Galaxy Metal Gear 65 Understanding LUNs and Viewing LUN Information, To view LUN information

Configuring Galaxy 65

6Select the option or number you want and press Enter. The CAPI LUN screen displays.

7Select the option or number you want to use.

There is just one CAPI LUN for each SM module. The system confirms that you want to make the change.

8Select Yes and press Enter to make the changes.

G.4 Understanding LUNs and Viewing LUN Information

Each SM module supports up to 64 FC logical unit numbers (LUNs), or 128 after a failover, that are numbered zero through 63. There are three different types of LUNs: CAPI, EMP, and partition. You can view information about each LUN. See G.4.1, ”Viewing LUN Information”, on page 197.

The three types of LUNs have the following characteristics:

•CAPI LUN: Allows CAPI to configure the SM module. Each Galaxy 65 can have a CAPI LUN. You only need to assign a CAPI LUN if you are using CAPI to configure the Galaxy 65 over a host channel using SCSI protocol extensions. If you are not using CAPI, you can set the CAPI LUN to NONE. If you are using CAPI, you can set it to a value of 0-63. For more information about changing the CAPI LUN, see G.3, ”Configuring the Host Channels”, on page 195.

Note: Most UNIX, Linux, and Macintosh operating systems require that the CAPI LUN be set to a higher value than all array LUNs. Before creating your first array, change the CAPI LUN to a higher value. If you are using a custom software application to configure and manage the controller (this application uses CAPI to communicate with the controller), you must have a CAPI LUN. If you are not using a custom application, and therefore are not using CAPI, select NONE as the CAPI LUN. This allows your first array to be seen at LUN 0.

•EMP LUNs: Allow access to EMPs. You can set an EMP LUN to a value of 0-63 or NONE. NONE means that the EMP cannot be accessed via a LUN. For information about changing the EMP LUN, see F.2.1, ”Setting the EMP LUN”, on page 184.

•Partition LUNs: Allow access to partitions on the SM module. You can set partition LUNs to any numeric value from 0-63. For information about changing the partition LUN, see C.3.5, ”Changing a Partition LUN”, on page 141.

G.4.1 Viewing LUN Information

You can view information for each existing LUN.

To view LUN information:

1From the System Menu, select Utilities Menu and press Enter. The Utilities Menu displays.

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