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Chapter 1
Product and Architecture Overview
1-7
1.4.2
FC Topologies
The presence or lack of switches establishes the topology of an FC environment. In a
direct attached storage (DAS) topology, servers connect straight to arrays without
switches. In a storage area network (SAN) topology, servers and arrays connect to an
FC network created and managed by switches.
Refer to
Sun StorEdge 3000 Family Best Practices Manual
for your array to see
information about optimal configurations for site requirements.
1.4.3
Fibre Hubs and Switches
A storage network built on a Fibre Channel architecture might employ several of the
following components: Fibre Channel host adapters, hubs, Fabric switches, and
fibre-to-SCSI bridges.
■
Fibre hubs
. An arbitrated loop hub is a wiring concentrator. “Arbitrated” means
that all nodes communicating over this fibre loop are sharing a 100 megabits per
second (Mbps) segment. Whenever more devices are added to a single segment,
the bandwidth available to each node is further divided.
A loop configuration allows different devices in the loop to be configured in a
token ring style. With a fibre hub, a fibre loop can be rearranged in a star-like
configuration because the hub itself contains port bypass circuitry that forms an
internal loop inside. Bypass circuits can automatically reconfigure the loop once a
device is removed or added without disrupting the physical connection to other
devices.
■
Fabric switches
. A Fabric switch functions as a routing engine, which actively
directs data transfer from source to destination and arbitrates every connection.
Bandwidth per node via a Fabric switch remains constant when more nodes are
added, and a node on a switch port uses an up-to-100-Mbps data path to send or
receive data.
1.4.4
Data Availability
Data availability is one of the major requirements for today’s mission-critical
applications. Highest availability can be accomplished with the following
functionality:
■
Hot-plug capabilities.
With proper hardware and software configuration in dual-
controller mode, a failed controller can be replaced online while the existing
controller is actively serving I/O.
■
Dual-loop configurations.
Dual loop provides path redundancy and greater
throughput.
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