HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 198
Optical Container 12 OC-12
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Implementing SAN Internetworking Solutions 4 • Fast Ethernet - A transmission medium specified by IEEE 802.3 that carries information at 100 Mbps (full-duplex) in baseband form using Category-5 copper cable or fiber-optic cable. The specification was developed to enable faster communication of LAN-connected computers. Fast Ethernet is also called 100 Base-T. The iFCP protocol overhead for a fast Ethernet link is 6.3%, which provides a bandwidth of 93.70 Mbps (11.71 MBps) for storage traffic. • Optical Container 3 (OC-3) - A specification that defines the transport level for SONET traffic transmitted at 155.52 Mbps (full-duplex) using fiber-optic cable. - The iFCP protocol overhead for a PoS OC-3 link is 8.9%, which provides a bandwidth of 141.65 Mbps (17.71 MBps) for storage traffic. - The iFCP protocol overhead for an ATM OC-3 link is 17.9%, which provides a bandwidth of 127.74 Mbps (15.97 MBps) for storage traffic. • Optical Container 12 (OC-12) - A specification that defines the transport level for SONET traffic transmitted at 622.08 Mbps (full-duplex) using fiber-optic cable. - The iFCP protocol overhead for a PoS OC-12 link is 8.9%, which provides a bandwidth of 566.59 Mbps (70.82 MBps) for storage traffic. - The iFCP protocol overhead for an ATM OC-12 link is 17.9%, which provides a bandwidth of 510.98 Mbps (63.87 MBps) for storage traffic. • Gigabit Ethernet - A transmission medium specified by IEEE 802.3 that carries information at 1,000 Mbps (full-duplex) in baseband form using Category-5 copper or fiber-optic cable. The iFCP protocol overhead for a GbE link is 6.3%, which provides a bandwidth of 937.00 Mbps (117.12 MBps) for storage traffic. As a practical example, suppose the changes to a one-terabyte database must be backed up daily on a real-time basis. The changes constitute 10% of the database per eight-hour working day. Imposing a 2:1 data compression ratio and performing the computations yields a backup requirement of 1.74 MBps. An DS3 link (ATM) with a bandwidth of 4.32 MBps is the appropriate choice. This link provides nearly 2.5 times the required bandwidth to account for current storage traffic, unexpected burstiness, and capacity planning. 4-54 McDATA Products in a SAN Environment - Planning Manual