The volumes on your ReadyNAS can be divided into shares and logical unit numbers (LUNs), both of which are logical entities on one or more disks. Shares and LUNs enable you to organize data in a volume by type, group, user, department, and so on. A single volume can contain multiple shares and LUNs.
LUNs are SAN (storage area network) data sets that allow data transfer and storage over iSCSI and Fibre Channel devices. The ReadyNAS supports iSCSI devices only. Each ReadyNAS system supports up to 256 LUNs. The local admin page displays LUNs in the following way:
Each LUN is configured independently of other LUNs that reside on the same volume. You can configure settings such as compression, protection, provisioning, LUN size, and access rights. You can also specify whether and how often a snapshot is created. These settings are explained in the following sections.