ATTO Technology VT-Class manual Zones, Principles of Zoning, Device portion defines the LUNs

device_lun

host_name

7.3 Zones

Zoning is a collection of related Diamond-VT capabilities supporting flexible Diamond configuration management configurable via CLI commands in the Command Line Interface mode or in the Advanced CLI Configuration page in the ExpressNAV interface. Zoning supports security by granting or denying access between initiators and devices as defined by an administrator.

A zone is a collection of devices which can access each other. The devices in a zone usually include one or more initiators, one or more devices, and one or more paths between the initiators and the devices.

To set up zones, use the Command Line Interface (see Accessing the Diamond-VT on page 15) or the Advanced CLI page in the ExpressNAV interface. Zone CLI commands only take effect after you enter the ZoneCommit command.

The individual elements are referred to as device_lun, host_name, port_number and zone_name as defined in Exhibit 7.3-1.

Exhibit 7.3-1 Definitions of zone configuration entries.

device_lun	The LUN of the RAID drive
host_name	In a Fibre Channel environment, the
	WWPN; in a SCSI environment, SCSI
	Initiator ID
port_number	The Diamond port number (0, 1) for the
	data path
zone_name	Alphanumeric or ‘_’, character string less
	than or equal to 16 characters long

Principles of Zoning

Zoning provides a validation filter for each SCSI command.

Each zone entry includes a named zone, a host portion, a port portion and a device portion. The components of a valid path from a host to a device satisfy the following conjunction:

<host_name> AND <port_list> AND device_list>

The zone is named to identify it from other zones. It appears as zone_name in this manual. The host portion defines the valid access path from a host through a port to a device (LUN), representing the Initiator ID in a SCSI

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environment or the World Wide Port Name in a Fibre Channel environment. It appears as

in this manual.

The device portion defines the LUN(s)

participating in the zone. It appears as in this manual.

The port portion defines the Fibre Channel or SCSI port in the Diamond-VT. It appears as port_n in this manual.

The process: Each command received by the Diamond-VT is parsed to determine its host/HBA identifier, its port number and the target LUN, forming the zone nexus. This zone nexus is looked up in the defined zones table. If the zone nexus is present, the operation continues; if it is not found, the command is rejected with the appropriate status and sense data.

Two zone configurations accessed through the Command Line Interface regulate zoning:

The Planned configuration is a work-in-process

configuration used to build or edit the desired configuration. The Planned configuration does not control I/O access until it is transformed into the Active Zone Configuration via successful completion of the ZoneCommit command.

Other than as a site for zone configuration editing, the Planned configuration has no impact on the Active configuration or the Diamond-VT. Changes to the Planned configuration may be made without considering synchronization with other configuration commands.

Use the ZoneClearAll command to clear the Planned configuration.

If, while working in the Planned configuration, you decide you want to negate that configuration and edit the Active configuration, use the ZoneRetrieve command. The information from

ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual