McDATA StorageWorks 2/140 - Director Switch Planning Manual page 276

Configuration Planning Tasks
6
McDATA Products in a SAN Environment - Planning Manual
6-32
• 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
remote data replication (RDR/S) or asynchronous remote data
replication (RDR/A). Based on 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
Transport Technologies
• 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
information.
and
for detailed information.
and Intelligent Port Speed
SAN Extension
for detailed