This tutorial is for all of us that has done everything by the book with parted and still they receive an error when installing grub2 to the boot sector!
srv@local ~ # grub2-install /dev/sda Installing for i386-pc platform. grub2-install: error: disk `mduuid/613f3f0bb202bf03a5664e17b3d568a0' not found.
The solution is relatively simple:
Boot from a rescue disk and reinstall grub from there!
The problem is that currently loaded kernel remembers the old device, which was deleted, and probably you won’t be able to fresh the metadata in the memory. In fact, if you receive this error when booted in a rescue disc you probably have done some changes on the layout of the disks or the partitions or the RAID devices and you must reboot the machine again and then JUST reinstall the grub.
Such problems could have happened if you deleted partitions or made some disk layout changes (using parted?) on mounted or partitions in use and the kernel could loaded the partition changes in memory. The parted reports the changes will take effect after system reboot.
STEP 1) Check the devices and mount the root and boot
They might be on the same device here they are on different MD devices (in the case, software array). md1 is the boot and md2 is the root.
root@rescue ~ # cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sda5[3] sdb5[2]
422716416 blocks super 1.2 [2/2] [UU]
bitmap: 0/4 pages [0KB], 65536KB chunk
md2 : active raid1 sda3[3] sdb3[2]
31440896 blocks super 1.2 [2/2] [UU]
md1 : active raid1 sda2[3] sdb2[2]
523712 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda1[3] sdb1[2]
33521664 blocks super 1.2 [2/2] [UU]
unused devices: <none>
root@rescue ~ # mount /dev/md2 /mnt/
root@rescue ~ # mount /dev/md1 /mnt/boot/
root@rescue ~ # ls -altr /mnt/
total 396K
drwxr-xr-x. 2 root root 4.0K Apr 11 2018 srv
drwxr-xr-x. 2 root root 4.0K Apr 11 2018 opt
drwxr-xr-x. 2 root root 4.0K Apr 11 2018 mnt
drwxr-xr-x. 2 root root 4.0K Apr 11 2018 media
drwxr-xr-x. 2 root root 4.0K Apr 11 2018 home
lrwxrwxrwx. 1 root root 8 May 14 2018 sbin -> usr/sbin
lrwxrwxrwx. 1 root root 9 May 14 2018 lib64 -> usr/lib64
lrwxrwxrwx. 1 root root 7 May 14 2018 lib -> usr/lib
lrwxrwxrwx. 1 root root 7 May 14 2018 bin -> usr/bin
drwxr-xr-x. 13 root root 4.0K May 14 2018 usr
drwx------. 2 root root 16K Feb 12 2019 lost+found
drwxr-xr-x 2 root root 4.0K Feb 12 2019 boot
drwxr-xr-x 2 root root 4.0K Feb 12 2019 storage1
drwxr-xr-x 2 root root 4.0K Feb 12 2019 sys
drwxr-xr-x 2 root root 4.0K Feb 12 2019 dev
drwxr-xr-x 2 root root 4.0K Feb 12 2019 prochttps://www.google.com/search?client=firefox-b-d&q=samsung+tab10+2020
drwxr-xr-x 3 root root 4.0K Feb 12 2019 run
-rw-r-----. 1 root root 575 Feb 12 2019 installimage.conf
-rw-r-----. 1 root root 13K Feb 12 2019 installimage.debug
drwxr-xr-x. 20 root root 4.0K Feb 12 2019 var
drwxr-xr-x. 85 root root 4.0K Nov 2 2019 etc
-rw-r--r--. 1 root root 291K Nov 2 2019 .readahead
drwxr-xr-x. 19 root root 4.0K Nov 2 2019 .
dr-xr-x---. 6 root root 4.0K May 4 19:24 root
drwxrwxrwt. 7 root root 4.0K May 8 14:14 tmp
drwxr-xr-x 1 root root 160 May 8 16:57 ..
root@rescue ~ # ls -altr /mnt/boot/
total 194M
drwxr-xr-x. 3 root root 1.0K Sep 18 2017 efi
-rw-------. 1 root root 49M Sep 18 2017 initramfs-0-rescue-9063ac396d784f4c997ceacdd0590c25.img
-rwxr-xr-x. 1 root root 5.7M Sep 18 2017 vmlinuz-0-rescue-9063ac396d784f4c997ceacdd0590c25
-rw-------. 1 root root 3.4M Feb 1 2019 System.map-3.10.0-957.5.1.el7.x86_64
-rw-r--r--. 1 root root 149K Feb 1 2019 config-https://www.google.com/search?client=firefox-b-d&q=samsung+tab10+20203.10.0-957.5.1.el7.x86_64
-rw-r--r--. 1 root root 170 Feb 1 2019 .vmlinuz-3.10.0-957.5.1.el7.x86_64.hmac
-rwxr-xr-x. 1 root root 6.4M Feb 1 2019 vmlinuz-3.10.0-957.5.1.el7.x86_64
-rw-r--r--. 1 root root 307K Feb 1 2019 symvers-3.10.0-957.5.1.el7.x86_64.gz
drwx------. 2 root root 12K Feb 12 2019 lost+found
drwxr-xr-x. 2 root root 1.0K Feb 12 2019 grub
-rw-------. 1 root root 3.5M Oct 18 2019 System.map-3.10.0-1062.4.1.el7.x86_64
-rw-r--r--. 1 root root 150K Oct 18 2019 config-3.10.0-1062.4.1.el7.x86_64
-rw-r--r--. 1 root root 171 Oct 18 2019 .vmlinuz-3.10.0-1062.4.1.el7.x86_64.hmac
-rwxr-xr-x. 1 root root 6.5M Oct 18 2019 vmlinuz-3.10.0-1062.4.1.el7.x86_64
-rw-r--r--. 1 root root 312K Oct 18 2019 symvers-3.10.0-1062.4.1.el7.x86_64.gz
-rw-------. 1 root root 13M Nov 2 2019 initramfs-3.10.0-957.5.1.el7.x86_64kdump.img
-rw-------. 1 root root 47M Nov 2md 2019 initramfs-3.10.0-1062.4.1.el7.x86_64.img
-rw-------. 1 root root 46M Nov 2 2019 initramfs-3.10.0-957.5.1.el7.x86_64.img
-rw-------. 1 root root 13M Nov 2 2019 initramfs-3.10.0-1062.4.1.el7.x86_64kdump.img
dr-xr-xr-x. 6 root root 1.0K Nov 2 2019 .
drwxr-xr-x. 19 root root 4.0K Nov 2 2019 ..
drwx------. 5 root root 1.0K May 4 16:11 grub2
STEP 2) mount the dev, proc and sys relative to the root mount above and chroot in the root.
After chroot it is recommended to
root@rescue ~ # mount -o bind /dev /mnt/dev root@rescue ~ # mount -o bind /proc /mnt/proc root@rescue ~ # mount -o bind /sys /mnt/sys root@rescue ~ # chroot /mnt/ root@rescue / # cd root@rescue ~ # . /etc/profile
STEP 3)Install grub2
Unmount all mounted directories above and reboot.
root@rescue ~ # grub2-install /dev/sda Installing for i386-pc platform. Installation finished. No error reported. root@rescue ~ # grub2-install /dev/sdb Installing for i386-pc platform. Installation finished. No error reported. root@rescue ~ # exit root@rescue ~ # umount /mnt/boot root@rescue ~ # umount /mnt/dev root@rescue ~ # umount /mnt/proc root@rescue ~ # umount /mnt/sys root@rescue ~ # umount /mnt/ root@rescue ~ # reboot
* If you are using UEFI enabled boot you probably need more options for the grub installation
Something like that for the grub2 installation (but it is specific for your distro – the path for efi directory, just find it under /boot and put the right path – nothing special!):
grub-install --recheck --target=x86_64-efi --efi-directory=/boot/efi/ /dev/sda
Where does this error come from?
If you search the ID by part of it you will discover it under /dev/disk/by-id/, which is a link to md1, but still there is an error for missing device, because the kernel loaded the device as md-name-rescue:1. And if you reboot the kernel the old and wrong name won’t exists. As mentioned above this could have happened if you deleted partitions or made some disk layout changes (using parted?) on mounted or partitions in use and the kernel could loaded the partition changes.
[root@srv47 ~]# cd /dev/disk/by-id/ [root@srv47 by-id]# ls -altr total 0 drwxr-xr-x. 5 root root 100 4 May 9,14 .. lrwxrwxrwx. 1 root root 9 4 May 10,14 md-uuid-e4023626:e09f7c39:20ed5720:2ef1b5af -> ../../md0 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-uuid-ae63857c:b8d537f5:4c09ae48:48148f59 -> ../../md3 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-uuid-4a28f3a7:94dc6dc7:a40a7084:c21463d7 -> ../../md2 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-name-rescue:3 -> ../../md3 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-name-rescue:2 -> ../../md2 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-name-rescue:0 -> ../../md0 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-uuid-613f3f0b:b202bf03:a5664e17:b3d568a0 -> ../../md1 lrwxrwxrwx. 1 root root 9 4 May 10,14 md-name-rescue:1 -> ../../md1 drwxr-xr-x. 2 root root 680 4 May 12,16 . lrwxrwxrwx. 1 root root 9 8 May 12,01 wwn-0x500a075116bd3e33 -> ../../sda lrwxrwxrwx. 1 root root 9 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_171416BD3E33 -> ../../sda lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a075116bd3e33-part1 -> ../../sda1 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_171416BD3E33-part1 -> ../../sda1 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a075116bd3e33-part5 -> ../../sda5 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a075116bd3e33-part4 -> ../../sda4 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a075116bd3e33-part3 -> ../../sda3 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a075116bd3e33-part2 -> ../../sda2 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_171416BD3E33-part5 -> ../../sda5 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_171416BD3E33-part4 -> ../../sda4 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_171416BD3E33-part3 -> ../../sda3 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_171416BD3E33-part2 -> ../../sda2 lrwxrwxrwx. 1 root root 9 8 May 12,01 wwn-0x500a07511bb48b38 -> ../../sdb lrwxrwxrwx. 1 root root 9 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_18081BB48B38 -> ../../sdb lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a07511bb48b38-part5 -> ../../sdb5 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a07511bb48b38-part4 -> ../../sdb4 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a07511bb48b38-part3 -> ../../sdb3 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a07511bb48b38-part2 -> ../../sdb2 lrwxrwxrwx. 1 root root 10 8 May 12,01 wwn-0x500a07511bb48b38-part1 -> ../../sdb1 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_18081BB48B38-part5 -> ../../sdb5 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_18081BB48B38-part4 -> ../../sdb4 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_18081BB48B38-part3 -> ../../sdb3 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_18081BB48B38-part2 -> ../../sdb2 lrwxrwxrwx. 1 root root 10 8 May 12,01 ata-Micron_1100_MTFDDAK512TBN_18081BB48B38-part1 -> ../../sdb1