Cisco MDS 9000系列在HP/UX与AIX高可用性中的优势
白皮书 作者： Cisco(思科) 2006-11-10
摘 要：
When migrating servers from direct-attached or internal storage models to a networked infrastructure like a SAN, a method must be followed to allow servers to communicate with the storage devices that they wish to utilize. This process generally involves mapping an attribute of the storage device itself to an attribute in the server operating system. Commonly, in server operating systems, a block device identifier is mapped to a Fibre Channel World-Wide-Name (WWN) identifier. The WWN provides a globally unique identifier for the storage device that is persistent and is burned directly into the device controller. The resultant OS-based block device which is mapped to the WWN might then be used to build a file system or used within a database application. In order for a host to actually communicate with the storage device represented by the WWN, it must utilize the Fibre Channel fabric Simple Name Server to derive the assigned route-able Fibre Channel ID (FC_ID) of the storage device. The Fibre Channel protocol stack within the server then utilizes this FC_ID to communicate directly with the target device through the routed Fibre Channel SAN. Figure 1 shows a simplified sequence of events including the registration of device WWNs and the assignment of FC_IDs which facilitates the communication between two devices in a Fibre Channel SAN.
When migrating servers from direct-attached or internal storage models to a networked infrastructure like a SAN, a method must be followed to allow servers to communicate with the storage devices that they wish to utilize. This process generally involves mapping an attribute of the storage device itself to an attribute in the server operating system. Commonly, in server operating systems, a block device identifier is mapped to a Fibre Channel World-Wide-Name (WWN) identifier. The WWN provides a globally unique identifier for the storage device that is persistent and is burned directly into the device controller. The resultant OS-based block device which is mapped to the WWN might then be used to build a file system or used within a database application. In order for a host to actually communicate with the storage device represented by the WWN, it must utilize the Fibre Channel fabric Simple Name Server to derive the assigned route-able Fibre Channel ID (FC_ID) of the storage device. The Fibre Channel protocol stack within the server then utilizes this FC_ID to communicate directly with the target device through the routed Fibre Channel SAN. Figure 1 shows a simplified sequence of events including the registration of device WWNs and the assignment of FC_IDs which facilitates the communication between two devices in a Fibre Channel SAN.
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