Allied Telesis AT-2973T Making Connections to iSCSI Targets, Maximizing Offload iSCSI Connections

AT-2973SX, AT-2973T, and AT-2973T/4 NetExtreme II Family Adapters Installation and User’s Guide

If you want to switch back to using the software initiator, enter the following:

iscsiadm --mode node --targetname iqn.2004- 06.com.broadcom:tg1 \

--portal 192.168.1.100 --op=update \ --name=node.transport_name --value=tcp

Making Connections to iSCSI Targets

Refer to open-iscsi documentation for a comprehensive list of iscsiadm commands. The following is a sample list of commands to discovery targets and to create iscsi connections to a target:

Adding static entry

iscsiadm -m node -p <ipaddr[:port]> -T iqn.2007- 05.com.broadcom:target1 -o new

iSCSI target discovery using 'SendTargets'

iscsiadm -m discovery --type sendtargets -p <ipaddr[:port]>

Login to target using 'iscsiadm' command

iscsiadm --mode node --targetname <iqn.targetname> -- portal <ipaddr[:port]> --login

List all drives active in the system

'fdisk -l'

Maximizing Offload iSCSI Connections

With default driver parameters set, which includes 128 outstanding commands, bnx2i can offload a maximum of 28 iSCSI connections. This is not a hard limit, but simple on-chip resource allocation math. The bnx2i driver can offload > 28 connections by reducing the shared queue size which, in turn, limits the maximum outstanding tasks on a connection. See “Setting Values for Optional Properties” on page 74 for information on sq_size and rq_size. The driver logs the following message to syslog when the maximum allowed connection offload limit is reached - "bnx2i: unable to allocate iSCSI context resources."

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