Raid5 is similar to raid1, but it uses three devices and provides the space of two of them. I would think the correct partition to install grub2 on would be md0, but it fails to install, there. Booting anaconda from software raid1 device posted on may 5, 20 sometimes you just want to boot anaconda from a software raid device that houses both the stage1 initrd. I hope to address those here and provide an endtoend guide for myself and others wishing to do similar activities. Its all been running great but the power went out for a minute and when the box came around the raid is gone. With a pc bios, hd0 is the disk that the bios reads the boot sector from its the disk that contains the boot sector, and hd1 is some other disk you dont always get to choose. There was a previous task t289 mentioning a similar problem but this was a higher layer issue, not grub itself grub replys by. This is the documentation of gnu grub, the grand unified bootloader, a flexible and powerful boot loader program for a wide range of architectures. Install the grub boot loader to the master boot record. Is there a way to boot from a software raid 5 array. Hi all, it took me some time, but i got back to the point before the doublefree corruption. 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. The size of a raid 1 array block device is the size of the smallest component partition.
Does grub2 really support putting boot on a software raid5 partition. Please note that with a software implementation, the raid 1 level is the only option for the boot partition, because bootloaders reading the boot partition do not understand raid, but a raid 1 component partition can be read as a normal partition. This breaks grub2, and making the mistake of trying to run grub2 install on top of these errors will break grub boot altogether. Hi all, i recently setup a raid 5 setup with 8 4tb drives with mdadm. 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. Grub and the boot process on biosbased x86 systems. Jul 11, 2010 i have been setting up a two machines with software raid to use as xen virtual environments. 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 gnulinux distribution. Jun 02, 2016 hi, have struggled with this for a day, too and found a soultion. Im trying now to install gentoo on a new machine using raid 1 boot and root in a single partition and raid 0 home.
As far as i understand the guide gentoo linux x86 with software raid and lvm2 quick install guide does not use grub2 and i think i do not need lvm2. My problem is that grub2 install absolutely and resolutely refuses to install on devsda or devsdb. Start the f16 rc5 netinstall cd and set the partitions as software raid 6. When the bootloaderstep is entered i selected grub2 each time i loaded a new raid install. If it is not in the man pages or the howtos this is the place. How to reinstall grub2 efi bootloader on ubuntu published by shyam jos on august 23, 2017 august 23, 2017. Volgroup00, this is the volume group and md1 is the only pv in it.
It looks like the uefi thinktank completely sidestepped the issue of esp redundancy and left it all to the hardware vendors. Nov 12, 2014 12 create a new partition 500m for boot and change type to raid 1 at this point one of the bios boot partitions should have appeared in the main list of partitions create a new lvm swap partition to desired size click manage and make it raid1. Again, the only way to get it to boot is to change the bios boot to the second drive which has the original nonraid boot setup. In this example, we use virtual machine qemu or kvm. Solved installing grub2 with boot on software raid. Xenserver 7 raid1 mdadm after install running system. Installing grub2 with boot on software raid, jordan uggla, 20701. An ideal answer would link to a tutorial that explains how to move a boot. After having added both disks to the arrays, it was time to update the initrd again. Replacing faulted drive on linux software raid mdtools, you already know how to swap a faulty drive with a new one, but what happens if you need to substitute primary disk where your computer makes boot.
In gdisk, set both 256 meg gpt partitions for type fd00 5. Grub2 configuration debian squeeze this guide explains how to set up software raid1 on a. For this you will need to know what your kernel version is. I created a raid container with 2 x 1tb discs then a raid 1 volume inside the container with lvm on top of that. Install ubuntu with software raid mdadm for the installation, im using the live server installer for ubuntu server 18. Now boot off your fake raid and see grub starting your new debian installation. All partitions should be software raided although with one drive only. Using configure software raid im creating raid 1 devices on pairs of partitions earlier marked as physical volume for raid. Installing grub2 with boot on software raid, wesley pa4wdh, 20706. Apr 28, 2016 well, i do not know how to do it with mdadm, but grub2 can boot from inside luks that is inside another luks that is inside lvm that is inside etc.
Super grub2 disk helps you to boot into most any operating system os even if you cannot boot. In order to boot properly during the raid setup, we will need to create a temporary grub config file. This article addresses an approach for setting up of software mdraid raid1 at install time on systems without a true hardware raid controller. Note that the situation is completely different in grub 1 and grub 2. This page contains some screenshots to demonstrate it, and applies to debian 5. 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 devsda. Then i installed centos 7 on the raid, with boot, and swap being partitions on the raid.
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. I created a boot partition that goes to md0p4, but it wont install there, either. 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. This gives the appearance of a hardware raid, because the raid configuration is done using a bios setup screen, and the operating system can be booted from the raid. Proceed through the installer until you get to filesystem. Ive heard rumors that grub2 is able to support boot on raid0, raid1 or raid 5, metadata 0. Assuming that devmd127p1 is my raid partition yours could be different devsda2 is my efi boot partition which mounts at boot efi normally yours could be different mnt is an empty folder which exists, functioning as our place to build our directory structure for the new system. However, i cant figure out to do a grub setup on a raid 5 array.
Basically, since xenserver 7 is based on centos 7, you should follow the centos 7 raid conversion guide. I am running a 14 disk raid 6 on mdadm behind 2 lsi sas2008s in jbod mode no hw raid on debian 7 in bios legacy mode. Instead of using the grub shell, i used grub install to install the boot loader on the hard drives. Copy everything thats on the existing drive onto the new one using rsync. Installing grub2 with boot on software raid, wesley pa4wdh, 20703. How to install grub2 on gtp with sw raid and lvm ubuntu forums. The first boot option correctly assembles the root raid set at boot time, and boots successfully. After adding a new disk to your raid chain its a good idea to make it bootable as well by installing grub on mbr. I want to place boot on usb and boot raid linux boot usb raid grub. Replace hard disk from software raid experiencing technology. Grub2 is dropping to a rescue shell complaining that no such device exist. How to set up software raid1 on a running lvm system incl. Installing a fresh version of vyos in vmware esxi for testing purposes w raid1 support ended with an installation that cant boot.
I have a brand new installation that im trying to install grub2 onto 6 disks, in a linux software raid 5 array. Following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards. Apr 29, 2019 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. The gentoo wiki has information that discusses both grub 1 and grub 2. So my guess is to create a lvm over multiply disks, then install grub2 over a logical volume. Grub 1 doesnt know anything about raid, but can fake reading from a raid1 device by reading one of the disks this requires a 0. Grub seems to want to deal with physical disks that have a readable boot on them. Software raid for root file system boot using grub 2. Installing grub2 on gnulinux software raid sinodun. An ideal answer would link to a tutorial that explains how to move a. Centos 7 install with uefi boot and software raid1. In uninstalled every program i installed since the first grub2 install, recompiled grub2 and all its dependencies, and now things seem a bit more the way they should be. Jan 25, 2017 i made a raid 1 of two raw disks, devsda and devsdb, not devsdax devsdbx. The filesystems on the raid devices are ext2 voor devmd0 for boot.
Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. Gentoo forums view topic solved installing grub2 with. Solved debian software raid 1 and grub issue user name. The grub2 install devsda and grub2 install devsdb should work as expected on a raid 1 array comprised of devsda2 and devsdb2 for boot. This article describes how to setup a linux system that can boot directly from a software raid 1 device using grub. Solved cant install grub2 on software raid installation. 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.
Grubs boot sector reads the core image at a fixed location on a disk supported by the bios it doesnt have much choice. How to set up software raid1 on a running system incl. Installing grub2 with boot on software raid, wesley pa4wdh, 20705. Super grub2 disk helps you to boot into most any operating system os even if you cannot boot into it by normal means. The gentoo installation docs assume single disk and the grub2 install docs wiki didnt mention installing mdadm first. Troubleshooting alternatives mdadm an alternative for dmraid is mdadm. With the advent of terabyte disk drives, fakeraid is becoming a popular option for entrylevel small business servers to simply mirror 2 1.
Ive heard rumors that grub2 is able to support boot on raid 0, raid 1 or raid 5, metadata 0. Centos 6 wont bootload grub on software raid devmd0 posted by curtis k in administration, centos 6, quick tips dec, 12 2012 1 comment if youve just installed centos 6 on software raid and it wont boot off devmd0, try the following. Installing gentoo with grub2, gpt, luks and software raid. Even if one of the disks in the raid array fails, the system can still boot. I have a linux software raid5 involving four disks mdadm. In this tutorial i will show you how to reinstall grub2 bootloader on a ubuntu system with efi partition. Does grub2 really support putting boot on a software raid1 partition with 1. With the above command in the grub shell you will see the disks containing the file. Even sometimes by pressing esc you can also display the menu. Installing grub2 with boot on software raid gentoo forums. Setting up raid on an existing debianubuntu installation. Debian user forums view topic solved cannot make grub2. How do i install grub on a raid system installation. Hi, have struggled with this for a day, too and found a soultion.
This is normally boot but should be changed if the grub folder is located elsewhere. Once you have completed your partitioning in the main partition disks page select configure software raid select yes select create new md drive select raid type. On the other hand, with raid 5, i dont need a separate boot partition and all drives are equal when it comes to booting. I do not issue any guarantee that this continue reading how to set up software raid1 on a running lvm system incl. Installing grub2 with boot on software raid, andrey borzenkov, 20701. In case your next hdd wont boot then simply install grub to another. Hi im having trouble with grub install on an imsm now called irst raid system on an intel dq77mk motherboard. On systems with a separate boot partition, that partition should be mounted to mntboot. How to set up software raid 1 on a running system incl grub. Installing grub2 with boot on software raid, wesley pa4wdh, 20702. Instead, you should make a small 1mb partition on each disk and raid them together and set it as a grub boot partition im not sure of the actual name. I think i will attempt to add that to the grub2 wiki doc, i cant be the only one using raid and running into this issue on a new install. Install linux mint 17 to mdadm raid array linux mint forums. How to set up software raid 1 on a running system incl.
Attempt to use those partitions as the boot partition in a raid1 array results. I want to place boot on usb and boot raid super user. May 30, 20 installing gentoo with grub2, gpt, luks and software raid mdraidmdadm so for various reasons i wanted to install gentoo utilizing full disk encryption with luks except for boot ofc, mdraid, gpt and grub2. Hi all, im a bit stuck on a new installation where i want to have 2 disks in software raid. Kim uses software raid since it is less expensive than hardware raid, and since it is always available on any ubuntu system with multiple disk devices. Installing grub2 with boot on software raid, continued. Now we have to set up the boot loader to boot to the raid drive. However, i havent seen this issue raised in any recent howtos just on old ones. Im working on a personal project and would like to create software raid 1 with grub on rhel 4. Id previously set up raid 1 on systems and there was no real issue about boot it could be read on one drive or the other. This is important to read when dualbooting systems, or when grub2 needs to be configured to boot iso files. On debian this is called a reserved bios boot area. Linux newbie this linux forum is for members that are new to linux. If you software fail devsda then the bios will continue to use it to boot the system.
To install grub now on the new hard disk, enter the following commands into the grub shell. Grub2 fails to boot, dumps you out to a rescue prompt just as before. Jul 05, 20 installing grub2 with boot on software raid, wesley pa4wdh, 20701. Grub vs grub2 bootloader learn the main difference. The red hat customer portal delivers the knowledge, expertise. Installing gentoo with grub2, gpt, luks and software raid mdraidmdadm so for various reasons i wanted to install gentoo utilizing full disk encryption with luks except for boot ofc, mdraid, gpt and grub2. Sep 12, 2015 once you have completed your partitioning in the main partition disks page select configure software raid select yes select create new md drive select raid type. Gnu grub short for gnu grand unified bootloader, commonly referred to as grub is a boot loader package from the gnu project. When the root file system is located on a software raid, an initramfs is necessary for automatic assembly. If you want to see the menu during boot you need to hold down shift key.
This option is the only choice available if your disk contains no software raid partitions. Software raid5 and lvm with the etch installer posted by elizabethbevilacqua 72. The bootloader should be grub2 because the bios is known to have issues with grub legacy. I spent hours trying to work out not only how to set up a software raid, but also how to do it on a boot. Any attempt to access the root device from user space will fail as if the raid set does not exist. Does grub2 support putting boot on a raid5 partition.
Jun 24, 2005 in many cases hardware raid controllers are either too expensive or simply unavailablef or a particular system. In trying to set this up, ive encountered several pitfalls and complexities. If you absolutely have to do software raid, id suggest keeping boot out of your encryptedlvm partitions. When the bootloaderstep is entered i selected grub2 each time i loaded a new raid. Booting from a raid array is very similar to booting from a lvm logical volume aside from raid specific terminology and syntax of raid partitioned volume. From what ive been reading, it looks like linux cant boot from a software raid 5 array.