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The HP Workstation xw6200 is equipped with two SCSI HDDs and a Logic LSI SCSI adapter. Backing up CentOS from an other workstation and restoring to this HP workstation might meet the boot failure problem. The problem comes from the Linux SCSI kernel modules don’t be load. A solution to this problem is to use a Linux rescue CD to boot the HP workstation, mount the root partition, chroot to the root partition and rebuild a new initrd image which preload the SCSI modules. The SCSI module for the Logic LSI SCSI adapter is mptspi.ko. The example command for rebuild is:
mkinitrd --preload mptspi /boot/initrd 2.6.11