When typical stuff like grubinstall from a rescue console doesnt work. This guide should work equally well for the clones of rhel, e. Using your centos install media, boot in to rescue mode. I will commence by saying that, while ive done a fair bit of linuxing, i have no experience whatsoever with raid and id be grateful for any input. When asked to install bootloader, install to first device.
During the grub rescue an ls shows the member disks and also shows md0 but if i try an ls. Im trying to setup and install ubuntu on a raid 1 setup. You can not install grub on an mdadm device, it exists by virtue of the raid software, i. Replaced sata controller, software raid mdadm stopped. If the kernel panics because it can not mount the root drive, then the cause is almost certainly that your kernel is missing the mddegradedboot patch see section 4. I basically used it as a sata controller, rather than a raid controller. Problem is i have no idea how to change from raid to sata in grub rescue prompt. Software raid grub boot error on new xubuntu installation. To rewrite the partition table when you reboot, you can stuck with this grub rescue prompt. Its is a tool for creating, managing, and monitoring raid devices using. Now that you have a grub rescue prompt you should be able to go back to rescue mode, get to the point where you can install grub again to the mbr of sda and you should be.
Im thinking that i need to mount the root partition in rescue mode somehow and updatefix the raid config files, however have no idea how to go about this. If there was an update that made your system nonbootable and they have fixed it in the repositories, you can use the live cd to run aptget to get the new files to fix your system. Changed bug title to grub boot on large software raid systems may break due to bios limitations from grub2. If you search for software raid grub youll find a number of web pages that more or less get you there with what you need to know. How to set up software raid1 on a running system incl. I would still love to find out what i should do differently to. Not to be confused with the linux kernels software raid feature multidisk device. When the bootloaderstep is entered i selected grub2 each time i.
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. This is a form of software raid using special drivers, and it is not necessarily faster than true software raid. Everything went fine with the install but as soon as i rebooted im. Insert centos mediadvd and boot in rescue mode select rescue mode during boot. By following the steps, you may able to do system recovery or disk operation. Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. How do i install grub on a raid system installation. Browse other questions tagged linux grub2 softwareraid xfs or ask. I cant help with installing grub now but what i did to get my raid running is i followed this instruction.
It can be used as a replacement for the raidtools, or as a supplement. This article describes how to setup a linux system that can boot directly from a software raid1 device using grub. From the linux boot menu, select rescue a broken system. Once booted into the os, i mounted my boot partition and reinstalled grub2. Installing grub2 with boot on software raid gnu mailing lists. Replaced sata controller, software raid mdadm stopped booting. Whether you want to recover access to your unbootable gnulinux or you have forgotten your windows password rescatux is for you. I was able to setup a software mdadm raid on this system instead. The red hat customer portal delivers the knowledge, expertise, and guidance available through your red hat subscription. Use super grub2 disk whenever you cannot boot into any of your systems. Linux software raid and grub recovering from a failure.
This article addresses an approach for setting up of software mdraid raid1 at install time on systems without a true hardware raid controller. I have installed ubuntu, debian and centos dozens of times, and each time i get sent to a grub shell not rescue. I read that i could reinstall freenas, and recreate the same type of raid volume with the same name, and it would pick it up. Im not aware of support in grub to declare two disks as being in a raid1 array. So, during the install i noticed an option to do software raid and choose that route. I had to boot from the rescue cd, get the raid partition assembled, mount it, and chroot into the mount point of the raid. This article is how to activate lvm and mdadm software raid in rescue and reinstall grub boot loader, since the boot cd will not do this job for you.
Hi, i was reloading my linux box from scratch recently and decided to try software raid 0 since i have two identical 75gb drives and figured this would provide a nice boost in readwrite speeds. Each of the two physical drives is partitioned as follows. If you have a devsda hard drive failure, you would have to boot using the rescue and comment out the hd0,0 line and uncomment the hd1,0 line. Then it allows you to choose partitions of each disk device to add to md. With bios set to raid mode vs ahci, you need to actually configure raid on your controller presumably the one built into your motherboard. Hi, i was reloading my linux box from scratch last night and decided to try software raid 0 since i have two identical 75gb drives and figured this would provide a nice boost in readwrite speeds. When a main drive fails, a reserve is automagically brought in thanks to the md daemon.
Im posting here for the first time, though reading this site. Its is a tool for creating, managing, and monitoring raid devices using the md driver. If you are interested in minitool partition wizard bootable edition, you can purchase its professional edition to create a bootable disc to boot your computer and. Here there is a little video tour in order to discover most of super grub2 disk options. At this point the raid module built into the kernel will try to assemble your raid1 array using a nonexistant drive and your secondary, or mirror, drive. I created a raid container with 2 x 1tb discs then a raid 1 volume inside the container with lvm on top of that. Now that you have a grub rescue prompt you should be able to go back to rescue mode, get to the point where you can install grub again to the mbr of sda and you should be off to the. This article refers to the use of the old grub now known also as grublegacy. Even if one of the disks in the raid array fails, the system can still boot. This is the preferable and more reliable method to establish software raid arrays. R410 w software raid always boots to grub shell after. Ideally, all three partitions would be setup with a raid 10 to ensure if one drive fails, say sda, the machine can still boot without issues, and the raid can rebuild the boot partition on a replacement drive. Discover all the available rescue options to take in control your machine again. I created two 100mb software raid primary paritions, one on each disk, two.
The pos describes a way to assemble a software raid in rescue mode. Once you are booted in to rescue mode, select the start shell option. Redhat enterprise 3 doesnt contain a good guide on how to install and manage a rhel3 system to a pair of mirrored disks using software raid. Software raid red hat enterprise linux 6 red hat customer portal. I have an r410 with a sas6ir no dedicated raid card, 4x3tb drives, and it came preinstalled with windows. Solved error no such partition grub rescue in windows 10. Im thinking a fsck on the boot volume may work, but grub rescue doesnt help me much there, is there another shell to access maybe. In my experience, the installation will complete without any errors, but upon boot you will get to a grubrescue prompt. Please scan before addressing my specific queries will likely save. Browse other questions tagged linux grub2 software raid xfs or ask. Insert centos mediadvd and boot in rescue mode select. To install this on the second disk devhdc, we need to run grub.
Some times if you have dual boot system and you delete any partition contains win 7. Since raid hardware is very expensive, many motherboard manufacturers use multichannel controllers with special bios features to perform raid. It gives some further details about grub rescue situations toward the end of the article that will probably apply to you. However, after system reboot i was returned to the same rescue grub shell with unknown. If youve just installed centos 6 on software raid and it wont boot off devmd0, try the following. The rest of the options you will have to discover them by yourself. Error unknown filesystem grub rescue mode fix youtube. If playback doesnt begin shortly, try restarting your device. Hi im having trouble with grubinstall on an imsm now called irst raid system on an intel dq77mk motherboard. There is a software raid option in the manual disk setup wizard. I had a look on the net and ive found out that it is a problem with software raid and grub, they dont like each other apparently. Grub rescue, will not boot from mdadm raid, no such disk or device mduuid wrong. By default it tries my first disk, which gives a fatal error.
1072 1160 349 1012 919 825 1212 908 390 834 1023 1067 1391 859 262 549 651 1306 309 824 683 280 106 886 304 149 682 1199 616 384 1455 1173 1146 1457