HP StorageWorks 8B - FC Entry Switch Manual del usuario - Página 10

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Introducing QuickLoop

QuickLoop provides a possible migration path starting with deploying a single private loop and

later deploying a fabric-based SAN. In this scenario, QuickLoop-enabled switches can be used to

replace hubs when the SAN is first deployed and has only private devices attached. Then, as the

SAN grows, fabric switches can be added without any detrimental effect to the QuickLoop-enabled

switches.

Address Translation

Address translation is transparent and requires no actions on the part of the user. It is achieved

through hardware translative mode (also known as phantom mode), in which a device not

physically located in a looplet is made addressable by a unique AL_PA in that looplet.

There are two hardware translative modes available to a QuickLoop-enabled switch:

•

Standard translative mode

Allows public hosts to communicate with private target devices across the fabric. Standard

translative mode is available as an integral part of Fabric OS, and does not require QuickLoop.

•

QuickLoop mode

Allows private hosts to communicate with private target devices across the fabric when

configured in the same QuickLoop. Also allows private host to communicate with public target

in the same QuickLoop.

In mixed mode individual ports within a switch are set by configuration commands to one of the

above two modes.

The switch automatically determines and sets the appropriate mode, based on factory defaults and

configurations currently in effect.

QuickLoop can be used in conjunction with Zoning.

In addition to zoning fabrics, QuickLoop Zoning also allows you to zone QuickLoops, enhancing

management of a Fibre Channel Arbitrated Loop (FC-AL) in a legacy environment.

In QuickLoop Zoning, devices within a QuickLoop can be partitioned off within that QuickLoop to

form QuickLoop zones; in other words, a QuickLoop zone is a subset of QuickLoop and can

include only devices in QuickLoop.

Fabric zones and QuickLoop zones are independent of each other; both types of zones can co-exist

in the same zone configuration. Hosts in a QuickLoop can see only targets contained within a

QuickLoop.

Zoning adds the following features:

•

Devices from multiple QuickLoops can be added to the definition for a fabric zone.

Even an identical AL_PA from two different QuickLoops could be configured under a fabric

zone. Zoning can correctly direct traffic to the different devices.

•

Additional control over access to QuickLoop devices.

Fabric devices in a zoned fabric can only access the QuickLoop (and fabric) devices that are in

the same zone.

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QuickLoop User's Guide