Figure 35-13 compares the messages exchanged by the iSCSI routing modes.Table35-1 compares the advantages and dissuasiveness of the different iSCSI routing modes.
Data1
Data2
iSCSIData-
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

iSCSIinitiator MDS FC Target iSCSIinitiator MDS FC Target iSCSIinitiator MDS FC Target
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
Mode Advantages Disadvantages