partitions on the raid. Dear, we are trying to install a new xenserver 7 on a dedicated server. Safely boot multiple windows and linux systems on both gpt and mbr disks.

In case your next hdd wont boot then simply install grub to another drive. The bootloader should be grub2 because the bios is known to have issues with grub legacy. The source for these parameters is the bootgrubmenu. How to rescue, repair and reinstall grub boot loader in ubuntu. This is described in the section installing the bootloader.

After repeating that for all raid debian jessie testserver gigabyte f2a88xnwifi and amd a107860k. Mar 06, 2015 this page details the procedures for installing and reinstalling grub 2. If you run a system on software raid 1, then you also need to manually duplicate the grub bootloader on both disks. That first partition is a 1mb bios boot partition which is where grub will write its boot loader. Be aware that grub will not complain and no errors will be. When using grub with windows grub gets up to the second stage boot loader. A mbr bootloader cant direct the system to another disk, only to the. In the event of a failure you can boot fine off the second disk because it has an identical copy of the original boot partition.

Make sure that your grub configuration doesnt hardcode disks like hd0, but instead searches for the boot and root filesystems uuids. The red hat customer portal delivers the knowledge, expertise, and guidance available through your red hat subscription. Ubuntu server wont boot after clean install with software. The proccmdline shows the kernel command line configured at boot time. Even if one of the disks in the raid array fails, the system can still boot. How do i install grub on a raid system installation. I want to use grub2 as boot loader, but i read that is needed to be created a bios boot partition. The problem is, the grub bootloader doesnt know about the software raid, so it only installs the bootloader on the first drive. For more information on a variety of grub 2 topics, please visit the grub2 main page. You need to either use a real hardware raid controller or use software raid 1. Then i configured grub to also look on the seccond disk in case of malfunction. Firmware raid has one advantage over software raid in that it assembles the volumes before boot, which allows the bootloader to reside on raid and means you dont have to deal with physical discs from inside the os though you can. How to set up software raid1 on a running system incl. Hi, when i used autoyast with software raid 1 partition, i installed the grub bootloader on mbr.

My problem is that grub2 install absolutely and resolutely refuses to install on devsda or devsdb. Im trying to setup and install ubuntu on a raid 1 setup. Do this even for arrays that you are not going to boot from. Its look like that the only procedure public, on that matters is described on that thread. Grub boot loader on debian 9 by palmstroem 20171017 15. Software raid red hat enterprise linux 6 red hat customer portal. As boot loader, grub in this case, does not know anything about software raid that is managed by kernel, it needs to be installed on both devices on that software mirror.

This should be your problem root hd1,0 filesystem type is ext2fs, partition type 0x83. How to install bootloader on both disks with software raid 1. If the kernel panics because it can not mount the root drive, then the cause is almost certainly that your kernel is missing the mddegraded boot patch see section 4. You tagged softwareraid, so learning grub can help. Grab a copy of boot sector explorer bse, and use it to write the zero file 512 bytes of 0x00 to the new disk. If boot is on a primary partition, it can be installed to the boot sector of one or both drives.

The information applies to most versions of grub 2, but is specifically written for version 1. Proceed through the installer until you get to filesystem. This article describes how to setup a linux system that can boot directly from a software raid 1 device using grub. The screen will prompt you to write changes to disks. The boot directory cannot be striped across multiple disks, as in a level 0 raid. Grub vs grub2 bootloader learn the main difference.

It still does not boot from the software raid 1, but from one of the raid. Now we have to set up the boot loader to boot to the raid drive. Solved grubinstall on imsm raid thank you both and to lilsirecho for your replies. Solved installing grub2 with boot on software raid.

Using your centos install media, boot in to rescue mode. Installing grub on both drives of a software raid1. All modules are digitally signed for your security. Software raid 1 setup on centos using grub boot loader. Install ubuntu with software raid mdadm for the installation, im using the live server installer for ubuntu server 18. Hello all, i am trying to setup a raid 1 on my system that has 2 identical ide hard disks. You may not be required to do so, but proceed at your own risk.

After first boot, consider executing dpkgreconfigure grub pc or dpkgreconfigure grub efiamd64 on efi systems, and install to all devices. Setting up a bootable multidevice raid 1 using linux. The value in this case is to see that the root parameter is pointing to the mirrored raid array. Hi all, im a bit stuck on a new installation where i want to have 2 disks in software raid. To use a level 0 raid on your system, place boot on a separate partition outside the raid. Instead of using the grub shell, i used grub install to install the boot loader on the hard drives. 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. Grub cannot load a kernel from raid because the raid is in the kernel that it has not yet loaded. How to set up software raid 1 on a running system incl grub. Ive just finished setting up gentoo with raid 1 on the boot partition, but because raid is setup before the installation occurs, grub sees one device, and linux raid installs the bootloader to. The steps described in the section restoring data on a new disk do not install a boot loader i. The grub 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. Home how to set up software raid1 on a running system incl.

I made the two 100mb partitions a single raid 1 device, mounted on boot, and the other two a raid 1 device mounted on. Create a raid1 mirroring array and install ubuntu 18. Cannot install grub to raid1 md0 ask question asked 7 years. But only if that raid device is a raid 1 or mirror. In order to boot properly during the raid setup, we will need to create a temporary grub config file. The reason for this post is i havent been able to find a guide for using mdadm in the ubuntu live server installer to create a raid1 partition. Centos 6 wont bootload grub on software raid devmd0. Finally, the boot loader should be installed on the new disk. On debian this is called a reserved bios boot area. Reinstall grub devmd0 may be different for you depending on how you configured your software raid grub install devmd0. Convert a single drive system to raid arch wiki arch linux. My question is will installer, grub2 and squeeze handle synchronization of.

I wasnt satisfied and still wanted to find a way to get it working straight out of the box after a fresh install without needing to perform extra steps afterwards. There are several boot loaders we can install together with linux on our systems and in this article, we shall briefly talk about a handful of the best linux boot loaders to work with. After having added both disks to the arrays, it was time to update the initrd again. Nov 17, 2012 grub vs grub2 bootloader learn the main difference november 17, 2012 updated january 26, 2020 by bobbin zachariah booting, linux howto in this tutorial, i am going to provide some understanding of linux boot loader grub grand unified boot loader. If the system partitions are on a software raid install grub 2 on all disks in the raid.

After you power on an x86 based system, the basic inputoutput system bios initializes the cpu, the memory, and the platform hardware. Once you are booted in to rescue mode, select the start shell option. When asked to install bootloader, install to first device. If your server is located in a remote area, the best practice may be to configure this to occur. Supports both 64 and 32 bit efi firmware as well as bios. For example, root hd0, 1 specifies the first detected disk and the second partition on that disk. Feb 27, 2020 i have created a raid 1 for the swap partitions, and raid 10 for. Gnu grub short for gnu grand unified bootloader, commonly referred to as grub is a boot loader package from the gnu project.

If the default hdd fails then raid will ask you to boot from a degraded disk. If the two disks are devsda and devsdb, run both grubinstall devsda and grubinstall devsdb. Installationsoftwareraid community help wiki ubuntu. Specifies the root partition, which can be on a local disk or on a sanattached disk. But for software raid systems there is currently no support for putting the esp on two separate disks in raid.

Once the configuration installation options are provides, the installation of the system starts. If grub and the kernel that is, boot reside in a linux software raid 1 array, grub can be installed to the mbr of either or both drives. When the machine reboots back into rhel, it will have working software raid, however the boot. What im not sure of is if i need to go through and install the grub boot loader onto the rest of the hard drives, or.

Gnu grub is a popular and probably the most used multiboot linux boot loader available, based on the original grub grand unified bootlader which. Actually we have two disk on that server, so we need to configure him on raid 1. That means that grub cannot run off a software raid 0. Therefore, the boot directory must reside on a single, specific disk partition.

Jun 24, 2005 at this point the raid module built into the kernel will try to assemble your raid 1 array using a nonexistant drive and your secondary, or mirror, drive. In testing i have found that it is important to reboot using the installation cd. When the machine reboots back into rhel, it will have working software raid, however the boot loader will only be installed on the first disk devhda. The problem is at the end of the installation, it tries to install grub. The reason is that mdadm is not available when grub starts.

Thats the basics of multibooting of dual booting with linux and windows using grub. There are tutorials online for manually taking some steps to install the grub boot loader to each drive, some that talk about creating a bios grub partition, etc. Installing sles on software raid1 suse communities. The boot loader is the first software program that runs after you power on a system. Centos 6 grub on software raid upgrade boot loader configuration. Scroll up in the partition disks menu and select configure software raid. Install ubuntu on a software raid array esecuredata inc. It does not have to be anywhere specific on the drive anymore. Linux software raid or md raid can be used as a boot device. The installation completed, and when the system rebooted, the os didnt come up.

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 second partition is my physical raid volume which contains the lvm phyical volume for all my rootbootvarhomeswap volumes. Grub is the reference implementation of the free software foundations multiboot specification, which provides a user the choice to boot one of multiple operating systems installed on a computer or select a specific kernel configuration available on a particular. Apr 19, 2018 uefi should be able to boot whatever disk hasnt failed, and grubinstall will write to the raid mounted at bootefi. Grub isnt actually using it as raid 1 when booting i. I have created a raid 1 for the swap partitions, and raid 10 for. It sounds like the problem here is setting up raid1 after the centos install has completed. When the initialization phase has completed, the bios loads the boot loader from the configured boot device, and then transfers control of the system to the boot loader. If specified, you must enter the correct grub password to boot the specified kernel or operating system. If none of the more specific forums is the right place to ask.

For this you will need to know what your kernel version is. Windows will not install its bootloader onto the disk if it finds old grub installations or other random data on there. The mapping between biosdetected disks and device files is stored in boot grub device. What im not sure of is if i need to go through and install the grub boot loader onto the rest of the hard drives, or if this configuration sans efi wont work. How to set up software raid 1 on a running system incl. During the install, make sure grub is installed to the mbrgpt of the primary disk. Following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards.

If you plan to store boot on this device please ensure that your bootloader understands mdv1. Cannot install grub to raid1 md0 ask question asked 7 years, 5 months ago. Afterwards we must install the grub bootloader on the second hard drive devsdb. In my testing, lilo absolutely refused to be installed on a raid 1 array. Part ii understanding installations that relate to grub. Reinstall grub devmd0 may be different for you depending on how you configured your software raid grubinstall devmd0. The easiest method i found was to use a usb drive to host the bootloader. Assuming its raid 1, then scroll down to select raid 1. Trying to install ubuntu server on a hardware raid 1 array instead of the native linux software raid. Debian user forums view topic grub boot loader on debian 9. By default it tries my first disk, which gives a fatal error. If you have 2 x 500 gb hdd then total space become 1 tb. Recovering from windows software raid failure web and.