Boot existing server from SAN

Did it once and it worked like a charm:

- it was a windows host. I presented a lun to it as large as the local drive.
- Made sure the HBA driver was loaded and that lun was visible.
- Used Ghost to copy data from the local drive to the lun.
- Configured the HBAs to boot from the lun

The server booted from SAN without any problems.

Boot Specific Requirements
A number of boot specific factors must be considered in order to correctly deploy a boot from SAN solution.
Boot Bios
¿ Ensure that the correct boot BIOS is on the HBA; without this the HBA may not detect any disks on the SAN.
¿ The default setting for the HBA boot BIOS is typically disabled; this must be enabled on only one adapter per server in order to boot from SAN.
HBA Driver
¿ Ensure that the HBA driver is appropriate for the boot configuration design. The SCSIport driver, which was designed for parallel SCSI solutions, is not the appropriate driver for high performance SAN configurations; instead use a Storport miniport driver with Windows Server 2003, as it is specifically designed for such solutions.
¿ The Storport driver features improved reset handling, which makes it possible to boot from SAN and have clusters running on the same adapters. Storport also allows for queue management, which is critical in a SAN fabric where fabric events such as adding or removing devices are common. Further details on the Storport driver can be found in the white paper, Storport in Windows Server 2003: Improving Manageability and Performance in Hardware RAID and Storage Area Networks.
Designate Boot Disk
¿ Each server must have access to its own boot drive. Designate as many boot disks (or LUNs) in the storage array as there are servers accessing the storage in that array.
¿ For each server to access the correct boot disk, a setting on the HBA boot BIOS must be changed to reflect the address of the disk or LUN on the SAN.

Yours is the long version. It's true, but mine was simply the short version. For me it worked
Simply run Ghost, config the HBAs to have the LUN with the OS as the boot LUN and go go goooooooooo.