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Implementing SAN Internetworking Solutions
4
McDATA Products in a SAN Environment - Planning Manual
4-52
WAN Link Performance (Rate Limiting Enabled)
Figure 4-14
When configuring a SAN router for extended-distance operation over
an IP WAN link, the peak available bandwidth must be determined
or obtained from the network service provider, and storage traffic
over the link must be rate-limited accordingly.
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 or
channelized, the peak available bandwidth equals that portion of the
total link bandwidth allotted for storage traffic at peak use time.
The speed of SAN router traffic (iFCP or iSCSI protocol) must be rate
limited to the peak available bandwidth to prevent buffer overflow
and dropped packets at intervening IP link networking equipment.
Rate limiting is configured for SAN router ports as follows:
•
Eclipse 1620 SAN Router - Two user-configured intelligent ports
(ETHERNET 3 and 4) can be configured for IP network
connectivity.
•
Eclipse 2640 SAN Router - Four user-configurable intelligent
ports (13 through 16) can be configured for IP network
connectivity.
Rate limiting is set at the Element Manager application using the Port
Speed drop-down list of the FC/Ethernet Port Configuration dialog box.
The Port Speed drop-down list provides eight speed selections:
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