HP StorageWorks EVA iSCSI Connectivity User Guide (5697-0511, August 2010)

• Configuring target discovery, page 93
• Starting the iSCSI Initiator, page 95
• Stopping the iSCSI Initiator, page 96
• Setting up storage for OpenVMS, page 96
Configuring TCP/IP services
Before you start the iSCSI Initiator, TCP/IP must be properly configured and enabled. The initiator
will only function with the TCP/IP stack provided by HP TCP/IP Services for OpenVMS. Only the basic
TCP/IP core functionality needs to be configured. Note that particular attention should be paid to the
system’s hostname, which is a defining element in the iSCSI Initiator name (a unique name assigned
to each host running the iSCSI Initiator software). TCP/IP must be running and the hostname must be
set before the iSCSI Initiator is loaded.
Configuring VLANs
While not mandatory, if the initiator will be operating on a shared network (a network not dedicated
solely to storage), it is suggested that storage traffic be isolated to a dedicated Virtual LAN (VLAN).
The VLAN will logically isolate storage traffic into its own subnet.
In order to configure and use a VLAN, the hosts, network switches, and targets must all support IEEE
802.1Q. For information on configuring VLANs on the OpenVMS hosts, see the HP OpenVMS Version
8.3 New Features and Documentation Overview and the HP OpenVMS System Management Utilities
Reference Manual. For information on configuring VLANs on the network switches, see your switch
manufacturer’s documentation. VLAN configuration on the mpx100/100b targets will be performed
during their installation and configuration (see section Installation and maintenance, page 57.)
Enabling Ethernet jumbo frames
If Ethernet jumbo frames are to be used for iSCSI traffic, they must be enabled on the initiators
(OpenVMS hosts), network switches, and targets. To enable jumbo frames system-wide on an OpenVMS
host node using the LAN_FLAGS system parameter, see the HP OpenVMS System Management Utilities
Reference Manual. To enable jumbo frames on a per-device basis, see the HP OpenVMS System
Manager’s Manual.
Configuring target discovery
The OpenVMS Software-Based iSCSI Initiator supports two target discovery mechanisms – manual
and iSNS. At least one of these methods must be configured on each iSCSI-enabled OpenVMS host:
• Manual target discovery
With manual target discovery, the initiator is supplied with a list of IP addresses for each iSCSI
target port. Each mpx100 has two iSCSI target ports. (The management port is not an iSCSI target
port.) An initiator using this discovery method will periodically poll each target port in its manual
discovery list to gather a list of accessible storage devices.
1. To create a manual target list, copy the file
SYS$COMMON:[SYSMGR]ISCSI$MANUAL_TARGETS.TEMPLATE
to
SYS$COMMON:[SYSMGR]ISCSI$MANUAL_TARGETS.DAT
The directory SYS$SPECIFIC:[SYSMGR] can be used if the file is to be node-specific rather
than cluster-wide.
EVA iSCSI Connectivity User Guide 93