You can use esxcli iscsi session to log in to a session.

Specify one of the options listed in Connection Options for vCLI Host Management Commands in place of <conn_options>.

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Log in to a session on the current software iSCSI or dependent hardware iSCSI configuration at the adapter level. 

esxcli <conn_options> iscsi session add --adapter=<adapter_name>

The following example applies custom values. 

esxcli --config /host-config-file iscsi session add --adapter=vmhba36
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Log in to a session on the current software iSCSI or dependent hardware iSCSI configuration at the target level. 

esxcli <conn_options> iscsi session add --name=<target> --adapter=<adapter_name>

The following example applies custom values. 

esxcli --config /host-config-file iscsi session add -name=iqn.xxx --adapter=vmhba36
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Add duplicate sessions with target and session IDs in current software iSCSI or dependent hardware iSCSI configuration. 

esxcli <conn_options> iscsi session add --name=<iqn.xxxx> --isid=<session_id> --adapter=<iscsi_adapter>

iqn.xxxx is the target IQN, which you can determine by listing all sessions. session_id is the session's iSCSI ID. The following example applies custom values. 

esxcli --config /host-config-file iscsi session add -name=iqn.xxx --isid='00:02:3d:00:00:01' --adapter=vmhba36