Chapter 1: Cabling Concepts and Best Practices 15
Host Cabling for
Redundancy
To ensure that, in the event of a host channel failure, the storage array will stay
accessible to the host, establish two physical paths from each host to the controllers,
and install alternate path software on the host. This cabling topology, when used with
alternate path software, makes sure that a redundant path exists from the host to the
controllers.
ATTENTION Possible loss of data access – You must install alternate path software
or an alternate path (failover) driver on the host to support failover in the event of an
HBA failure or a host channel failure.
For examples of redundant topologies, see the topics under "Host Connection" on
page 39.
Host Cabling for
Synchronous
Mirroring
The Synchronous Mirroring premium feature provides online, real-time replication of
data between storage arrays over a remote distance. In the event of a disaster or a
catastrophic failure at one storage array, you can promote a second storage array to
take over responsibility for computing services. See the topics under "Hardware
Installation for Synchronous Mirroring" on page 189 for detailed information about
connecting for Synchronous Mirroring.
The Synchronous Mirroring premium feature requires a dedicated host port for
mirroring data between storage arrays. After the Synchronous Mirroring premium
feature has been activated, one host I/O port on each controller is solely dedicated to
mirroring operations.
NOTE One of the host ports on each controller must be dedicated for the
communication that occurs between the two storage arrays (primary volumes and
secondary volumes). If you are not using the Synchronous Mirroring premium feature,
these host ports are available for ordinary host connections.
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