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Chapter 33
Configuring FCIP
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Advanced FCIP Features
You can significantly improve application performance by configuring one or more of the following
options for the FCIP interface.
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FCIP Write Acceleration
The FCIP write acceleration feature enables you to significantly improve application write performance
when storage traffic is routed over wide area networks using FCIP. When FCIP write acceleration is
enabled, WAN throughput is maximized by minimizing the impact of WAN latency for write operations.
Note
The write acceleration feature is disabled by default and must be enabled on both sides of the FCIP link.
If it is only enabled on one side of the FCIP tunnel, the tunnel is not initialized.
In
Figure
while the WRITE command with write acceleration only requires one RTT, The maximum sized Transfer
Ready is sent from the host side of the FCIP link back to the host before the WRITE command reaches
the target. This enables the host to start sending the write data without waiting for the long latency over
the FCIP link of the WRITE command and Transfer Ready. It also eliminates the delay caused by
multiple Transfer Readys needed for the exchange going over the FCIP link.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
FCIP Write Acceleration, page 33-19
FCIP Tape Acceleration, page 33-21
FCIP Compression, page 33-23
33-8, the WRITE command without write acceleration requires two round trip transfers (RTT),
Advanced FCIP Features
Cisco MDS 9000 Family Configuration Guide
33-19
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