HP A7533A HP StorageWorks Fabric OS 5.X Procedures User Guide (AA-RVHWB-TE, Se - Page 178
Zoning concepts, Zone types, Table 33 Types of zoning
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To list the commands associated with zoning, use the zoneHelp command. For detailed information on the zoning commands used in the procedures, see the HP StorageWorks Fabric OS 5.x command reference guide or to the online man page for each command. Zoning concepts Before using the procedures, become familiar with the zoning concepts described in the following sections. Zone types Table 33 summarizes the types of zoning. Table 33 Types of zoning Zone type Description Storage-based Host-based Fabric-based Storage units typically implement logical unit number (LUN)-based zoning, also called LUN masking. LUN-based zoning limits access to the LUNs on the storage port to the specific WWN of the server HBA. It is needed in most SANs. It functions during the probe portion of the SCSI initialization. The server probes the storage port for a list of available LUNs and their properties. The storage system compares the WWN of the requesting HBA to the defined zone list, and returns the LUNs assigned to the WWN. Other LUNs on the storage port are not made available to the server. Host-based zoning can implement WWN or LUN masking. Fabric switches implement fabric-based zoning, in which the zone members are identified by WWN or port location in the fabric. Fabric-based zoning is also called name server-based or soft zoning. HP StorageWorks switches might also provide additional hardware enforcement of the zone. When a device queries the fabric Name Server, the Name Server determines the zones in which the device belongs. The server returns information on all members of the zones in the fabric to the device. Devices in the zone are identified by node WWN, port WWN, or domain, port of the switch to which the device is connected. Fabric-based zoning is perhaps the most controversial aspect of zoning. There are several approaches for implementing fabric zoning; all of them work in most cases. However, there are pros and cons to each form. The primary forms are summarized in Table 34. 178 Administering advanced zoning