Advanced Fcip Features; Fcip Write Acceleration - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Chapter 40 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.
The write acceleration feature is disabled by default and must be enabled on both sides of the FCIP link.
Note
If it is only enabled on one side of the FCIP tunnel the write acceleration feature will be turned
operationally off.
In Figure
(RTT), 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-16184-01, Cisco MDS SAN-OS Release 3.x
FCIP Write Acceleration, page 40-27
Configuring FCIP Write Acceleration, page 40-29
Displaying Write Acceleration Activity Information, page 40-29
FCIP Tape Acceleration, page 40-30
Configuring FCIP Tape Acceleration, page 40-34
Displaying Tape Acceleration Activity Information, page 40-35
FCIP Compression, page 40-36
Configuring FCIP Compression, page 40-37
Displaying FCIP Compression Information, page 40-38
40-13, the WRITE command without write acceleration requires two round trip transfers
Cisco MDS 9000 Family CLI Configuration Guide
Configuring FCIP
40-27