HP-UX iSCSI Software Initiator Support Guide (Edition 7)

on an iSCSI target. Also, the boot, root, primary swap, and dump file systems are not supported
on iSCSI volumes.
7.3 iSCSI Software Interface Driver Technical Specifications
7.3.1 Features
• The iSCSI SWD conforms to the iSCSI Protocol Specification (RFC 3720).
• The iSCSI SWD will function over standard NICs (Network Interface Cards).
• The iSCSI SWD will be a compute-intensive driver.
7.3.2 Limitations
• The iSCSI SWD does not support the definition of the boot, root, primary swap, dump, or var
volumes on iSCSI logical units.
• The iSCSI SWD supports only IPv4 addresses.
7.4 iSCSI Software Interface Driver Configuration
Existing networking commands must be used to establish routing information and LAN configuration
for host based networking.
The user is expected to understand the Service Location Protocol (SLP) dynamic scanning technique
in order to use it. SLP is a software component separate from the iSCSI SWD. SLP is used optionally
by iSCSI for maintaining a dynamic name server (DNS) capability. See Table 2: “SLP Server
Installation Information and Related Documents” (page 15), for more SLP information.
7.5 Kernel Build
The isw statement in the /stand/system file results in the inclusion of the iSCSI Software Interface
Driver module, as well as the execution of the iswd daemon, during system startup.
7.6 iSCSI Software Interface Driver Management
If the iscsiutil command is directed to the/dev/isw device file, the command is explicitly
directed to the iSCSI SWD. Most command sequences require root or super user permission. The
iscsiutil command can be used to:
• Display the iSCSI Software Interface Driver statistics:[LINEBREAK][LINEBREAK] # iscsiutil
/dev/isw -s -G[LINEBREAK][LINEBREAK]-G displays the iSCSI Software
Interface Driver global statistics.
• Clear the iSCSI Software Interface Driver statistics:[LINEBREAK][LINEBREAK]# iscsiutil
/dev/isw -c -G
• Display the iSCSI Software Interface Driver name and version:[LINEBREAK][LINEBREAK] #
iscsiutil /dev/isw
The iscsiutil tool requires the /dev/isw device file for its access to the iSCSI Software
Interface Driver. This file will be created when the iSCSI Software Interface Driver is installed.
Device files are created to access the iSCSI transport and Software Interface Drivers:
• The iSCSI Software Interface Driver provides a low level interface to the network stack.
• The /dev/isw devicefile, which is created during installation, provides an interface to the
iSCSI Software Interface Driver.
7.3 iSCSI Software Interface Driver Technical Specifications 37