Some software on nonlinux operating systems also used this embedded area and broke the system by overwriting the grub 2 information on dualboot systems. Raid stands for r edundant a rray of i nexpensive d isks. I have been setting up a two machines with software raid to use as xen virtual environments. 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. When the root file system is located on a software raid, an initramfs is necessary for automatic assembly. Software raid for root file system boot using grub 2. Raid allows you to turn multiple physical hard drives into a single logical hard drive. Install ubuntu with software raid mdadm for the installation, im using the live server installer for ubuntu server 18. To add a new entry into the win7 boot manager, you can use the official bcdedit command or the unofficial graphical utility named easybcd 2. 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. Solved installing grub2 with boot on software raid hi all, im a bit stuck on a new installation where i want to have 2 disks in software raid.
Solved installing grub2 with boot on software raid hi all, im a bit stuck on a new installation where i. I have a brand new installation that im trying to install grub2 onto 6 disks, in a linux software raid 5 array. The red hat customer portal delivers the knowledge, expertise, and guidance available through your red hat subscription. This guide explains how to set up software raid1 on an already running ubuntu 10. Whilst the new code handling the raid io still runs in the kernel, devicemapper is generally. So if you do not have a remove kvm type system connected to your.
We can use it not only for software raid 5 but pretty much for any level of raid, simple or nested. Ideally with raid 1, raid 5, etc once can easily do a hot hdd swap as they support mirroring at the hardware level but to do the same on a software raid 1 becomes tricky as ideally an os shutdown is needed to avoid any application impact during the hdd swap. May 26, 2017 ideally with raid 1, raid 5, etc once can easily do a hot hdd swap as they support mirroring at the hardware level but to do the same on a software raid 1 becomes tricky as ideally an os shutdown is needed to avoid any application impact during the hdd swap. Linux software raid howto with grub bootloader junjis. How do i install grub on a raid system installation. We can use full disks, or we can use same sized partitions on different sized drives. 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. How to set up software raid 1 on a running system incl. Sep 23, 2011 whether you use a version of grub 2 thats configured to look for its support files on the esp or on a linux partition, the software can load the linux kernel from just about anywherethe esp, a linux partition, or even from a raid or lvm partition. Software raid on linux with mdadm in linux magazine. Whether you use a version of grub 2 thats configured to look for its support files on the esp or on a linux partition, the software can load the linux kernel from just about anywherethe esp, a linux partition, or even from a raid or lvm partition. We just need to remember that the smallest of the hdds or partitions dictates the arrays capacity.
Install ubuntu on raid 0 and uefigpt system github. This means youll need to run grubinstall again if you replace one disk. In the following image there are 6 hard disks, the first two disks are the same size and we will install the operating system on them using software raid 1. Thats it, we have created raid 10 using method 1, this method is the easier one. Jul 11, 2010 i have been setting up a two machines with software raid to use as xen virtual environments. 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. R410 w software raid always boots to grub shell after. Reads nf and then passes the button to the windows boot loader.
Grub dont support booting on a raid10 software raid. In disk management is disk 2, we will remember number 2 here. Because my system wouldnt boot from boot i guess the bios didnt support it i had to install grub on the mbr. If the installation allows it, you must select both sda and sdb for the installation of grub2. 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 linux distribution. How to set up software raid 1 on an existing linux distribution. Grub 2 now can recognize this potential problem and avoid it. A real scenario just needs to provide a raid 1 devmd0 that can be of any size provided it is enough hold the linux installation and composed of any software raid 1 partitions each partition in the array should reside on a different physical disk, possibly connect to different ide channels, to achieve maximum fault tolerance. Cannot install grub to raid1 md0 ask question asked 7 years.
Mar 26, 2020 in this tutorial, well be talking about raid, specifically we will set up software raid 1 on a running linux distribution. The state of the active linux software raid devices can be viewed by running. Linux handles raid and syncs the two boot partitions. In my testing, lilo absolutely refused to be installed on a raid1 array. 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. Setting up a bootable multidevice raid 1 using linux. There are many raid levels such as raid 0, raid 1, raid 5, raid 10 etc. Run command prompt under admin and go to the grub2.
How to perform disk replacement software raid 1 in linux. The best way to use two or more disks for swap as in this situation is to set both partitions to the type swap then in. Linux raid autodetect devsda3 8652800 8914943 1072 fd linux raid autodetect sda1 and. Oct 26, 2017 an easy solution is to install grub on the linux partition not the mbr. Now lets move forward to setup raid 10 using method 2. As you can see, devsdb drive is blank, however, it does not have to be. In my setup, i have two disks that are each formatted in the following way. 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.
When using grub with windows grub gets up to the second stage boot loader. In order to boot properly during the raid setup, we will need to create a temporary grub config file. In method 2, we have to define 2 sets of raid 1 and then we need to define a raid 0 using those created raid 1 sets. If the system partitions are on a software raid install grub 2 on all disks in the raid. R410 w software raid always boots to grub shell after linux. 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. Raid contains a group or a set of arrays set of disks. For this you will need to know what your kernel version is. This will be helpful when one hdd fails theres still a working grub.
It does not automatically install itself on both drives. Using the entire drive erase disk and install ubuntu. An easy solution is to install grub on the linux partition not the mbr. However, the mdadm tool is a single that is much more powerful. Having seen our plain and simple install of ubuntu 12. Select the first hard disk labeled scsi33 0,0,0 sda and then press enter. May 15, 2007 show a sda52 with the 2 denoting that it is a spare drive waiting to build. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with. 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. A real scenario just needs to provide a raid1 devmd0 that can be of any size provided it is enough hold the linux installation and composed of any software raid1 partitions each partition in the array should reside on a different physical disk, possibly connect to different ide channels, to achieve maximum fault tolerance. 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.
If the installation does not allow it, then install grub2 on sda and after the installation of squeeze is completed and you reboot, install grub2 on sdb. If youre using grub that isnt grub2, just ignore the fact that youre using raid at all. 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.
Installing grub2 with boot on software raid gnu mailing lists. Mar 06, 2015 if the system partitions are on a software raid install grub 2 on all disks in the raid. Installing grub2 on gnulinux software raid sinodun. Jun 24, 2005 most users who are familiar with linux software raid are also familiar with raidtools. Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. If youve put a new drive in, dont forget to do the grub commands above to place grub in the mbr of the drive so that you can boot to it later if necessary. How to create a software raid 5 in linux mint ubuntu. Installing grub2 on ubuntu with software raid mirroring server fault. Install grub2 on usb and hdd from windows aio boot. This doesnt sound like a highend or traffic server to me, so the performance penalty probably wont be that hard. 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. That adds a lot of overhead that slows down raid and you dont need the redundancy on swap. Mar 17, 20 having seen our plain and simple install of ubuntu 12. Most users who are familiar with linux software raid are also familiar with raidtools.
Software raid red hat enterprise linux 6 red hat customer portal. If the system partitions are on a software raid install grub 2 on all disks in the. Proceed through the installer until you get to filesystem. Installing grub2 on mdadm software raid in debian wheezyjessie. A combination of drives makes a group of disks to form a raid array or a set of raid which can be a minimum of 2 disks connected to a raid controller and making a logical volume or more, it can be a combination of more drives in a group. Jun 26, 2017 run command prompt under admin and go to the grub 2. When the bootloaderstep is entered i selected grub2 each time i loaded a new raid install. We cover how to start, stop, or remove raid arrays, how to find information about both the raid device and the underlying storage components, and how to adjust the. Setting up raid on an existing debianubuntu installation.
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 grub2 install devsda. Installing sles on software raid1 suse communities. How to set up software raid 1 on a running system incl grub. How to set up software raid1 on a running system incl. After installing the mdadm tool, grub2 can correctly read the raid devices. Gentoo linux x86 with software raid and lvm2 quick install guide. Software raid in linux is implemented by the multiple devices md driver. I cant help with installing grub now but what i did to get my raid running is i followed this instruction. Check the number of hard disk you will install, be it usb or hdd. Now we need to make a note of the raid array device on which your linux partition exists.
Apr 28, 2017 how to create a software raid 5 on linux. If it does not come with raid10 support then boot must be on its own regular partition that can be accessed without first assembling raid. For the first word, tab lists possible command completions. Speed up linux software raid building and resyncing. Following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards. Grub2installing community help wiki ubuntu documentation. Thats the basics of multibooting of dual booting with linux and windows using grub. Install grub 2 on a fake raid system techspot forums. Home how to set up software raid1 on a running system incl. Installing grub2 on gnulinux software raid sinodun internet.
Congratulations you have now installed, worked with, and restored software raid in linux. Grub only has limited filesystem support built into itself. I am attempting to install debian using the software raid raid 1. Grub configuration debian etch page 2 dont let creepy ads follow you around. Grub 2 normally writes its bootloader information to an area just beyond the master boot record and before the first partition. Use ipvanish to regain control of your data and break free from online tracking. Linux software raid disc replacement procedure web and. And then yes, you install grubs bootloader on all your drives so the server can boot from any of them. Assuming this is a bios booting computer and not efi, and that you partition each individual disk and create a raid type partition and use those partitions to build the raid array, then you install grub to each of the individual disks in the array so that any one of them can boot the system using any n1 disks that are still present to access the array.
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