Enabling Fcip Compression - Cisco DS-C9216I-K9 Configuration Manual

Chapter 24 Configuring IP Storage
Figure 24-13
RTT1
RT2
RTT1
In Figure
Ready. This way the actual write operation may be done in a less time than the write operation without
the write acceleration feature being enabled.
FCIP write acceleration will not work if the FCIP port is part of a PortChannel or if there are multiple
Tip
paths with equal weight between the initiator and the target port. Such a configuration might cause either
SCSI discovery failure or broken write or read operations.

Enabling FCIP Compression

The FCIP compression feature introduced in Release 1.3(x) allows IP packets to be compressed on the
FCIP link if this feature is enabled on that link. By default the FCIP compression is disabled.
This feature uses the Lempel-Zif-Stac (LZS) compression algorithm to compress packets.
The high-throughput mode allows faster compression but the compression ratio may be lower. The
high-comp-ratio mode allows a higher compression ratio, but the throughput may be lower.
OL-7753-01
FCIP Link Write Acceleration
Initiator MDS 9000
Initiator MDS 9000
Transfer ready
24-13, some data sent by the host is queued on the target before the target issues a Transfer
MDS 9000
FCIP over
WAN
Command
Transfer ready
Data transfer
Status
MDS 9000
FCIP over
WAN
Command
Data transfer
Status
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
Configuring FCIP
Target
FC FC
Without
acceleration
Target
FC FC
Transfer ready
With
acceleration
24-21