Dell Brocade 1020 Brocade Adapters Installation and Reference Manual - Page 156
Brocade BIOS support for boot over SAN, First LUN, Flash Values
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4 Boot over SAN Brocade BIOS support for boot over SAN The Brocade adapter boot BIOS provides boot support for the Brocade adapters in x86 and x64 host platforms. The BIOS can discover up to 256 storage targets, such as RAID units, and the logical unit numbers (LUNs) on those units when the LUNs are bound to adapter ports. When adapter BIOS is enabled, the boot code loads from adapter option ROM into system random access memory (RAM) and integrates with the host system (server) BIOS during system boot to facilitate booting from LUNs, which are also referred to as "virtual drives" and "boot devices." LUNs targeted as boot devices must contain the boot image for the host's operating system and adapter driver. The process for booting from these locations is referred to as "booting over SAN." Boot over SAN can be supported on a maximum of 16 ports (for example, 8 dual-port adapters). For more information and configuration procedures for booting over SAN, refer to "Configuring boot over SAN" on page 131. NOTE You can enable or disable BIOS for boot over SAN, set port speed (HBAs and Fabric Adapter port configured in HBA mode only), and display adapter BIOS settings using BCU commands. By default, BIOS is enabled on all adapter ports. The Brocade BIOS Configuration Utility (embedded with the boot code), BCU commands, and the HCM allow you to perform the following tasks: • Enable or disable BIOS. When enabled, the system BIOS can execute the Brocade BIOS code to boot over SAN. • Set port speed (HBAs and Fabric Adapter ports configured in HBA mode only): • Review adapter properties, such as the following: - Port speed - PWWN - NWWN - BIOS version • Select a boot device from discovered targets. • Enable one of the following boot LUN options. NOTE To boot from direct-attached Fibre Channel targets, you must use the First LUN or Flash Values options. - Fabric Discovered. When enabled, boot information, such as the location of the boot LUN, is provided by the fabric (refer to "Fabric-based boot LUN discovery" on page 163 for more information). 128 Brocade Adapters Installation and Reference Manual 53-1002144-01