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Chapter VII. iSCSI PDU Offload Target

Chelsio T5/T4 Unified Wire For Linux Page 128

4.8. Target Redirection Support

An iSCSI Target can redirect an initiator to use a different IP address and port (often called a

portal) instead of the current one to connect to the target. The redirected target portal can either

be on the same machine, or a different one.

4.8.1. ShadowMode for Local vs. Remote Redirection

The ShadowMode setting specifies whether the Redirected portal groups should be present on

the same machine or not. If ShadowMode is enabled, the redirected portal groups are on a

different system. If it is disabled then the redirected portal groups must be present on the same

system otherwise the target would fail to start.

Below is an example with ShadowMode enabled:

target:

#<snip>

# any login requests received on 10.193.184.81:3260 will be

# redirected to 10.193.184.85:3261.

[email protected]:3260,[2]

[email protected]:3261

# the PortalGroup “2” is NOT presented on the same system.

ShadowMode=Yes

#<snip>

Below is an example with ShadowMode disabled:

target:

#<snip>

# any login requests received on 10.193.184.81:3260 will be

# redirected to 10.193.184.85:3261

[email protected]:3260,[2]

[email protected]:3261

# the PortalGroup “2” IS present on the same system

ShadowMode=No

#<snip>

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