He probado algunas cosas.
La salida de fdisk-l es:
[root@localhost mohit_dubey]# fdisk -l
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes, 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: gpt
# Start End Size Type Name
1 2048 206847 100M EFI System EFI System Partition
2 206848 411647 100M Microsoft basic
3 411648 409372671 195G Linux LVM
4 409372672 451315711 20G Microsoft basic
Disk /dev/sdb: 8076 MB, 8076132352 bytes, 15773696 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x13f6b0ea
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 15773695 7885824 c W95 FAT32 (LBA)
Disk /dev/mapper/centos-root: 207.2 GB, 207232172032 bytes, 404750336 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
la salida de grub2-mkconfig > /dev/null:
[root@localhost mohit_dubey]# grub2-mkconfig > /dev/null
/usr/bin/grub2-editenv: error: cannot open `/boot/grub2/grubenv.new': No space left on device.
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-327.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-327.el7.x86_64.img
hecho
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Respuesta1
No soy un profesional en Linux basado en Redhat, pero en Debian y Arch necesitas instalar un paquete llamado os-probery luego recrear la configuración de Grub.