Você pode tentar o modo de recuperação em um disco de instalação do CentOS. link
Eu tenho três discos em um servidor centos mas ele ganhou boot, eu não tenho nenhum grub em tudo.Eu tentei instalar grub com super grub e consertar o sistema com rescatux mas em vão.Há uma maneira de inicializar em centos? Aqui está o relatório
============================= Boot Info Summary: ===============================
=> install-mbr/Testdisk is installed in the MBR of /dev/sda.
=> Lilo is installed in the MBR of /dev/sdb.
=> Grub2 (v1.97-1.98) is installed in the MBR of /dev/sdc and looks at sector
1 of the same hard drive for core.img. core.img is at this location and
looks for (md/0)/boot/grub on this drive.
=> Syslinux MBR (5.00 and higher) is installed in the MBR of /dev/sdd.
sda1: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sda2: __________________________________________________________________________
File system: swap
Boot sector type: Unknown
Boot sector info:
sda3: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System: CentOS release 5.3 (Final)
Boot files: /etc/fstab
sdb1: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sdb2: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sdb3: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sdc1: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sdc2: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sdc3: __________________________________________________________________________
File system: ext3
Boot sector type: -
Boot sector info:
Operating System:
Boot files:
sdd1: __________________________________________________________________________
File system: vfat
Boot sector type: SYSLINUX 6.03 2014-10-06................................................2....0............A20 gate n
Boot sector info: Syslinux looks at sector 32832 of /dev/sdd1 for its
second stage. SYSLINUX is installed in the /multiboot
directory. No errors found in the Boot Parameter Block.
Operating System:
Boot files: /multiboot/rescatux-0.40b11/efi/boot/bootia32.efi
/multiboot/rescatux-0.40b11/efi/boot/bootx64.efi
============================ Drive/Partition Info: =============================
Drive: sda
Você pode tentar o modo de recuperação em um disco de instalação do CentOS. link