I wanted to be able to export iscsi volumes from SmartOS and not worry about them changing GUIDs on reboot. The first file goes in /opt/custom/bin and the second in /opt/custom/smf

enable-iscsi

#!/bin/sh

set -o xtrace

. /lib/svc/share/smf_include.sh

cd /
PATH=/usr/sbin:/usr/bin:/opt/custom/bin:/opt/custom/sbin; export PATH

case "$1" in
'start')
        #Enable the needed services
        svcadm enable -r svc:/network/iscsi/target:default
        #Setup the ISCSI Target for the DVR
        sbdadm create-lu /dev/zvol/rdsk/zones/dvr-iscsi
        guid=`sbdadm list-lu | grep -w dvr-iscsi |awk '{print $1}'`
        stmfadm add-view ${guid}
        itadm create-target -n iqn.2010-08.org.illumos:02:dvr-iscsi

    ;;

'stop')
    ### Insert code to execute on shutdown here.
    ;;

*)
    echo "Usage: $0 { start | stop }"
    exit $SMF_EXIT_ERR_FATAL
    ;;
esac
exit $SMF_EXIT_OK

iscsi.xml

<?xml version="1.0"?>
<!DOCTYPE service_bundle SYSTEM "/usr/share/lib/xml/dtd/service_bundle.dtd.1">
<service_bundle type="manifest" name="custom:iscsi">
        <service name="custom/iscsi" type="service" version="1">
        <create_default_instance enabled="true"/>
        <single_instance/>
        <dependency name = 'network-physical'
            grouping='require_all'
            restart_on='none'
            type='service'>
            <service_fmri value='svc:/network/physical:default'/>
        </dependency>
        <dependency name = 'filesystem-local'
            grouping='require_all'
            restart_on='none'
            type='service'>
            <service_fmri value='svc:/system/filesystem/local:default'/>
        </dependency>


                <exec_method type="method" name="start" exec="/opt/custom/bin/enable-iscsi start" timeout_seconds="0">
                </exec_method>

                <exec_method type="method" name="stop" exec=":true" timeout_seconds="0">
                </exec_method>

                <property_group name="startd" type="framework">
                        <propval name="duration" type="astring" value="transient"/>
                </property_group>

                <stability value="Unstable"/>
        </service>
</service_bundle>