Booting from a SAN lets you use your system as the boot disk for your server instead of a directly attached (or internal) hard disk. By using a properly configured Fibre Channel HBA or blade server mezzanine adapter connected and zoned to the same switch or fabric as the system, you can configure a server to use a LUN presented from the system as its boot disk.
Benefits of a boot-from-SAN configuration
A boot-from-SAN configuration can simplify management in the data center. Separating the boot image from each server allows administrators to leverage their investments in
EMC systems to achieve high availability, better data integrity, and more efficient storage management. Other benefits can include:
Improved disaster tolerance
Reduced total cost through diskless servers
Rapid server re-purposing
Consolidation of image management
Risks of booting from the system
When using the system as a boot disk, EMC recommends that you shut down the host
server during any maintenance procedures that could make the boot disk unavailable to the host.
Better Protection (Replication, Clone, Snap)
Lower opex though more centralized server management
Microsoft Windows operating systems use virtual memory paging files that reside on the boot disk. If the paging file is unavailable to the memory management system when it needs it, the operating system will crash with a blue screen.
Any of these events could crash an operating system that is booting from the system:
Lost connection to the system (pulled or damaged cable connection)
System service/upgrade procedures, such as online microcode upgrades and/or configuration changes
System failures, including failed lasers on Fibre Channel ports
System power failure
Storage area network failures, such as Fibre Channel, switch components, or switch power failures
Storage area network service/upgrade procedures, such as firmware upgrades or hardware replacements
itstorage مرجعی تخصصی و حرفه ای برای یادگیری سیستم های ذخیره سازی اطلاعات و سیستم عامل های لینوکس بیس است. در itstorage با بهره گیری از نیروهای متخصص، باتجربه و با تحصیلات آکادمیک بالا، تمام تلاش خود را برای تهیه و تولید آموزش های با کیفیت و حرفه ای انجام می دهیم.