HP StorageWorks 2.128 SAN Director Switch - Manual (Page 178)

178 Administering advanced zoning
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 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 Host-based zoning can implement WWN or LUN masking.
Fabric-based 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 .