HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 280

Configuration Planning Tasks 6 • IP network connections - At each location, cables with appropriate connectors must be routed between the IP transport network and the SAN router. The Eclipse 1620 SAN Router supports Ethernet RJ-45 connectors or SFP optical transceivers with LC duplex connectors. The Eclipse 2640 SAN Router supports SFP optical transceivers with LC duplex connectors. • Establish operational mode and transport technology - Establish if the operational mode is expected to support synchronous data replication (SDR) or asynchronous data replication (ADR). Based on the operational mode requirement, establish the IP WAN transport technology as follows: - Repeated or unrepeated dark fiber. - Wavelength division multiplexing (WDM). - Synchronous optical network (SONET) and synchronous digital hierarchy (SDH). - Internet protocol. Refer to Extended-Distance Operational Modes and SAN Extension Transport Technologies for detailed information. • Determine peak available bandwidth - The peak available bandwidth for data transport (exclusive of protocol overhead) must be determined or obtained from the network service provider. If the IP WAN link is dedicated, the peak available bandwidth equals the total link bandwidth. This implies that no other application data or traffic is routed across the link. If the IP WAN link is shared, the peak available bandwidth equals that portion of the total link bandwidth allotted for storage traffic at peak use time. Data ingress must not exceed peak available bandwidth or downstream network device buffers fill, overflow, and drop data packets. Dropped packets cause congestion and result in reduced link throughput. To prevent this problem, enable rate limiting to ensure the ingress data rate does not exceed the egress rate of the slowest link in the IP WAN path. Refer to IRL Optimization and Intelligent Port Speed for detailed information. 6-32 McDATA Products in a SAN Environment - Planning Manual