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If you’ve just installed CentOS 6 on software RAID 1 and it won’t boot off /dev/md0, try the following:

1. Using your CentOS install media, boot in to rescue mode

2. Once you are booted in to rescue mode, select the “start shell” option

3. Enter the following command:

chroot /mnt/sysimage

4. Re-install GRUB (/dev/md0 may be different for you depending on how you configured your software RAID)

grub-install /dev/md0

5. Reboot

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