Displaying iSCSI Targets

This help page provides information about iSCSI Targets and how and when to use them.  It contains the following topics: .

•  Overview

•  iSCSI Initiators and Targets

•  Displaying iSCSI Target Information

•  The iSCSI Targets Tab

•  Showing iSCSI Target Properties

•  Creating a Target

•  Editing a Target

•  Editing Authentication

•  Initializing Target 000

•  The iSCSI Target Security Tab

•  Changing iSCSI Target Security

•  The Hosts Tab

•  Changing a Nickname

•  The CHAP Users Tab

•  Deleting a CHAP User

•  Editing a CHAP User

•  Deleting a CHAP User

Overview   (back to top)

An iSCSI target is a logical entity that associates a group of hosts and logical units in the array.  

The Hitachi Simple Modular Storage system is an iSCSI storage device. iSCSI (pronounced ”r;eye skuzzy”) is an IP-based protocol that leverages the low cost and familiarity of Ethernet and IP networking.   iSCSI links data storage devices over standard Ethernet-based TCP/IP networks using small computer system interface (SCSI) commands. Because iSCSI uses the standard Ethernet infrastructure to provide access to storage ”r;targets,” it is compatible with, and can connect directly to, standard Gigabit Ethernet switches and IP routers. In this way, iSCSI enables low-cost storage access through the mature and predominant Ethernet infrastructure.

iSCSI Initiators and Targets

iSCSI defines a SCSI encapsulation protocol across a TCP/IP connection. As with SCSI, there are two types of components in an iSCSI system: initiators and targets.

An iSCSI initiator is a hardware device such as an iSCSI host bus adapter (HBA) or TCP/IP offload engine (TOE) and/or software installed in a server. The iSCSI initiator is the source of iSCSI commands that are sent over the network to the target. As such, it is responsible for:

• Originating iSCSI requests for target discovery and target connection.

• Creating the iSCSI packets.

• Handling transmission of the packets and corresponding responses using TCP/IP.

An iSCSI target is a device that receives iSCSI requests originating from an iSCSI initiator. Typically, the target is a drive contained in a storage device such as a Hitachi Simple Modular Storage system.

The following steps describe the sequence followed by the iSCSI initiator and target when establishing a ”r;session.”

1. The iSCSI initiator starts a TCP session with a target and tries to log in by sending a list of log-in parameters.

2. The initiator and target may insist on authenticating each other with one of several authentication methods (described next), depending on the system's configuration.

3. After passing the authentication stage, the initiator and target negotiate operating parameters, after which SCSI commands and data can pass between them

Displaying iSCSI Target Information   (back to top)

You can refer / configure groups (logical resources) in the array:

1. In the Arrays window, select the array you want to manage.

2. In the Explorer tree, click Groups. The Groups window is displayed.

3. In the Groups window, click iSCSI Target in the list of Groups. 

Note: iSCSI Targets is not displayed if the Array does not have iSCSI interface to communicate with hosts.

The iSCSI Targets Tab   (back to top)

This tab has the list of the iSCSI targets in the array.

Showing iSCSI Target Properties    (back to top)

To view the details of an iSCSI Target, click its name.

See the help page iSCSI Target Properties.

Creating a Target   (back to top)

To create one or more iSCSI targets on iSCSI Port(s):

1. In the iSCSI Targets window, the iSCSI Targets tab is displayed by default.  if it is not displayed, click the tab to display it.

2. Click Create Target. The Create iSCSI Target dialog box is displayed.

3. In the Create Target dialog box:enter the Number, Alias, and iSCSI Name of the target.

4. Select one or more iSCSI Ports that the iSCSI target belongs to.

NOTE: The Available Ports list is a list of iSCSI Ports where iSCSI Target Security is enabled.

5. The Create iSCSI Target window, includes three tabs: Hosts tab, Logical Units tab, and Settings tab.  These are described below.

The Hosts tab

Note: If the LUN Manager storage feature is not installed or enabled in the array, this tab is not displayed.

Check Select from Detected Hosts and select host(s) in the Detected Hosts list (This is the list of hosts that has tried to the iSCSI Port. The iSCSI names of those hosts are recorded in the array and you need not type manually.), or check Enter iSCSI Name Manually and type iSCSI Name in the iSCSI Name field.  Then click Add to assign the host(s) to the iSCSI target.  To de-assign host(s), select hosts from Selected Hosts list and click Remove button.

The  Logical Units tab

Note:The following operation is called ”r;set LU mapping”, or ”r;map LU to iSCSI targets.”

Select an H-LUN in H-LUN list, LUN(s) in Available LUs list and click Add button. In the Selected LUs list, LUN of logical unit is to be seen as H-LUN from the hosts allowed to access to the iSCSI target. Thus the logical unit in the array is mapped to H-LUN. If you remove the selected logical unit from the Selected LUs list, click the of  the logical unit in the Selected LUs list and click Remove button.

The Options tab

Select the platform and middleware of the host(s) by selecting pull-down menus to the left of Platform and Middleware.

Select the setting of host connection mode by the pull-down menu of Common Settings or es to the items of Additional Setting against host commands.

6. After finishing the settings of the iSCSI target, click OK to configure the iSCSI Target in the array.  After the creation, you can modify the settings by Edit Target button in.

Editing a Target   (back to top)

Note: As shown on the tool tip, the name of this button is an abbreviation of Edit iSCSI Target.

To edit the configuration of an iSCSI target:

1. In the iSCSI Targets tab of iSCSI Targets window, click of the iSCSI Target and click Edit Target. The Edit iSCSI Target window is displayed.

Note: This button is the same as the Target button in the iSCSI Target Property window.

In the Edit Target Window:

1. Enter the Number, Alias, and iSCSI Name of the target.

2. Select one or more iSCSI Ports that the iSCSI target belongs to.

Note: The Available Ports list is a list of iSCSI Ports where iSCSI Target Security is enabled. If LUN Manager is not enabled, iSCSI ports cannot select in this list.

3. The Create iSCSI Target window, includes three tabs for settings: Hosts tab, Logical Units tab, and Settings tab.  These are described below.

The Hosts tab

The Logical Units tab

(The following operation is called as ”reset LU mapping”, or ”remap LU to iSCSI targets.”)

1. Select an H-LUN in H-LUN list, LUN(s) in Available LUs list and click Add.

2. In the Selected LUs list, LUN of logical unit is to be seen as H-LUN from the hosts allowed to access to the iSCSI target. Therefore, the logical unit in the array is mapped to H-LUN.

3. To remove the selected logical unit from the Selected LUs list, click the of  the logical unit in the Selected LUs list and click Remove button.

The Options tab

1. Select the platform and middleware of the host(s) by selecting the pull-down menus to the left of Platform and Middleware.

2. Select the setting of host connection mode by the pull-down menu of Common Settings or es to the items of Advanced Setting.

4. After finishing the settings of the iSCSI target, click OK to configure the iSCSI Target in the array.  After the creation, you can modify the settings by Edit Target button in.

Editing  Authentication   (back to top)

To edit the authentication setting of an iSCSI Target:

1. In the iSCSI Targets tab of iSCSI Targets window, click the iSCSI Target and click Edit Authentication button. The Edit Authentication window is displayed.

NOTE: This button is the same as the Edit Authentication button in the Authentication tab of the iSCSI Target Property window.

In the Edit Authentication window:

1. Select the authentication method.  If you select either ”CHAP, None” or ”CHAP” you will need to associate CHAP Users to the iSCSI Target. This is done in the CHAP Users tab in the iSCSI Targets window.  The array can verify the user (of the host trying to access the iSCSI target) by the User Name and Secret of the CHAP user.

2. As desired, enable mutual authentication.  If you enable this function, the input authentication setting is for the iSCSI target.  If enabled, the host can verify the iSCSI target by the User Name and Secret of the iSCSI target.

Initializing Target 000   (back to top)

As shown on the tool tip, this button is abbreviation of Initialize iSCSI Target 000. Each iSCSI port has iSCSI Target 000 by default. You cannot delete iSCSI Target 000 but can initialize iSCSI Target 000.

To initialize one or more iSCSI Target 000 on iSCSI Port(s):

1. In the iSCSI Targets window, the iSCSI Targets tab is displayed by default.  if it is not displayed, click the tab to display it.

2. In the iSCSI tab, click the next to the name iSCSI Target 000 and click Initialize Target 000 . The Initialize iSCSI Target 000 window is displayed.

Deleting a Target   (back to top)

As shown on the tool tip, this button is abbreviation of Delete iSCSI Target. You cannot delete iSCSI Target 000.

The iSCSI Target Security Tab   (back to top)

If the LUN Manager (option program) is not installed or enabled in the array, this tab is not displayed.

To create iSCSI Target on an iSCSI port:

• LUN Manager must be installed and enabled, and 

• iSCSI target security must be enabled on the iSCSI port.

The iSCSI Target Security tab includes a list showing the configuration of the iSCSI ports on iSCSI target security configurations.

Changing iSCSI Target Security   (back to top)

To change the setting of the iSCSI target security on an iSCSI port:

1. In the iSCSI Targets window, select the iSCSI Target Security tab.

2. In the iSCSI Security tab, select an iSCSI port by clicking the to the left of its name.

3. Click Change iSCSI Target Security..  The Change iSCSI Target Security dialog box is displayed.

4. In the window, click the to set or reset iSCSI Target Security for the selected iSCSI port.

The Hosts Tab   (back to top)

If the LUN Manager (option program) is not installed or enabled in the array, this tab is not displayed.

This has the list of the hosts that are assigned to an iSCSI target or that are able to associated to an iSCSI target.

Changing a Nickname   (back to top)

The function cannot executed when LUN Manager (option program) is disabled.

To set a new nickname to a host or change the nickname of a host:

In Hosts tab of iSCSI Targets window, select the host by of the most left in the list of hosts and click Change Nickname . Change Nickname window is displayed. Enter new nickname of the host. A nickname of a host should be 32 or less alphanumeric characters. The nickname is used only on this navigator and not set to the hosts nor arrays.

This button is the same to Change Nickname button in the iSCSI Target Property window.

The CHAP Users Tab   (back to top)

This tab displays the list of the CHAP (Challenge Authentication Handshake Protocol) users of the hosts.

Showing CHAP User Details   (back to top)

To refer the detail configuration of a CHAP user, in CHAP Users tab of iSCSI Targets window,  click the of the CHAP User that you want to look at details and click Show Details.

Creating a CHAP User   (back to top)

To register a new CHAP user, in CHAP Users tab of iSCSI Targets window, click Create CHAP User button. Create CHAP User window is displayed. Enter the User name, type Secret and retype Secret. Click one or more to the left of the Port (iSCSI Port) where you want to create the CHAP user in the Available Port list.

Notes:

• For some environment of the host communicating by iSCSI, CHAP user is not related the actual user and the user name is the same to the iSCSI name of the host.

• Create CHAP User just register a CHAP user to one or more iSCSI Ports.  It is necessary to assign iSCSI target to the CHAP user to authenticate the host that tries to communicate with the target with the user name and the secret of the CHAP user.  So, after creating a CHAP user, click the of the CHAP user in the CHAP user list and click Edit CHAP User button to assign iSCSI targets to the CHAP user.

To view the details of the CHAP user you create, click the of the CHAP user and click Show Details button in the CHAP User list.

Editing a CHAP User   (back to top)

• To register a new user, select the check box of the CHAP User that you want to configure and click Edit CHAP User button.

• To change the user name of the CHAP user, overwrite the user name to User Name field.

• To change secret of the CHAP user, click the to the right to Change Secret, type a new secret to Secret field and retype the new secret to Retype Secret  field.

• Assign target to the CHAP user

To view the details of the CHAP user you edit, click the of the CHAP user and click Show Details button in the CHAP User list.

Deleting a CHAP User

To delete CHAP Users, click the of the CHAP Users that you want to delete and click Delete CHAP User button.

See Also   (back to top)

The following topics within this online help provide information that may be helpful in understanding the information on this page, and/or may provide additional information that is related, but not required to understand this topic.

  Settings

  iSCSI Settings

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