Chelsio Communications Terminator 6, Installation And User Manual, Page: 185 / 432

Chapter X. iSCSI PDU Offload Target
Chelsio Unified Wire for Linux 185
CHAP : When setting
iscsi_auth_order=CHAP
, initiator authorization will be performed at the
end of the login phase for an iSCSI normal session: before going to the full feature phase, the
target will check its ACL. If this iSCSI connection does not match any ACL provisioned, the
login attempt will be terminated.
iscsi_target_vendor_id
Options : A string of maximum of 8 characters, defaults to CHISCSI
The iscsi_target_vendor_id is part of the device identification sent by an iSCSI target in
response of a SCSI Inquiry request.
iscsi_chelsio_ini_idstr
Options : A string of maximum of 255
characters, defaults to “cxgb4i”.
For an iscsi connection, more optimization can be done when both initiator and target are running
Chelsio adapters and drivers.
This string is used to verify the initiator name received, and identify if the initiator is running Chelsio
drivers: if the initiator name contains the same substring as
iscsi_chelsio_ini_idstr
it is
assumed the initiator is running with the Chelsio iscsi initiator driver and additional offload
optimization is performed.
4.12. Performance Tuning
i. Apply the performance settings mentioned in the Performance Tuning section in the Unified
Wire chapter before proceeding.
ii. Ensure that Unified Wire is installed with iSCSI Performance configuration tuning.
iii. For T6 adapters, set ImmediateData=No in iSCSI target configuration file ( /etc/chelsio-
iscsi/chiscsi.conf ).
iv. Next, load the iSCSI PDU offload target driver ( chiscsi_t4 ) and run the chiscsi_set_affinity.sh
script to map iSCSI worker threads to different CPUs.
[root@host~]# chiscsi_set_affinity.sh
v. Configure MTU 9000 on all interfaces.
For maximum performance, it is recommended to use iSCSI PDU offload initiator.
Note
iscsi_auth_order has no meaning when
ACL_Enable
is set to
No
on a target.