HP EVA Array iSCSI Connectivity Option - Manual (Page 91)

been removed from this file will not be removed from the initiator's scan list until the system is
rebooted or the initiator is stopped and restarted.
NOTE:
Regardless of whether IP addresses or IP names are used in the manual target data file, every
iSCSI target port must be known to TCP/IP. The command TCPIP SHOW HOST can be used to
determine if the target port is known to TCP/IP. The host can be added to the local TCP/IP host
database with the command TCPIP SET HOST. A target port not known to TCP/IP will not be probed
by the iSCSI Initiator.
NOTE:
The default TCP/IP port used for iSCSI traffic is 3260. If a non-default port is to be utilized, the
addresses listed in the manual targets file must include the port number. The header included in
this file defines the format that must be used when including a port number. There is no need to
include the port number if the default will be used. Additionally, if a non-default port number is to be
utilized, the iSCSI ports on the mpx100 must be configured with that non-default port number.
NOTE:
The OpenVMS Software-Based iSCSI Initiator does not currently support IPv6. All IP addresses
must be IPv4.
• iSNS target discovery
The Internet Storage Name Service (iSNS) protocol provides a target discovery mechanism similar
to the discovery services found in Fibre Channel. Among the capabilities provided by iSNS is the
ability for storage targets to register with an iSNS server. Acting as iSNS clients, initiators are able
to query this server to retrieve a lost of potential targets. The initiator can then use this list to query
the individual targets to find its storage devices.
The use of iSNS requires the availability of an iSNS server that is network accessible by both the
storage targets and the initiators (OpenVMS hosts). Currently, the Microsoft iSNS Server is the only
iSNS server supported for use with the OpenVMS Software-Based iSCSI Initiator.
To use iSNS target discovery, both the initiators and targets must be properly configured with the IP
address of the iSNS server.
1. To configure the OpenVMS initiators for iSNS, copy the file
SYS$COMMON: [SYSMGR] ISCSI$ISNS_SERVICES.TEMPLATE
to
SYS$COMMON: [SYSMGR] ISCSI$ISNS_SERVICES.DAT
The directory SYS$SPECIFIC:[SYSMGR] can be used if the file is to be node-specific rather than
cluster-wide.
2. Edit the new file and add a list of the IP names or addresses of the iSNS servers that should be
probed for available targets.
The header in this file defines the proper format for these addresses. The iSNS server list is
automatically loaded when the iSCSI Initiator is started. By default, changes to this file do not take
effect until the system is rebooted or until the initiator is stopped and restarted.
3. To manually force the initiator to recognize additions to the iSNS server list while the initiator is
running, issue the following command:
$ mcr iscsi$control_program isns
iSNS servers that have been added to this file since the initiator was started will be added to the
list of servers that are periodically queried by the initiator. Not that servers that have been removed
from this file will not be removed from the initiator's scan list until the system is rebooted or the
initiator is stopped and restarted.
EVA iSCSI connectivity user guide 91