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that any transceiver you use meets the FC performance and reliability
specifications.
NOTE:
SFP transceiver modules must be purchased separately. You can order
the field-replaceable, SFP tranceivers from your subsystem vendor or
contact them for a compatible list.
4.2 Topology and Configuration Considerations
4.2.1 Basic Configuration Rules
When you are configuring your GALAXY Raid, the list below contains
some basic rules that should be followed.
NOTE:
Please adhere to these basic configuration rules. They are provided for
your convenience to ensure that your storage system will run smoothly
and effectively.
•
When selecting the number of hard drives that should be connected
through the drive channels, the transfer rates and the mechanical
performance of the hard disks should be considered.
•
When cabling, follow all the Fibre channel specifications. Pay
attention to signal quality and avoid electronic noise from adjacent
interfaces.
•
The drives in the same logical array should have the same capacity,
but it is preferred that all the drives have the same capacity.
•
A spare drive should have a minimum capacity that is equivalent to
the largest drive that it is expected to replace. If the capacity of the
spare is less than the capacity of the drive it is expected to replace,
then the controller will not proceed with the failed drive rebuild.
4.2.2 Fibre Channel Topologies
The Fibre channel standard supports three (3) separate topologies. They are
point-to-point, Fibre Channel Arbitrated Loop (FC-AL), and fabric switch
topologies.
•
Point-to-Point: Point-to-point topology is the simplest topology
that can be used. It is a direct connection between two (2) Fibre
channel devices.
Topology and Configuration Considerations
Chapter 4: Subsystem Connection and Operation
4-3
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