Cisco AP775A - Nexus Converged Network Switch 5010 User Manual

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50-34
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 50 Configuring iSCSI
Configuring iSCSI
Figure 50-29 iSCSI Routing Modes
Table 50-1 compares the advantages and disadvantages of the different iSCSI routing modes.
Data1
Data2
iSCSI Data-
in PDU #1,
DSlen = 1KB
Data16
Status
iSCSI
Data-in
PDU #16
Command1
Command
Response1
Command2
Data1
Data16
Status
TCP part 16
Command1
Command
Response1
Command2
Data1
Data16
Status
TCP part 16
Command1
Command
Response1
Command2
TCP part 2
Pass -Thru
Store -Forward
Cut -Thru
iSCSI initiator MDS FC Target iSCSI initiator MDS FC Target iSCSI initiator MDS FC Targ
TCP part 1
contains iSCSI
Data-in PDU #1
DSlen = 16KB
Wait for all
Data to
arrive
TCP part 2
Data2
Data frame is
forwarded as
it is received
130687
iSCSI
Data-in
PDU #2
TCP part 1
contains iSCSI
Data-in PDU #1
DSlen = 16KB
Ta b l e 50-1 Comparison of iSCSI Routing Modes
Mode Advantages Disadvantages
Pass-thru Low-latency
Data digest can be used
Lower data transfer performance.
Store-and-forward Higher data transfer
performance
Data digest cannot be used.
Cut-thru Improved read performance
over store-and-forward
If the Fibre Channel target sent read data for
different commands interchangeably, data of the
first command is forwarded in cut-thru mode but
the data of subsequent commands is buffered
and the behavior is the same as
store-and-forward mode.
Data digest cannot be used.

Cisco AP775A - Nexus Converged Network Switch 5010 Specifications

General

Brand	Cisco
Model	AP775A - Nexus Converged Network Switch 5010
Category	Switch
Language	English