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Sun StorEdge 3000 Family Installation, Operation, and Service Manual • March 2004
Subsequent chapters in this manual describe further procedures used to complete
the installation and configuration of FC arrays. The flexible architecture of the Sun
StorEdge 3510 FC Array makes many configurations possible.
5.1
Controller Defaults and Limitations
This section describes default configurations and certain controller limitations.
5.1.1
Planning for Reliability, Availability, and
Serviceability
The entry-level configuration for an FC array uses only one controller. You can
mirror two single-controller arrays using volume manager software on attached
servers to ensure high reliability, availability, and serviceability (RAS).
You can also use dual-controller arrays to avoid a single point of failure. A dual-
controller FC array features a default active-to-active controller configuration. This
configuration provides high reliability and high availability because, in the unlikely
event of a controller failure, the array automatically fails over to a second controller,
resulting in no interruption of data flow.
Other dual-controller configurations can be used as well. For instance, at a site
where maximum throughput or connecting to the largest possible number of servers
is of primary importance, you could use a high-performance configuration. Refer to
the
Sun StorEdge 3000 Family Best Practices Manual
for the Sun StorEdge 3510 FC
Array for information about array configurations.
Be aware, however, that departing from a high-availability configuration can result
in a significant decrease in the mean time between data interruptions. System
downtime, however, is not affected as severely. The time required to replace a
controller, if one is available, is only about five minutes.
Regardless of configuration, customers requiring high availability should stock field-
replaceable units (FRUs), such as disk drives and controllers, on site. Your FC array
has been designed to make replacing these FRUs easy and fast.
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