Manage LUNs

	Concepts		Procedures		More Information

The Manage LUNs page enables you to perform the following management tasks:

• Adding (creating) a LUN

• Modifying LUN characteristics, such as changing the size of a LUN, taking a LUN offline, or bringing a LUN online

• Viewing a LUN map

• Mapping and unmapping a LUN

• Modifying a LUN ID

• Viewing LUN status and size

• Changing the status of a LUN

• Deleting a LUN

About managing LUN maps

To support a large number of hosts and to enforce access control, Data ONTAP maintains a separate map for each initiator group. This map controls which LUN is accessible to a given initiator group at a given LUN ID.

After you create a LUN, you must map it to the specific initiator group for it to be accessible to the hosts in that initiator group. Use the following guidelines when mapping LUNs:

• You can map two different LUNs to the same LUN ID for two different initiator groups without having a conflict.

• You can map a LUN only once to an initiator group.

• You cannot map two LUNs to an initiator group at the same LUN ID.

About mapping a LUN to an initiator group

The LUN ID is mapped to the initiators (hosts) in the initiator group. You can specify a LUN ID or you can use the number automatically assigned by Data ONTAP, which begins with 0 and increments by 1 every time a new LUN ID needs to be assigned. Network Appliance recommends that you allow Data ONTAP to automatically assign LUN IDs.