Nov 28, 2019 following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards. Then install boot repair in it, either via ppa for ubuntumint, or debs for debian. This is a form of software raid using special drivers, and it is not necessarily faster than true software raid. 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 bios boot partition, because of the gpt disk that was not asked to do it in my vm test on vmware workstation. This guide explains how to set up software raid1 on an already running debian etch system. This article describes how to setup a linux system that can boot directly from a software raid 1 device using grub. I have installed ubuntu, debian and centos dozens of times, and each time i get sent to a grub shell not rescue.
Furthermore, an encrypted root filesystem makes tampering with. This should be the easiest to set up and is recommended unless you want to dual boot linux and windows off a single array. After first boot, consider executing dpkgreconfigure grubpc or. 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. After having added both disks to the arrays, it was time to update the initrd again. Since raid hardware is very expensive, many motherboard manufacturers use multichannel controllers with special bios features to perform raid. How to set up software raid1 on a running system incl. Of course this doesnt give me any redundancy but that was just to check if grub failed because there was only one disk in the raid configuration which usually is a bit odd. I created a small bootable grub partition i chose the partition editors. Reads nf and then passes the button to the windows boot loader. This article describes how to setup a linux system that can boot directly from a software raid1 device using grub. Ubuntu server wont boot after clean install with software. Proceed through the installer until you get to filesystem.
Aug 11, 2016 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 grubinstall command has been updated to install the grub mbr on each disk in a raid providing boot, in a running operating system. The grub bootloader will be configured in such a way that the system will still be able to boot if one of. After first boot, consider executing dpkg reconfigure grubpc or dpkgreconfigure grubefiamd64 on efi. Unlike selectively encrypting nonroot filesystems, an encrypted root filesystem can conceal information such as which programs are installed, the usernames of all user accounts, and common dataleakage vectors such as mlocate and varlog. Apr 21, 2010 the grub install command has been updated to install the grub mbr on each disk in a raid providing boot, in a running operating system. The new disk that you used for the replacement probably used to have a filesystem on it and grubsetup is now confused by the metadata that is probably still in there so, just wipe out everything at the beginning of the disk up to the first partition. When asked to install bootloader, install to first device. And then yes, you install grubs bootloader on all your drives so the server can boot from any of them. Ive tried booting from the livecd to install grub, but i cant chroot into my system because it doesnt seem to recognize that my disk is a linux. Raid, be it software or hardware, does not help you in such case it will simply mirror the changes. In testing i have found that you must install grub in two distinct steps. Is this a limitation of grub2, or of the os installers.
Grub boot loader can be configured dynamically, which means a user has an option to make changes while booting. Im working on a personal project and would like to create software raid1 with grub on rhel 4. On a system with oldschool msdos partition tables and a kernel raid ed or boot, grub isnt installed to md0, its installed directly to each member drive, and each member drive is individually. In trying to set this up, ive encountered several pitfalls and complexities. Grub vs grub2 bootloader learn the main difference. 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. Using your centos install media, boot in to rescue mode. Make sure that your grub configuration doesnt hardcode disks like hd0, but instead searches for the boot and root filesystems uuids.
Grub only has limited filesystem support built into itself. Thats the basics of multibooting of dual booting with linux and windows using grub. Mar 20, 2011 if you software fail devsda then the bios will continue to use it to boot the system. Instead of using the grub shell, i used grubinstall to install the boot loader on the hard drives. You may not be required to do so, but proceed at your own risk. Uefi should be able to boot whatever disk hasnt failed, and grubinstall will write to the raid mounted at bootefi. When using grub with windows grub gets up to the second stage boot loader. I made the two 100mb partitions a single raid 1 device, mounted on boot, and the other two a raid 1 device mounted on. Created raid device devmd0 made up of devsda1 and devsdb1 4. After first boot, consider executing dpkgreconfigure grubpc or dpkgreconfigure grubefiamd64 on efi systems, and install to all devices. Launch boot repair, then click the recommended repair. This is a form of software raid using special drivers, and it is not.
If fine bootgrubstage1 shows something else than 0,0, for example 1,0, then. My understanding is that grub1 doesnt know anything about raid and so cant boot off any kind of raid array. Uefi should be able to boot whatever disk hasnt failed, and grub install will write to the raid mounted at boot efi. Be aware that grub will not complain and no errors will be reported. Therefore, the boot directory must reside on a single, specific disk partition. Jun 24, 2005 grub install bootgrubstage1 hd1 bootgrubstage2 p bootgrubmenu. 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. 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. Centos 6 wont bootload grub on software raid devmd0. 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. Insert centos mediadvd and boot in rescue mode select rescue mode during boot select the start shell option chroot with. After first boot, consider executing dpkgreconfigure grub pc or dpkgreconfigure grub efiamd64 on efi systems, and install to all devices. Once you are booted in to rescue mode, select the start shell option. That adds a lot of overhead that slows down raid and you dont need the redundancy on swap.
Even users can also easily alter the current boot entries, they can add new entries, select multiple kernels or even they can modify initrd. This guide explains how to set up software raid1 on an already running mandriva 2008. Centos 7 install with uefi boot and software raid1. Choose this option to configure a partition for software raid. This is the same dialog that appears when you add a standard partition refer to section 23. I figured out my boot drive which is second partition of. Setting up a bootable multidevice raid 1 using linux software. Even if one of the disks in the raid array fails, the system can still boot. 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. The grub bootloader will be configured in such a way th. I cant boot the server off my rescatux recovery stick, and im further guessing thats because the raid software doesnt recognize it. Implemented lvm on partitions created in step 5 by following instructions. Securing a root filesystem is where dmcrypt excels, feature and performancewise.
I hope to address those here and provide an endtoend guide for myself and others wishing to do similar activities. Cfg to read boot partition on lvm oracle community. In testing i have found that it is important to reboot using the installation cd. If you softwarefail devsda then the bios will continue to use it to boot the system. I have my hardwareowned dedicated server hosted in remote datacenter, running centos release 6. If the two disks are devsda and devsdb, run both grubinstall devsda and grubinstall devsdb. On debian this is called a reserved bios boot area. Software raid for root file system boot using grub 2. Install ubuntu on raid 0 and uefigpt system github. Gentoo forums view topic solved installing grub2 with. This option is the only choice available if your disk contains no software raid partitions. Sep 11, 2019 super grub2 disk helps you to boot into most any operating system os even if you cannot boot into it by normal means. I would like to know whether there is waytool to verify that the grub loader are indeed installed on both drives. How to dual boot windows and linux on a fake raid array.
It was tested with a raid0 array but it should work with all types. The size of a raid 1 array block device is the size of the smallest component partition. How to change boot drive on server with raid 5 software raid. Im working on a personal project and would like to create software raid 1 with grub on rhel 4. 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. Launch bootrepair, then click the recommended repair. R410 w software raid always boots to grub shell after. Then install bootrepair in it, either via ppa for ubuntumint, or debs for debian. For grub2 to work with raid1, you must leave a 1mib space between the mbr and the start of the first partition. When the bootloaderstep is entered i selected grub2 each time i loaded a new raid install. I may try to install and tell the system not to install grub to see if i have better luck booting off of the floppy and then setting up grub. The most important tool for setting up raid is mdadm. Id guess that a very specific grub component on hd0,1 has failed. Cfg file, which can be update during system update.
R410 w software raid always boots to grub shell after linux. Solved cant install grub2 on software raid installation. When i try to switch out of grub rescue using insmod normal i get error. 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. Software raid lets the operating system take care of the raid array. Following this, there are also no guides on installing the grub bootloader to both gpt partitioned devices afterwards. In case your next hdd wont boot then simply install grub to another drive. I decided to remove the bootgrub2g file and again recreate the file, which had no luck for me. Install ubuntu with software raid mdadm for the installation, im using the live server installer for ubuntu server 18. Server has 6 2tb drives with 2 software raids on them md0 raid 1 for system and swap and md1 raid 5 for data. And then yes, you install grub s bootloader on all your drives so the server can boot from any of them. Apr 14, 2020 when i try to switch out of grub rescue using insmod normal i get error.
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 etcfstab, set them with the same priority. During the install, make sure grub is installed to the mbrgpt of the primary disk. This is a guide explaining how to dual boot windows and linux off a single raid array. Enable grub2s pata support to work around bios bugslimitation solarwinds mail assure helps your customers stay in control and protect their inbound and outbound email using collective threat intelligence. I have an r410 with a sas6ir no dedicated raid card, 4x3tb drives, and it came preinstalled with windows. I had installed my server using software raid1, i am referring them by the descriptive namesmd0, md1 and md2.
The boot directory cannot be striped across multiple disks, as in a level 0 raid. In my testing, lilo absolutely refused to be installed on a raid 1 array. Stop at the grub menu and enter the c option, which gives you the grub prompt. Instead of using the grub shell, i used grub install to install the boot loader on the hard drives. When the root file system is located on a software raid, an initramfs is necessary for automatic assembly. My understanding is that grub1 doesnt know anything about raid and so cant boot off any kind of raid array except for raid arrays that look like a non raid array. On a system with oldschool msdos partition tables and a kernel raided or boot, grub isnt installed to md0, its installed directly to each member drive, and each member drive is individually. So, if your sector size is 512b, your first partition must start on sector 2048. How do i install grub on a raid system installation. To use a level 0 raid on your system, place boot on a separate partition outside the raid.
When the machine reboots back into rhel, it will have working software raid, however the boot. Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. 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. Reinstall grub devmd0 may be different for you depending on how you configured your software raid grubinstall devmd0. Super grub2 disk helps you to boot into most any operating system os even if you cannot boot into it by normal means. Apr 19, 2018 uefi should be able to boot whatever disk hasnt failed, and grubinstall will write to the raid mounted at bootefi. Booting with software raid almost always requires a separate boot partition, especially with older versions of grub. I also tried to make the boot raid array an array with more than one partition by adding a second partition which lives on devsda3.
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