HP StorageWorks 2/8-EL quickloop fabric assist version 3.0.x user guide - Page 21

QuickLoop Topology, AL_PA devices.

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Using Quick Loop To use a QuickLoop telnet command, log into the relevant switch with administrative privileges, enter the command along with any required operands, and press Enter. For a description of all the telnet commands provided for managing QuickLoop, refer to the Fabric Operating System Reference Guide. QuickLoop Topology QuickLoop topologies have the following characteristics: ■ A QuickLoop can include up to two switches and can support up to 126 AL_PA devices. ■ Each switch can only be included in one QuickLoop. ■ A QuickLoop can include either all of, or a subset of, the ports on an individual switch. ■ Multiple non-overlapping QuickLoops can exist in a fabric of multiple switches. ■ Switches with QuickLoops enabled can exist in the same fabric as non-QuickLoop enabled switches. ■ A device attached to a QuickLoop can communicate with all other devices attached to the same QuickLoop. ■ A private device in a QuickLoop can only communicate with devices in the same QuickLoop. Existing PLDA capable host drivers need no modification to perform I/O operations with storage devices. ■ Public devices that are arbitrated loop capable are treated as private devices when connected to QuickLoop ports (their fabric login, or "FLOGI," is not valid). ■ Legacy devices may be used in a QuickLoop and may be attached to a fabric and operate as if in a PLDA environment. ■ A QuickLoop can be enabled or disabled for either the entire switch or for individual ports. When QuickLoop is disabled on an individual port, that port returns to Fabric mode. ■ Each looplet in a QuickLoop has its own unshared bandwidth and can support transfer rates up to 100 MB/s. Quickloop Fabric Assist User Guide 21

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Using Quick Loop
21
Quickloop Fabric Assist User Guide
To use a QuickLoop telnet command, log into the relevant switch with
administrative privileges, enter the command along with any required operands,
and press
Enter
.
For a description of all the telnet commands provided for managing QuickLoop,
refer to the
Fabric Operating System Reference Guide
.
QuickLoop Topology
QuickLoop topologies have the following characteristics:
■
A QuickLoop can include up to two switches and can support up to 126
AL_PA devices.
■
Each switch can only be included in one QuickLoop.
■
A QuickLoop can include either all of, or a subset of, the ports on an
individual switch.
■
Multiple non-overlapping QuickLoops can exist in a fabric of multiple
switches.
■
Switches with QuickLoops enabled can exist in the same fabric as
non-QuickLoop enabled switches.
■
A device attached to a QuickLoop can communicate with all other devices
attached to the same QuickLoop.
■
A private device in a QuickLoop can only communicate with devices in the
same QuickLoop. Existing PLDA capable host drivers need no modification
to perform I/O operations with storage devices.
■
Public devices that are arbitrated loop capable are treated as private devices
when connected to QuickLoop ports (their fabric login, or “FLOGI,” is not
valid).
■
Legacy devices may be used in a QuickLoop and may be attached to a fabric
and operate as if in a PLDA environment.
■
A QuickLoop can be enabled or disabled for either the entire switch or for
individual ports. When QuickLoop is disabled on an individual port, that port
returns to Fabric mode.
■
Each looplet in a QuickLoop has its own unshared bandwidth and can support
transfer rates up to 100 MB/s.