You can enable settings related to the discovery of storage
devices in an iSCSI network. The Target Discovery Settings allow you
to register the storage array's iSCSI information using the Internet
Storage Name Service (iSNS) protocol, and also determine whether to
allow unnamed discovery sessions.
Before
you begin
If the iSNS server uses a static IP address, that
address must be available for iSNS registration. Both IPv4 and IPv6
are supported.
About
this task
You can enable the following settings related to
iSCSI discovery:
- Enable iSNS server
to register a target – When enabled, the storage array registers
its iSCSI Qualified Name (IQN) and port information from the iSNS
server. This setting allows iSNS discovery, so that an initiator
can retrieve the IQN and port information from the iSNS server.
- Enable unnamed discovery
sessions – When unnamed discovery sessions are enabled, the
initiator (iSCSI host) does not need to provide the IQN of the target
(controller) during the login sequence for a discovery-type connection.
When disabled, the hosts do need to provide the IQN to establish a
discovery-session to the controller. However, the target IQN is always
required for a normal (I/O bearing) session. Disabling this setting
can prevent unauthorized iSCSI hosts from connecting to the controller
using only its IP address.
Note: The iSCSI
settings and functions only display on the Settings page if your storage
array supports iSCSI.
- Select .
- Under iSCSI settings , click View/Edit Target
Discovery Settings .
The Target Discovery Settings dialog box appears. Below the Enable iSNS server ... field, the dialog box indicates if the controller is already
registered.
- To register
the controller, select Enable iSNS server to register
my target , and then select one of the following:
- Automatically
obtain configuration from DHCP server – Select this option if
you want to configure the iSNS server using a Dynamic Host Configuration
Protocol (DHCP) server. Be aware that if you use this option, all
iSCSI ports on the controller must be configured to use DHCP as well.
If necessary, update your controller iSCSI port settings to enable
this option.
Note: For the DHCP server to provide the iSNS server address,
you must configure the DHCP server to use Option 43 – “Vendor Specific
Information.” This option needs to contain the iSNS server IPv4 address
in data bytes 0xa-0xd (10-13).
- Manually
specify static configuration – Select this option if
you want to enter a static IP address for the iSNS server. (If desired,
you can cut and paste addresses into the fields.) In the field, enter
either an IPv4 address or an IPv6 address. If you configured both,
IPv4 is the default. Also enter a TCP listening port (use the default
of 3205 or enter a value between 49152 and 65535).
- To allow the
storage array to participate in unnamed discovery sessions, select
Enable unnamed discovery sessions .
- When enabled,
iSCSI initiators are not required to specify the target IQN to retrieve
the controller's information.
- When disabled,
discovery sessions are prevented unless the initiator provides the
target IQN. Disabling unnamed discovery sessions provides added security.
- Click Save .
What happens
next?
A progress bar appears as
System Manager attempts to register the controller with the iSNS server. This
process might take up to five minutes.