3–Open-iSCSI User’s Guide
Open-iSCSI Supported Features
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Open-iSCSI Supported Features
Open-iSCSI support has been added to the QLogic iSCSI driver in Red Hat
Enterprise Linux 6.2 and SUSE Linux Enterprise Server 11 Service Pack 2.
Open-iSCSI infrastructure supports discovery, login to and logout from iSCSI
targets, and modification and display of iSCSI configuration parameters. The
QLogic iSCSI driver provides persistence through Flash and Open-iSCSI nodes
and sendtargets databases.

Discovery, Login, and Logout

Prior to RHEL 6.2 and SLES 11 SP2, discovery and login to iSCSI targets was
hardware offloaded and managed by the QLogic iSCSI adapter firmware. In
RHEL 6.2 and SLES 11 SP2, the Open-iSCSI infrastructure allows the system
administrator to manage QLogic iSCSI target discovery and login through the
QLogic adapter. This provides the system administrator with a uniform and
standard way to manage different vendor interfaces.

Boot Target Login

Default Behavior on RHEL 6.2

Open-iSCSI is enabled by default on RHEL 6.2 and login to boot targets is
triggered by iscsistart through sysfs. The default behavior can be changed by
setting ql4xdisablesysfsboot to 1, this disables exporting boot targets in
Flash to sysfs and login to boot targets is done by the driver.
1. With ql4xdisablesysfsboot=0, list boot targets if present.
# iscsiadm -m fw
2. Disable sysfs boot.
# echo "options qla4xxx ql4xdisablesysfsboot=1" >>
/etc/modprobe.d/qla4xxx.conf
3. Reload the qla4xxx driver.
# rmmod qla4xxx
# modprobe qla4xxx
4. Update ramdisk.
Reboot the system, if the system is booted using the iSCSI boot target.