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7
C H A P T E R
2
Underlying Concepts and Practices
This chapter provides a brief overview of important concepts and practices that
underlie the configurations you can use. These concepts and practices are described
in greater detail in other books in the Sun StorEdge 3000 family documentation set.
Refer to
“Related Documentation” on page
Fibre Channel Protocols
The Sun StorEdge 3510 FC array and Sun StorEdge 3511 SATA array support point-
to-point and Fibre Channel–Arbitrated Loops (FC–AL) protocols. Using the point-to-
point protocol with Sun StorEdge 3510 FC arrays and Sun StorEdge 3511 SATA
arrays requires a switched fabric network (SAN), whereas selecting the FC-AL
protocol enables the arrays to be used in either DAS or SAN environments. Using
the point-to-point protocol enables full-duplex use of the available channel
bandwidth, whereas using the FC-AL protocol limits host channels to half-duplex
communication.
In a point-to-point configuration, only one ID can be assigned to each host channel.
If more than one ID is assigned, the point-to-point protocol rules are violated. Any
host channel with more than one ID will not be able to log into an FC switch in
fabric mode. This “one-ID-per-channel” requirement is true in both single-controller
and dual-controller configurations. Thus, in dual-controller configurations, either the
primary or the secondary controller can have an ID assigned, but not both. This
yields:
4 (host channels) x 1 (ID per channel) x 32 (LUNs per ID) = 128 maximum
addressable LUNs in a fabric point-to-point environment. If dual paths are
desired for each logical device, a maximum of 64 dual-pathed LUNs are available.
In an FC-AL configuration, multiple IDs can be assigned to any given host channel.
The maximum number of storage partitions that can be mapped to a RAID array is
1024.
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