244 IBM System Storage N series Hardware Guide5. Press S to continue.6. From the list of HBAs, select the supported HBA that you are using and press Enter. Thedriver for the selected HBA is configured in the Windows operating system.7. Follow the prompts to set up the Windows operating system. When prompted, set up theWindows operating system in a partition formatted with NTFS.8. The host system reboots and then prompts you to complete the server setup process asyou normally would do. The rest of the Windows installation is the same as a normalinstallation.Current limitations to Windows boot from SANThere are a number of advanced scenarios that are not currently possible in Windows bootfrom SAN environments: No shared boot images: Windows servers cannot currently share a boot image. Eachserver requires its own dedicated LUN to boot. Mass deployment of boot images requires Automated Deployment Services (ADS):Windows does not currently support mass distribution of boot images. Although cloning ofboot images can help here, Windows does not have the tools for distribution of theseimages. In enterprise configurations, however, Windows ADS can help. Lack of standardized assignment of LUN 0 to controller: Certain vendors’ storageadapters automatically assign logical unit numbers (LUNs). Others require that thestorage administrator explicitly define the numbers. With parallel SCSI, the boot LUN isLUN 0 by default. Fibre Channel configurations must adhere to SCSI-3 storage standards: In correctlyconfigured arrays, LUN 0 is assigned to the controller (not to a disk device) and isaccessible to all servers. This LUN 0 assignment is part of the SCSI-3 standard becausemany operating systems do not boot unless the controller is assigned as LUN 0. AssigningLUN 0 to the controller allows it to assume the critical role in discovering and reporting alist of all other LUNs available through that adapter. In Windows, these LUNs are reportedback to the kernel in response to the SCSI REPORT LUNS command.Unfortunately, not all vendor storage arrays comply with the standard of assigning LUN 0to the controller. Failure to comply with that standard means that the boot process mightnot proceed correctly. In certain cases, even with LUN 0 correctly assigned, the boot LUNcannot be found, and the operating system fails to load. In these cases (without HBA LUNremapping), the kernel finds LUN 0, but might not be successful in enumerating the LUNscorrectly.18.2.6 Windows 2008 Enterprise installationThe Windows 2008 server can be installed in two installations: Full installation Core installationFull installation supports GUI, and no roles such as print, file, or DHCP are installed bydefault. Core installation does not support any GUI. It supports only command line andWindows power shell, which is why it does not require higher memory and disk.Prerequisites: After you successfully install Windows 2003, you must add the remainingWWPN for all additional HBAs to the group and install the FCP Windows Host Utilities.
