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IBM System Storage N series Hardware Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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Boot from SAN
Storage area network (SAN) boot is a technique that allows servers to use an operating system (OS) image installed on external SAN-based storage to boot. The term SAN booting means using a SAN-attached disk, such as a logical unit number (LUN), as a boot device for a SAN host.
Fibre Channel SAN booting does not require support for special SCSI operations. It is no different from any other SCSI disk operation. The host bus adapter (HBA) communicates with the system BIOS, which enables the host to boot from a LUN on the storage system. ...

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