Chelsio Communications Chelsio T5 User's Guide download pdf (Page 143)

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Chapter VIII. iSCSI PDU Offload Initiator

Chelsio T5/T4 Unified Wire For Linux Page 143

4. Software/Driver Configuration and Fine-tuning

4.1. Accelerating open-iSCSI Initiator

The following steps need to be taken to accelerate the open-iSCSI initiator:

4.1.1. Configuring iscsid.conf file

Edit the iscsi/iscsid.conf file and change the setting for MaxRecvDataSegmentLength:

node.conn[0].iscsi.MaxRecvDataSegmentLength = 8192

The login would fail for a normal session if MaxRecvDataSegmentLength is too big. An error

message in the format of ERR! MaxRecvSegmentLength <X> too big. Need to be <=

<Y>. would be logged in dmesg.

4.1.2. Configuring interface (iface) file

Create an interface file located under iface directory for the new transport class cxgb4i in the

following format:

iface.iscsi_ifacename = <iface file name>

iface.hwaddress = <MAC address>

iface.transport_name = cxgb4i

iface.net_ifacename = <ethX>

iface.ipaddress = <iscsi ip address>

 Always take a backup of iscsid.conf file before installing Chelsio

Unified Wire Package. Although the file is saved to iscsid.rpmsave

after uninstalling the package using RPM, you are still advised to take a

backup.

 In case of RHEL 6, uninstalling the package using RPM will result into

uninstallation of open-iSCSI admin utility. In order to get back the utility,

please install open-iscsi-utils provided with OS CD/DVD.

Important

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