Modifying host systems

Complete this task to modify the parameters, such as the nickname or WWPN, that were specified for established host systems.

1. In the navigation, select Real-time manager or Simulated manager > Manage hardware > Host systems. In Host Systems — Main Page, select a host from the table.
2. Select Modify... from the Select Action drop-down list. Then click Go. The Modify Host System — General host information page is displayed.
3. In the General host information page, you can modify the nickname and optionally provide a description. Then click Next.
4. In the Define host ports page, you can specify the quantity and type. You must select a host port in the Defined host ports table before moving to the next step. The following list presents potential modifications and the resulting actions:
   • You can add another host attachment by specifying the Quantity and Type. Optionally, you can select Group ports to share a common set of volumes to share a common set of volumes. If this box is checked by the user, the quantity of ports identified in the Quantity field above becomes grouped together and treated as a single host attachment.
   • You can select an existing host port from the Defined host ports table and then select the Remove button. The related fields on the left side of the page populate with the information that was just removed. If you want to modify any of those fields, then select the Add button; the new host attachment is added to the Defined host ports table. If you want to remove it all together, just proceed through the wizard.
   Note: If you remove a host attachment, the volume group assigned to the attachment is no longer accessed by the host attachment. In other words, all previously defined storage unit association (storage unit ports and volume group) with this host attachment is lost.
5. When you are finished in the Define host ports page, click OK. The Modify Host System — Define host WWPN page is displayed.
6. In the Define host WWPN page, you can modify the host port WWPN for open systems hosts. Then click OK. The Modify Host Systems — Specify storage units page is displayed.
   Note: To add a host, select Add entry form from the drop down list, enter a 16-digit WWPN and then click the Add button. You can add or modify the WWPN for each included host port.
7. In the Specify storage units page, you can add or remove any of the storage units in the Available storage units or the Selected storage units boxes.
   • If you add storage units, you must complete the Specify storage unit parameters page for each newly added storage unit.
   • If you remove storage units, all of the associations between the host attachment and the storage unit (storage unit ports and volume group) are lost.
8. When you are finished in the Specify storage units page, click Next. The Modify Host Systems — Specify storage unit parameters page is displayed.
9. In the Specify storage unit parameters page, you can modify parameter values. The Apply assignment button commits the current transaction. If you select an existing host attachment from the Select host attachment identifiers table, you can:
   • Select another volume group for the host attachment by choosing from the Select volume group for host attachment drop-down box.
   • Specify what the host attachment can login to. The Any valid storage unit I/O port selection enables this host attachment to login to any of the available storage unit ports. If you select The following specific storage unit I/O ports, then you must specify the storage unit I/O ports from the Available storage unit I/O ports table. You can optionally check the View recommended box to see the recommended storage unit port assignments displayed in the table. You can also optionally select the Configure I/O Ports.. button and follow the process for configuring an existing I/O port. Once you have completed that process by clicking on the Finish button, the changed I/O port is available for selection in the Select column.
   • Select the Create new group button to create a new group for selection.
   Note: If you select a new host attachment that was added in the Modify Host Systems — Define host ports page, you must proceed as you would in the create wizard mode.
10. When you are finished in the Specify storage unit parameters page, click Apply assignment, then OK. The Modify Host Systems — Verification page is displayed.
11. In the Verification page, review the modified attributes and values to verify that they are correct.
12. If the attributes and values are not correct, click Back as appropriate to return and then specify the correct values. Otherwise, click Finish to complete the host system modification process.