If youve just installed centos 6 on software raid and it wont boot off devmd0, try the following. Linux software raid and grub recovering from a failure. With bios set to raid mode vs ahci, you need to actually configure raid on your controller presumably the one built into your motherboard. Insert centos mediadvd and boot in rescue mode select rescue mode during boot. This is the preferable and more reliable method to establish software raid arrays. I basically used it as a sata controller, rather than a raid controller. Discover all the available rescue options to take in control your machine again. Hi im having trouble with grubinstall on an imsm now called irst raid system on an intel dq77mk motherboard. Playing around on my labrat i realized that sometimes elcentos 6.
In my experience, the installation will complete without any errors, but upon boot you will get to a grubrescue prompt. Use super grub2 disk whenever you cannot boot into any of your systems. The problem is at the end of the installation, it tries to install grub. Once booted into the os, i mounted my boot partition and reinstalled grub2. 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. I had to boot from the rescue cd, get the raid partition assembled, mount it, and chroot into the mount point of the raid. Here there is a little video tour in order to discover most of super grub2 disk options.
Even if one of the disks in the raid array fails, the system can still boot. This is a form of software raid using special drivers, and it is not necessarily faster than true software raid. Error unknown filesystem grub rescue mode fix youtube. 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. Then it allows you to choose partitions of each disk device to add to md. I would still love to find out what i should do differently to. Problem is i have no idea how to change from raid to sata in grub rescue prompt.
If playback doesnt begin shortly, try restarting your device. It gives some further details about grub rescue situations toward the end of the article that will probably apply to you. The rest of the options you will have to discover them by yourself. 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. Not to be confused with the linux kernels software raid feature multidisk device. 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. 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. Our backup machine still using red hat 9 uses a raid. Is there any easy way to get this up and running and still retain my data. By default it tries my first disk, which gives a fatal error.
This article refers to the use of the old grub now known also as grublegacy. This article describes how to setup a linux system that can boot directly from a software raid1 device using grub. During the grub rescue an ls shows the member disks and also shows md0 but if i try an ls. Software raid grub boot error on new xubuntu installation. How do i install grub on a raid system installation. Solved cant install grub2 on software raid my several installs of raid0 utilized grub 2 with no problems. 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. From the linux boot menu, select rescue a broken system. So, during the install i noticed an option to do software raid and choose that route. Solved error no such partition grub rescue in windows 10.
Please scan before addressing my specific queries will likely save. Im not aware of support in grub to declare two disks as being in a raid1 array. Grub rescue, will not boot from mdadm raid, no such disk or device mduuid wrong. When the bootloaderstep is entered i selected grub2 each time i. R410 w software raid always boots to grub shell after. 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. Whether you want to recover access to your unbootable gnulinux or you have forgotten your windows password rescatux is for you. I created two 100mb software raid primary paritions, one on each disk, two.
I have an r410 with a sas6ir no dedicated raid card, 4x3tb drives, and it came preinstalled with windows. 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. It can be used as a replacement for the raidtools, or as a supplement. I was able to setup a software mdadm raid on this system instead. Insert centos mediadvd and boot in rescue mode select. Browse other questions tagged linux grub2 software raid xfs or ask. 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. Everything went fine with the install but as soon as i rebooted im. 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.
I cant help with installing grub now but what i did to get my raid running is i followed this instruction. 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. To install this on the second disk devhdc, we need to run grub. When typical stuff like grubinstall from a rescue console doesnt work. Since raid hardware is very expensive, many motherboard manufacturers use multichannel controllers with special bios features to perform raid. This guide should work equally well for the clones of rhel, e. Grub rescue, will not boot from mdadm raid, no such disk or device.
To rewrite the partition table when you reboot, you can stuck with this grub rescue prompt. Replaced sata controller, software raid mdadm stopped booting. However, after system reboot i was returned to the same rescue grub shell with unknown. Browse other questions tagged linux grub2 softwareraid xfs or ask. Once you are booted in to rescue mode, select the start shell option. Installing grub2 with boot on software raid gnu mailing lists. Its is a tool for creating, managing, and monitoring raid devices using the md driver. Changed bug title to grub boot on large software raid systems may break due to bios limitations from grub2. 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. There is a software raid option in the manual disk setup wizard.
The red hat customer portal delivers the knowledge, expertise, and guidance available through your red hat subscription. Each of the two physical drives is partitioned as follows. I created a raid container with 2 x 1tb discs then a raid 1 volume inside the container with lvm on top of that. 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. Some times if you have dual boot system and you delete any partition contains win 7. When a main drive fails, a reserve is automagically brought in thanks to the md daemon. Software raid red hat enterprise linux 6 red hat customer portal. You can not install grub on an mdadm device, it exists by virtue of the raid software, i.
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. I have installed ubuntu, debian and centos dozens of times, and each time i get sent to a grub shell not rescue. When asked to install bootloader, install to first device. 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. The pos describes a way to assemble a software raid in rescue mode. Its is a tool for creating, managing, and monitoring raid devices using. Im posting here for the first time, though reading this site. Using your centos install media, boot in to rescue mode. How to set up software raid1 on a running system incl. 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. 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.
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